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230VAC Triac Dimmable GU10 LED Driver AP1694AEV11 Rev2 Page 2 of 10 July 2015 www.diodes.com WHY USE DIODES TAPPED TRANSFORM STRUCTURE The traditional Buck converter turn on time is inverse proportion with input voltage. Vo = D x Vin. The duty cycle will be getting smaller when the input voltage goes higher. Example: Vo=12V, Vin= 120VAC, Fs= 75kHz. D= Vo/Vin * = 12V/120V * 1.414 = 0.07 Ton=D/Fs = 0.07/ 75kHz =0.933µs. T=1/Fs =13.33µs Since the Ton time is too short in the duty cycle; therefore there is not enough current passing through the LEDs and charging the inductor. In result, it caused the efficiency to be lower. In order to solve this issue ‐ use the Diodes tapped transformer to boost the output current & increase the Ton time in the duty cycle. With the “new tapped” transformer, the Duty cycle will be: D is original duty cycle = Vo/Vin*1.414, n = NA+Np/NA & L = Lp + LA, Vo/Vin = D’/(D’ +n(1‐D’)), If N A=40Ts, Np=100Ts, n=3.5 D’ = nVo/(Vin+(n‐1)Vo) = 0.21 The duty cycle almost increased by 3 times. The Efficiency will increase about 4 to 5% (before the Efficiency was about 72% now is 77%) comparing with the “none tapped” transformer.

230VAC Triac Dimmable GU10 LED Driver AP1694AEV11 Rev2 Page 3 of 10 July 2015 www.diodes.com DIODES TAPPED TRANSFORMER DESIGN AP1694A 230VAC Buck tapped 12V 400mA Transformer Spec 1) Bobbin EEP10 4+4 pin WD2: Primary 30#*1, 60Ts 6 2 WD1: Primary WD3: Auxiliary 36#1, 111Ts 36#*1, 1 2 0 Ts 7 5 2) Transformer Parameters 1. Primary Inductance (Pin1‐Pin7, all other windings are open) Lp = 1.5mH ± 5%@1kHz 2. Primary Winding Turns: NP=120Ts (Pin7‐Pin6) + 60Ts (Pin 6 to Pin 1) 3. Auxiliary Winding Turns (Pin2‐ Pin5): NA= 111Ts (Pin 2 to Pin 5) 3) Transformer Winding Construction Diagram Winding Number Windings Winding Specification WD1‐Primary Winding Start at Pin 7, wind 120 turns of single Φ34# wire and finish on Pin 6. WD2‐Primary Winding Start at Pin 6, wind 60 turns of single Φ30# wire and finish on Pin 1.

2 Insulation 2 Layers of insulation tape

WD3‐Auxiliary Winding Start at Pin 2, wind 111 turns of single Φ36# wire and finish on Pin 5.

4 Insulation 2 Layers of insulation tape

230VAC Triac Dimmable GU10 LED Driver AP1694AEV11 Rev2 Page 5 of 10 July 2015 www.diodes.com Bill of Material # Name QTY Part number Manufacturer Description

1 U1 1 AP1694AS‐13 Diodes Inc LED Driver, SO7

2 T1 1 EL1004R Elite Electronics EE10, Transformer

3 BD1 1 HD06‐T Diodes Inc Bridge Rectifiers 0.8A 600V

4 D1 1 DFLF1800‐7 Diodes Inc Rectifier 1A/800V

5 D2 1 B1100B Diodes Inc Rectifier 1A/100V

6 D3 1 MMSZ5250B‐7‐F Diodes Inc Zener Diode, 20V

7 F1 1 C1Q1 Bel Fuse Fuse, 1A/125V

8 Q1 1 AOU3N60 Alpha Omega MOSFET N‐CH 600V 3A IPAK

9 Q2 1 FMMT458 Diodes Inc MOSFET N‐CH 400V 0.2A SOT‐23 10 L1 1 LPS6235‐565MRB Coilcraft 5.6mH/150mA C1A, C1B, C2 3 C1210X104K501T Holystone CAP CER 1210 0.1µF 500V X7R

12 C3 1 GMK316BJ106KL‐T Taiyo Yuden CAP CER 10µF 35V X5R 1206

13 C4 1 EEU‐FR1E331B Panasonic CAP 330µF/25V (8 x 13mm)

14 C6 1 C1206X0683K501T Holystone CAP CER 1206 0.068µF 500V X7R 15 R1 1 RC0805FR‐077K5L Yageo America RES 7.5KΩ 1/8W 1% 0805 SMD

16 R2 1 FMP100JR‐52‐330 Yageo America RES 330Ω 1W 5% FMP100

17 R3A, R3B 2 9T12062A4703FBHFT Yageo America RES 470KΩ 1/8W 1% 1206 SMD

18 R4 1 RC1206FR‐075K