AL1692-20CS7-13

**AL1692** Cd **DIMMABLE LED CONTROLLER/DRIVERS** 

## **Description** 

The AL1692 is a high performance, high power factor, high efficiency, and high current precision buck-boost and flyback dimmable LED controller/drivers for triac dimmable LED lamp applications. The AL1692 topology provides an accurate output current over wide line and load regulation. The wide switching frequency operates at boundary conduction mode (BCM) to ease EMI/EMC design and testing, to meet the latest regulatory standards. 

The AL1692 controller with external MOSFET can support higher output power application, up to 25W. The AL1692 LED drivers have AL1692-30BA with 400V/3A and AL1692-20C with 600V/2A MOSFET. The AL1692 platform solutions can cover both 120Vac and 230Vac applications. The AL1692 has the built-in thermal fold-back protection trigger point to automatically reduce output current. Other protection features enhance LED lighting system's safety and reliability. 

## **Pin Assignments** 

**==> picture [229 x 109] intentionally omitted <==**

**----- Start of picture text -----**<br>
(Top View)<br>VCC [| 1 8 SW VCC [ 1 | [| 7 D<br>RT [| 2 7 NC RT [| 2<br>COMP [| 3 || 6 CS COMP [ 3 | [| 6 CS<br>GND [| 4 5 FB GND [ 4 | [| 5 FB<br>SO-8                                                    SO-7<br>**----- End of picture text -----**<br>


## **Applications** 

- Mains Dimmable LED Lamps 

- Offline LED Power Supply Driver 

The AL1692 dimming curve is compliant with the NEMA SSL6 standard. The AL1692 applies to a wide range of dimmers, including leading edge and trailing edge dimmer, to achieve deep dimming down to 1%. 

The AL1692 controller is available in SO-8 package. The Integrated MOSFET version AL1692-30BA and AL1692-20C are available in SO-7 package. 

## **Features** 

- Tight Current Sense Tolerance : ± 3% 

- Low Startup Current: 100µA Typical  Low Operation Current: 210µA (Switching Frequency at 4kHz)  Single Winding Inductor  Wide Range of Dimmer Compatibility 

- For Controller Power can Drive up to 25W 

- For MOSFET Options : 400V/3A and 600V/2A  NEMA SSL6 Dimming Curve Compliant  Internal Protections 

- Under Voltage Lockout (UVLO) 

- Leading-Edge Blanking (LEB)  Cycle-by-cycle Over Current Protection (OCP)  Output Open/Short Protection (OVP/OSP)  Thermal Foldback Protection (TFP)  Over-Temperature Protection (OTP) 

- SO-8 (Controller)  and SO-7 (With MOSFET) Package 

- **Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)** 

- **Halogen and Antimony Free. “Green” Device (Note 3** ) 

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. 

1 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

**Typical Application Circuits** 

**==> picture [423 x 604] intentionally omitted <==**

**----- Start of picture text -----**<br>
L1<br>R2 D3<br>FR1 R3 Q1<br>R10<br>AC<br>Input VCC 1 8 SW<br>DB1 R1 RT 2 7 NC<br>COMP CS<br>3 6<br>= C1 C2 C3 | C4 R6 GND 4 5 FB<br>C6 R5<br>D1<br>R4<br>; : ; a<br>R9<br>C5<br>L2 R7 LEDS<br>D2 R8 +<br>AL1692 Controller in Buck-Boost<br>L1<br>R2<br>FR1 R3<br>AC<br>Input VCC 1 7 D<br>DB1 R1 RT 2<br>COMP CS<br>3 6<br>cK” -<br>C1 C2 C3 C4 R6 GND 4 5 FB<br>C6 R5<br>D1<br>R4<br>R9<br>C5<br>L2 R7 LEDS<br>D2 R8 +<br>' nn it<br>AL1692-30BA/20C Integrated MOS Version in Buck-Boost<br>L1<br>R2 D3<br>FR1 R3 Q1<br>R10<br>AC<br>Input VCC 1 8 SW<br>DB1 R1 RT 2 7 NC<br>COMP CS<br>3 6<br>C1 C2 C3 C4 R6 C 6 GND 4 5 FB<br>R5<br>T1 D1<br>R4<br>R9 R11 C 7 R7 + C5 OUT<br>D2<br>R8 D4<br>CY<br>U1 AL1692<br>U1 AL1692<br>U1 AL1692<br>**----- End of picture text -----**<br>


AL1692 Controller in Fly-back 

2 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Pin Descriptions** 

**==> picture [382 x 469] intentionally omitted <==**

**----- Start of picture text -----**<br>
Pin Number<br>Pin Name  Function<br>SO-8  SO-7<br>1  1  VCC  Power Supply Voltage<br>2  2  RT  Resistor Set the System’S Maximum tON<br>3  3  COMP  Compensation for Current Control<br>4  4  GND  Ground<br>5  5  FB  Feedback for LED Open Protection Voltage<br>6  6  CS  Current Sensing<br>NC (SO-8) No Connected<br>7  7<br>D (SO-7) Drain of the Internal High Voltage MOSFET<br>8  --  SW  Source Driver of Switch<br>gramram<br>SW<br>VCC 1 8<br>STOP OFF<br>Management  Fault   UVLO ManagementVCC ClampVCC<br>OTP OVP<br>VDD VREF<br>2 tONS Detection<br>RT Set tON_max [(ZCD) ]<br>NC<br>tON_max VCC  7<br>Driver Supply<br>at S Clamp<br>R<br>Q<br>3<br>COMP - GM - Sample and Hold  CS<br>STOPtON_max + + VREF 6<br>OCP +<br>Sp e es - 1.6V t<br>VREF_OVP<br>GND 4 OVP OVP 5 FB<br>AL1692 Controller<br>**----- End of picture text -----**<br>


## **Functional Block Diagramram** 

3 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Functional Block Diagram** (Cont.) 

**==> picture [349 x 263] intentionally omitted <==**

**----- Start of picture text -----**<br>
D<br>VCC 1 7<br>VCC<br>Clamp<br>STOP OFF<br>Fault   VCC<br>Management   UVLO Management<br>OTP OVP<br>VDD VREF<br>2 tONS Detection<br>RT Set tON_max [(ZCD) ]<br>tON_max VCC<br>Driver Supply<br>a S Clamp<br>R<br>Q<br>3 6<br>COMP - GM - Sample and Hold  7 CS<br>STOPtON_max + + VREF<br>OCP +<br>- - 1.6V<br>VREF_OVP<br>GND 4 OVP OVP 5 FB<br>AL1692-30BA/20C with MOSFET<br>**----- End of picture text -----**<br>


4 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

**Absolute Maximum Ratings** (@TA = +25°C, unless otherwise specified.) (Note 4) 

|**Symbol**<br>~~ee~~|**Parameter**|**Rating**|**Unit**|
|---|---|---|---|
|VCC<br>~~ee~~<br>~~eG~~|Power Supply Voltage<br>~~eG~~|18<br>~~eG~~|V<br>~~eG~~|
|VSW<br>~~a~~|Voltage on SW Pin(AL1692) (Note 5)<br>~~a~~|20<br>~~a~~|V<br>~~a~~|
|VD<br>~~a~~<br>~~ee~~|Voltage on Drain Pin(AL1692-30BA)<br>~~a~~<br>~~ee~~|400<br>~~a~~<br>~~ee~~|V<br>~~a~~<br>~~ee~~|
||Voltage on Drain Pin(AL1692-20C)<br>~~ee~~|600<br>~~ee~~|V<br>~~ee~~|
|IDS<br>~~ee~~<br>~~HHH~~|Continuous Drain Current TC= +25°C (AL1692-30BA)<br>~~ee~~<br>~~HHH~~|3<br>~~ee~~<br>~~HHH~~|A<br>~~ee~~<br>~~HHH~~|
||Continuous Drain Current TC= +25°C (AL1692-20C)<br>~~HHH~~|2<br>~~HHH~~|A<br>~~HHH~~|
|VCS<br>~~fe~~|Voltage on CS Pin<br>~~fe~~|-0.3 to 7<br>~~fe~~|V<br>~~fe~~|
|VRT<br>~~fe~~|Voltage on RT Pin<br>~~fe~~|-0.3 to 7<br>~~fe~~|V<br>~~fe~~|
|VFB<br>~~Ce~~<br>~~es~~|Voltage on FB Pin<br>~~Ce~~|-0.3 to 7<br>~~Ce~~|V<br>~~Ce~~|
|TJ<br>~~es~~<br>~~es~~|Operating Junction Temperature|-40 to +150|°C|
|TSTG<br>~~es~~<br>~~es~~<br>~~———————————————~~|Storage Temperature<br>~~———————————————~~|-65 to +150<br>~~———————————————~~|°C<br>~~———————————————~~|
|TLEAD<br>~~es~~<br>~~———————————————~~|Lead Temperature (Soldering, 10 seconds)<br>~~———————————————~~|+260<br>~~———————————————~~|°C<br>~~———————————————~~|
|PD<br>~~———————————————~~<br>~~Se~~|SO-8 Power Dissipation (TA= +50°C) (Note 6)<br>~~———————————————~~<br>~~Se~~|0.96<br>~~———————————————~~<br>~~Se~~|W<br>~~———————————————~~<br>~~Se~~|
||SO-7 Power Dissipation (TA= +50°C) (Note 6)<br>~~———————————————~~<br>~~Se~~|0.8<br>~~———————————————~~<br>~~Se~~|W<br>~~———————————————~~<br>~~Se~~|
|JA<br>~~Se~~<br>~~Se~~|SO-8 Thermal Resistance(Junction to Ambient) (Note 6)<br>~~Se~~<br>~~Se~~|104<br>~~Se~~<br>~~Se~~|°C/W<br>~~Se~~<br>~~Se~~|
||SO-7 Thermal Resistance(Junction to Ambient) (Note 6)<br>~~Se~~|123<br>~~Se~~|°C/W<br>~~Se~~|
|JC<br>~~Se~~<br>~~SS~~<br>~~ee~~|SO-8 Thermal Resistance(Junction to Case) (Note 6)<br>~~Se~~<br>~~SS~~|6.6<br>~~Se~~|°C/W<br>~~Se~~|
||SO-7 Thermal Resistance(Junction to Case) (Note 6)<br>~~SS~~<br>~~_~~|19<br>~~—~~|°C/W<br>~~—~~|
|–<br>~~ee~~|ESD(Human BodyModel)<br>~~_~~|2,000<br>~~—~~|V<br>~~—~~|
||ESD(Machine Model)<br>~~_~~|200<br>~~—~~|V<br>~~—~~|



5. SW pin can withstand pulse voltage up to 25V with duration of 300ns. 

6. Device mounted on 1"x1" FR-4 substrate PCB, 2oz copper, with minimum recommended pad layout. 

## **Recommended Operating Conditions** (@TA = +25°C, unless otherwise specified.) 

|**Symbol**|**Parameter**|**Min**|**Max**|**Unit**|
|---|---|---|---|---|
|TA<br>Ambient Temperature (Note 7)|Ambient Temperature (Note 7)|-40|+105|°C|



- Note: 7. The device may operate normally at +125°C ambient temperature under the condition not trigger temperature protection. 

5 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

**Electrical Characteristics** (@TA = +25°C, unless otherwise specified.) 

|~~Se~~|~~Se~~|||||||
|---|---|---|---|---|---|---|---|
|**Symbol**<br>~~Se~~||**Parameter**<br>|**Condition**<br>|**Min**<br>|**Typ**<br>|**Max**<br>|**Unit**<br>|
|**UVLO**<br>~~Seee~~||||||||
|VTH (ST)<br>~~a~~||Startup Voltage<br>~~a~~|–<br>~~a~~|–<br>~~a~~|14.5<br>~~a~~|–<br>~~a~~|V<br>~~a~~|
|VOPR(Min)<br>~~a~~||Minimal Operating Voltage<br>~~a~~|After Turn On<br>~~a~~|–<br>~~a~~|8.5<br>~~a~~|–<br>~~a~~|V<br>~~a~~|
|VCC_CLAMP<br>~~a~~||VCCClamp Voltage<br>~~a~~|ICC= 1mA<br>~~a~~|–<br>~~a~~|15.5<br>~~a~~|–<br>~~a~~|V<br>~~a~~|
|**Standby Current**<br>~~ee~~<br>~~ee~~<br>~~es~~<br>~~eeGeee~~<br>~~es~~||||||||
|IST<br>~~ee~~<br>~~ee~~||Start-Up Current<br>~~es~~<br>~~re Rs~~|VCC= VTH (ST)-0.5V,<br>Before Start Up<br>~~ee~~<br>~~Rs~~|–<br>~~Ge~~|100<br>~~ee~~|–<br>~~es~~|µA|
|ICC (OPR)<br>~~ee~~<br>~~ee~~||Operating Current<br>~~es~~<br>~~re Rs~~|Switching Frequency<br>at 4kHz<br>~~ee ~~<br>~~Rs~~|–<br> ~~Ge ~~|210<br> ~~ee~~|–<br>~~es~~|µA|
|**Source Driver**<br>~~ee~~<br>~~re Rs~~<br>~~ee~~<br>~~ee~~<br>~~eeeeee~~<br>~~ee~~||||||||
|RDS(ON)LV<br>~~ee~~||Internal Low Voltage MOSFET On-<br>State Resistance(Note 8)<br>~~ee~~|–<br>~~ee~~|–<br>~~ee~~|1<br>~~ee~~|–<br>~~ee~~|Ω|
|**High Voltage and Super-Junction MOSFET**<br>~~ee~~<br>~~ee~~<br>~~ee ee ee~~<br>~~ee~~<br>~~ee ee~~||||||||
|RDS(ON)HV<br>~~ee~~||Drain-Source On-State Resistance<br>~~ee~~|AL1692-30BA<br>~~ee~~|–<br>~~ee ee~~|2.8<br>~~ee~~|3.4<br>~~ee~~|Ω<br>~~ee~~|
||||AL1692-20C<br>~~ee~~|–<br>~~ee ee~~|4<br>~~ee~~|5.5<br>~~ee~~|Ω<br>~~ee~~|
|VDS<br>~~ee~~<br>~~ee~~<br>~~ee ae~~||Drain-Source Breakdown Voltage<br>~~ee~~<br>~~ee~~<br>~~ae~~|AL1692-30BA<br>~~ee~~<br>~~ee~~|400<br>~~ee ee~~<br>~~ee~~|–<br>~~ee~~<br>~~ee~~|–<br>~~ee~~<br>~~ee~~|V<br>~~ee~~<br>~~ee~~|
||||AL1692-20C<br>~~ee~~<br>~~pees~~|600<br>~~ee~~<br>~~eee~~|–<br>~~ee~~<br>~~ee~~|–<br>~~ee~~<br>~~ee~~|V<br>~~ee~~<br>~~ee~~|
|IDSS<br>~~ee ae~~||Drain-Source Leakage Current<br>~~ae~~|AL1692-30BA<br>~~pees~~|–<br>~~eee~~|–<br>~~ee~~|1<br>~~ee~~|µA<br>~~ee~~|
||||AL1692-20C<br>~~pees~~|–<br>~~eee~~|–<br>~~ee~~|1<br>~~ee~~|µA<br>~~ee~~|
|**RT**<br>~~ee ae pees eee ee ee ee~~<br>~~yore~~||||||||
|VRT_REF<br>~~yore~~||Reference Voltage of RT pin<br>~~yore~~|–<br>~~yore~~|–<br>~~yore~~|0.5<br>~~yore~~|–<br>~~yore~~|V<br>~~yore~~|
|**Current Sense**<br>~~ee~~||||||||
|VCS_CLAMP<br>~~ee~~<br>~~ee~~||CS Clamp Voltage<br>~~ee~~<br>~~es~~|–<br>~~ee~~<br>~~es~~<br>~~Gr~~|–<br>~~ee~~<br>~~es~~<br>~~es~~|1.6<br>~~ee~~<br>~~es~~|–<br>~~ee~~<br>~~es~~|V<br>~~ee~~<br>~~es~~|
|VREF<br>~~ee~~||Internal Current Loop Control<br>Reference<br>~~es~~|–<br>~~es~~<br>~~Gr~~|0.388<br>~~es~~<br>~~es~~|0.4<br>~~es~~|0.412<br>~~es~~|V<br>~~es~~|
|tON_MIN<br>~~ee~~<br>~~o>~~<br>~~ee~~||Minimum tON<br>~~es~~<br>~~o>~~<br>~~es ee~~|–<br>~~es~~<br>~~Gr~~<br>~~o>~~<br>~~ee es~~|–<br>~~es~~<br>~~es~~<br>~~o>~~<br>~~es~~|550<br>~~es~~<br>~~o>~~<br>~~ee~~|–<br>~~es~~<br>~~o>~~<br>~~ee~~|ns<br>~~es~~<br>~~o>~~|
|tON_MAX<br>~~ee~~||Maximum tON<br>~~es ee~~|RT= 51kΩ, VCOMP=<br>4V<br>~~ee es~~|–<br>~~es~~|5.4<br>~~ee~~|–<br>~~ee~~|µs|
|tOFF_MIN<br>~~ee ~~<br>~~a~~||Minimum tOFF(Note 8)<br> ~~es ee~~|–<br>~~ee es~~|–<br>~~es ~~|4<br> ~~ee ~~|–<br> ~~ee~~|µs|
|tOFF_MAX<br>~~o>~~<br>~~ee~~||Maximum tOFF<br>~~o>~~|–<br>~~o>~~|–<br>~~o>~~|290<br>~~o>~~|–<br>~~o>~~|µs<br>~~o>~~|
|**FB**<br>~~ee~~||||||||
|VFB<br>~~ee~~<br>~~ee~~||Feedback Voltage<br>~~ss~~|–<br>~~ss~~|3.76<br>~~ss~~|4.0<br>~~ss~~|4.24<br>~~ss~~|V<br>~~ss~~|
|IFB<br>~~ee~~<br>~~ee~~||Feedback Pin Input Leakage<br>Current<br>~~ss~~|VFB= 2V<br>~~ss~~|–<br>~~ss~~|4<br>~~ss~~|–<br>~~ss~~|μA<br>~~ss~~|
|**Error Amplifier**<br>~~eess~~<br>~~gy~~<br>~~er~~||||||||
|GM<br>~~gy~~||Gm Trans-Conductance<br>~~gy~~|–<br>~~er~~|–<br>~~er~~|25<br>~~er~~|–<br>~~er~~|µA/V<br>~~er~~|
|ISOURCE<br>~~>~~||Amplifier Source Current<br>~~>~~|VCS= 0V<br>~~>~~|–<br>~~>~~|10<br>~~>~~|–<br>~~>~~|µA<br>~~>~~|
|ISINK<br>~~a~~||Amplifier Sink  Current<br>~~a~~|VCS=1.5V<br>~~a~~|–<br>~~a~~|28<br>~~a~~|–<br>~~a~~|µA<br>~~a~~|
|**Thermal Foldback and Over Temperature Protection (OTP)**<br>~~Ce~~||||||||
|TFOLD<br>~~a~~<br>~~SS~~|Thermal Foldback (Note 8)<br>~~a~~<br>~~SS~~||–<br>~~a~~|–<br>~~a~~|+145<br>~~a~~|–<br>~~a~~|°C<br>~~a~~|
|–<br>~~SS~~|Thermal Shutdown (Notes 8&9)<br>~~SS~~||–|–|+160|–|°C|



9. The device will latch off when OTP happens, recovered after power cycle and the device won’t operate normally at this temperature. 

6 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Performance Characteristics** (Note 10) 

**Start-up Voltage vs. Ambient Temperature                 Minimum Operating Voltage vs. Ambient Temperature** 

**==> picture [208 x 161] intentionally omitted <==**

**----- Start of picture text -----**<br>
16.0<br>15.5 P| | | [| | ft ft<br>15.0 P| | | | ft ff |<br>14.5<br>14.0 ee ee<br>13.5 P| | | | ft ff |<br>13.0 P| | | f ft ff |<br>12.5 P| | | | ft ff |<br>12.0 fF | | | ft ft ft ft ft<br>-40 -20 0 20 40 60 80 100 120<br>Ambient Temperature (oC)<br>Start-up Voltage (V)<br>**----- End of picture text -----**<br>


**==> picture [209 x 160] intentionally omitted <==**

**----- Start of picture text -----**<br>
10.0<br>9.5 P| | | ft ft ft ft<br>9.0 P| | | ft ft ft ft<br>8.5<br>8.0 oo<br>7.5 Pf | | | ft ft fd<br>7.0 P| | | | | ff ||<br>6.5 P| | | t ft | ft<br>6.0 P| | | | | ft ft ft<br>-40 -20 0 20 40 60 80 100 120<br>Ambient Temperature (oC)<br>Minimal Operating Voltage (V)<br>**----- End of picture text -----**<br>


## **Start-up Current vs. Ambient Temperature                           Operating Current vs. Ambient Temperature** 

**==> picture [457 x 365] intentionally omitted <==**

**----- Start of picture text -----**<br>
130 240<br>230<br>120 Pt P| | | | | | tf<br>tt TLL Yd 220 FEET<br>110 210<br>COPA Feet<br>200<br>100<br>PTeT 190 BRR<br>90 180<br>py | | | tt ee<br>170<br>80<br>rT TT tee 160 Ppp pp<br>70-40 Pt -20 ttt 0 20 40 60 ELL 80 100 I 120 150-40 PEELE -20 0 20 40 60 80 100 120<br>Ambient Temperature (oC) Ambient Temperature (oC)<br>VCC Clamp Voltage vs. Ambient Temperature                      Feedback voltage vs. Ambient Temperature<br>19.5 5.0<br>18.0 | 4.5 Pt | | tt tt<br>16.5 a<br>4.0<br>15.0 Pot | Et — nnn<br>3.5<br>13.512.0 PPPrPreeeelit 3.0 PTey ffTeet| |dd<br>10.5<br>2.5 EEE<br>9.0 PES] td<br>2.0<br>-40 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120<br>Ambient Temperature (oC) Ambient Temperature (oC)<br>  (V)<br>FB_OVP<br>V<br>VCC Clamp Voltage (V)<br>A)<br>Operating Current (<br>A)<br>Start-up Current (<br>**----- End of picture text -----**<br>


**VCC Clamp Voltage vs. Ambient Temperature                      Feedback voltage vs. Ambient Temperature** 

Note:        10. These electrical characteristics are tested under DC condition. The ambient temperature is equal to the junction temperature of the device. 

7 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Functional Description and Application Information** 

## **Operation** 

The AL1692 is a single stage, single winding, high efficiency, and high power factor dimmable LED driver controller/drivers for triac dimmable LED lamp applications.  The AL1692 controller with an external MOSFET can support larger power application up to 25W.  The AL1692 LED drivers: AL1692-30BA with 400V/3A and AL1692-20C with 600V/2A internal MOSFET options can cover both 120VAC and 230VAC application. 

The AL1692 adopts source-driver technique to decrease the system operating current. It uses a novel method to detect the tOFF time which results in the removal for the need of an auxiliary winding.  The AL1692 operates at boundary conduction mode (BCM) which can ease EMI design and achieve high efficiency. High power factor (HPF) is achieved by using constant on-time mode; coupled with a closed loop of constant current control, the AL1692 achieves good line and load regulation. 

## **Start-up and Supply Voltage** 

Before start-up, the VCC capacitor C4 is charged by the startup resistors (R2, R3) from the high voltage mains. When the start-up voltage is reached, the AL1692 starts switching. During normal operation, the VCC supply is provided by start-up resisters (R2, R3) and the output voltage (VOUT) rectified by one diode (D2). In this way the system can provide VCC supply at low dimming angle. 

The AL1692 has an internal VCC clamp voltage (typical 15.5V), which is limited by one internal active Zener diode. 

When VCC voltage drops to below the VOPR(MIN), switching is stop. So the device can operate normally when the voltage on VCC pin is between VOPR(MIN) and VCC clamp voltage. 

## **Protections** 

## **Under Voltage Lockout (UVLO)** 

When the voltage on the VCC pin drops to below VOPR(Min), the IC stops switching. The IC can restart when the voltage on VCC exceeds the startup voltage (VTH(ST)). 

## **Leading-Edge Blanking (LEB)** 

To prevent false detection of the peak current of the inductor, a blanking time following switch-on is designed. When the internal switch turns on, a short current spike can occur because of the capacitive discharge of the voltage over the drain and source. It is disregarded during the LEB time (tON_MIN). 

## **Cycle-by-cycle Over Current Protection (OCP)** 

The AL1692 has a built-in peak current detector. It triggers when the voltage on CS pin reaches the peak level VCS_CLAMP. The R5 is connected to the CS pin to sense the current of the inductor. The maximum peak current (IPEAK(MAX))of the inductor can be calculated as below: 

**==> picture [365 x 29] intentionally omitted <==**

The detection circuit is activated after the LEB time. When the detection circuit sense the CS voltage is higher than 1V, the IC will turn off the switching to limit the output current. It automatically provides protection for the maximum LED current during operation. A propagation delay exists between over current detection and actual source-switch off, so the actual peak current is a little higher than the OCP level set by the R5. 

## **Over-Voltage Protection and Output-Open Protection (OVP)** 

The output voltage is sensed by the FB pin, which provides an over-voltage protection (OVP) function. When the output is open or large transient happens, the output voltage will exceed the rated value (R8, R9). When the voltage exceeds VFB, the over-voltage is triggered and the IC will discharge VCC. When the VCC is below the UVLO threshold voltage, IC will restart and the VCC capacitor is charged again by start-up resistance. If the over voltage condition still exists, the system will work in hiccup mode. 

## **Output-Short Protection (OSP)** 

When LED is shorted, the device cannot detect the tOFF time, and the device controls the system operation at 4kHz low frequency. 

8 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Functional Description and Application Information** (Cont.) 

## **Thermal Foldback Protection (TFP)** 

AL1692 has a thermal foldback protection (TFP) function and adopts self-adaptive control method, which can prevent the system breaking down caused by high temperature. The overheating temperature is set at +145°C typical, when the junction temperature of the IC is higher than +145°C typical, the device will linearly decrease the internal reference voltage to decrease the output current. As a result of this feature, the device can control the system’s output power at high ambient temperature, to control the quantity of heat of the system. This enhances the safety of the system at high temperature. 

Thermal foldback waveform is shown below: 

**==> picture [317 x 140] intentionally omitted <==**

**----- Start of picture text -----**<br>
Output Current<br>100%<br>50%<br>TFOLD=145 OTP Junction Temperature/°C<br>**----- End of picture text -----**<br>


Figure 1. Thermal Foldback Waveform 

## **Over-Temperature Protection (OTP)** 

The AL1692 has over temperature protection (OTP) function. When the junction temperature reach to +160°C typical, the IC will trigger an overtemperature protection, which causes the device to shut down and latched condition.  Once OTP triggered, the system need to be resumed after the system’s AC source supply has been reset and power up. 

## **Design Parameters** 

## **Setting the Current Sense Resistor R5** 

The AL1692 adopts boundary conduction mode, the output current is calculated as below, 

**==> picture [354 x 30] intentionally omitted <==**

Where, 

IPEAK is the peak current of the inductance 

tON is the internal MOSFET on time 

tOFF is the freewheel diode D1 conduction time 

tDELAY is typical 0.4µs 

The AL1692 is a closed loop constant current control with the relationship between output current and current sense voltage follows this equation 

**==> picture [353 x 29] intentionally omitted <==**

Where, 

VREF is the internal reference, typical 0.4V. 

R5 is the current sense resistor 

So we can get the output current equation as below, 

**==> picture [357 x 27] intentionally omitted <==**

9 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Functional Description and Application Information** (Cont.) 

## **Inductance Selection (L2)** 

In buck-boost structure, the peak current of the inductance can be calculated as below 

**==> picture [377 x 75] intentionally omitted <==**

**----- Start of picture text -----**<br>
I PEAK  oe R 5   0 sin(  )  Tr 2  2 V  IN  VV _ REFINRMS _ RMS  sin(  sin(  )  ) Vo d                           ……………………  (5)<br>Where,<br>VIN_RMS is the input voltage’s RMS value<br>**----- End of picture text -----**<br>


VO is the system output voltage 

The AL1692 controls the system operating at boundary conduction mode which results in its operating frequency not being constant. To set the minimum switching frequency fMIN at the crest of the minimum AC input. 

**==> picture [353 x 34] intentionally omitted <==**

According to the Faraday’s Law, the winding number of the inductance can be calculated by: 

**==> picture [355 x 29] intentionally omitted <==**

Where, 

Ae is the core effective area. 

Bm is the maximum magnetic flux density. 

## **tON_MAX Setting** 

In order to get a good dimmer compatibility and a good dimming depth, the device sets a tON_MAX by one external resistor RT (R6). And the tON_MAX time has the below equation: 

**==> picture [353 x 47] intentionally omitted <==**

Where 

VRT_REF is the internal RT pin 0.5V’s reference. 

CREF is the internal 1.5pF capacitor. 

## **Dimming Control** 

The AL1692 is a closed loop control device; the dimming function is realized by tON_MAX limited when dimmer is connected in. When the dimmer is at the largest conduction angle, the device still has the adjustability to control the output current constant before COMP voltage is adjusted to the maximum 4V, so for most of the dimmer, the output current is almost the same with the no dimmer condition at the largest conduction angle. If the conduction angle is decreased, the COMP pin voltage will continue to increase quickly till to the maximum level (typical 4V), the device will output tON_MAX  to limit system’s output current. The tON_MAX is set by RT pin connected with one resistor, so the dimming depth can be adjusted by RT resistor (R6). 

Before the AL1692 enters tON_MAX mode, it keeps the output current constant the same as no dimmer condition. When enter tON_MAX mode, we can get the following equation: 

**==> picture [125 x 20] intentionally omitted <==**

…………………… (9) 

10 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Functional Description and Application Information** (Cont.) 

From the buck-boost output current equation, we can get the output current when dimming: 

**==> picture [377 x 85] intentionally omitted <==**

**==> picture [336 x 145] intentionally omitted <==**

**----- Start of picture text -----**<br>
Output Current (%)<br>100<br>tON<tON_MAX<br>tON=tON_MAX<br>0<br>0 Critical Conduction Angle 180<br>Conduction Angle    (deg) <br>**----- End of picture text -----**<br>


Figure.2 Dimming Curve 

## **Dimmer Compatibility** 

## **Passive Bleeder Design** 

The passive bleeder is designed to supply latching and holding current to eliminate dimmer misfire and flicker. 

**==> picture [275 x 148] intentionally omitted <==**

**----- Start of picture text -----**<br>
L1 Passive<br>Damping<br>Bleeder<br>FR1<br>L DB1 R1<br>C1<br>C2<br>N<br>=e|<br>Figure.3 LED Driver Schematic with Passive Bleeder<br>**----- End of picture text -----**<br>


The passive bleeder includes a capacitor (C2, in hundreds of nF) to provide latching current. A resistor (R1) is necessary to dampen the current spike. Because a large C2 will affect the PF, THD and efficiency, the value of the capacitor (C2) should be selected accordingly. Generally, 100nF/400V to 330nF/400V is recommended. R1 is used to limit the latching current, If R1 is too large, the latching current is not enough and the TRIAC dimmer will misfire causing LED flicker. If R1 is too small, it will result in greater power dissipation. Generally speaking, a 200Ω to 2KΩ resistor is selected for R1. 

## **Passive Damping Design** 

FR1 is the damper for reducing the spike current caused by quick charging of C2 at firing. In General, FR1 is selected from 20Ω to 100Ω for low line like 120VAC application, and 51Ω to 200Ω for high line like 230VAC application. 

11 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Ordering Information** 

## **AL1692-X X X** – **X** 

Current Option MOSFET Voltage Package Packing 20 : 2.0A BA:  400V S7 : SO-7 13: Tape & Reel 30 ： 3.0A C:    600V S: SO-8 Blank: AL1692 Blank: AL1692 

|**Part Number**|**Package Code**|**Package**|**13” Tape and Reel**|**13” Tape and Reel**|
|---|---|---|---|---|
||||**Quantity**|**Part Number Suffix**|
|AL1692S-13|S|SO-8|4000/Tape & Reel|-13|
|AL1692-30BAS7-13|S7|SO-7|4000/Tape & Reel|-13|
|AL1692-20CS7-13|S7|SO-7|4000/Tape & Reel|-13|



## **Marking Information** 

## **SO-8** 

**(Top View)** 8 7 6 5 (tifl tf Logo YY : Year : 15,16,17~ Part Number **AL1692** WW : Week : 01~52; 52 represents 52 and 53 week **YY WW X X** ~~-~~ X X : Internal Code 1 2 3 4 ooo 

## **SO-7** 

## **(Top View)** 

| 7 [|_| 6 5 Logo YY : Year : 15,16,17 ~ Part Number **1692 - ZZZZ** WW : Week : 01~52; 52 1692-30BA for 3.0A/400V represents 52 and 53 week **YY WW X X** 1692-20C for 2.0A/600V X X : Internal Code 1 2 3 4 

12 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Package Outline Dimensions** (All dimensions in mm.) 

Please see http://www.diodes.com/package-outlines.html for the latest version. 

## **(1) Package Type: SO-8** 

**==> picture [445 x 169] intentionally omitted <==**

**----- Start of picture text -----**<br>
SO-8<br>Dim  Min  Max  Typ<br>A  1.40  1.50  1.45<br>| Ht + n_4 | E |||J A1  {[[|[| 0.10  [{[{[{[| 0.20  |{[| 0.15  |<br>b  0.30  0.50  0.40<br>1 ee c  0.15  0.25  0.20<br>D  4.85  4.95  4.90<br>THA A > E  5.90  6.10  6.00<br>b E1  3.80  3.90  3.85<br>E1 | | ft<br>h E0  3.85 3.95 3.90<br>Q e  --  --  1.27<br>7 ] 7° c e h  e ee -  eee --  0.35<br>A 4°± 3° L   0.62  0.82  0.72<br>G auge Plane Q 0.60  0.70  0.65<br>l L S eating Plane | All Dimensions in mm<br>e A1 E0<br>D<br>9° (All sides)<br>R 0.1<br>45°<br>**----- End of picture text -----**<br>


## **(2) Package Type: SO-7** 

**==> picture [333 x 270] intentionally omitted <==**

**----- Start of picture text -----**<br>
5.800(0.228)<br>1.350(0.053)<br>6.200(0.244) 1.750(0.069)<br>0.330(0.013 )<br>0.510(0.020 )<br>2.54(0.100)<br>TYP 4.700(0.185)<br>5.100(0.201)<br>1.270(0.050)<br>TYP<br>0.080(0.003)<br>0.250(0.010)<br>3.800(0.150) 1.250(0.049)<br>4.000(0.157) 1.500(0.059)<br>0.350(0.014)<br>TYP<br>45°<br>0.450(0.017) 0.150(0.006)<br>Option 1 0.800(0.031) 0.250(0.010)<br>Option 2<br>0 °<br>8 °<br>**----- End of picture text -----**<br>


Note: Eject hole, oriented hole and mold mark is optional. 

13 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **Suggested Pad Layout** 

Please see http://www.diodes.com/package-outlines.html for the latest version. 

## **(1) Package Type: SO-8** 

**==> picture [149 x 175] intentionally omitted <==**

**----- Start of picture text -----**<br>
podoc X1<br>Y1<br>Y<br>a<br>UOT: C X<br>**----- End of picture text -----**<br>


**==> picture [103 x 55] intentionally omitted <==**

**----- Start of picture text -----**<br>
Dimensions Value (in mm)<br>C 1.27<br>X  0.802<br>X1  4.612<br>Y  1.505<br>Y1  6.50<br>**----- End of picture text -----**<br>


## **(2) Package Type: SO-7** 

**==> picture [164 x 196] intentionally omitted <==**

**----- Start of picture text -----**<br>
G Z<br>E1<br>Y<br>E X<br>i<br>**----- End of picture text -----**<br>


|Dimensions|Z<br>(mm)/(inch)|G<br>(mm)/(inch)|X<br>(mm)/(inch)|Y<br>(mm)/(inch)|E<br>(mm)/(inch)|E1<br>(mm)/(inch)|
|---|---|---|---|---|---|---|
|Value|6.900/0.272|3.900/0.154|0.650/0.026|1.500/0.059|1.270/0.050|2.540/0.100|



14 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated 

**AL1692** 

## **IMPORTANT NOTICE** 

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. 

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. 

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. 

This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. 

## **LIFE SUPPORT** 

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: 

- A.   Life support devices or systems are devices or systems which: 

   1. are intended to implant into the body, or 

   2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. 

B.   A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. 

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. 

Copyright © 2017, Diodes Incorporated 

**www.diodes.com** 

15 of 15 **www.diodes.com** 

AL1692 Document number: DS39008 Rev. 2 - 2 

September 2017 © Diodes Incorporated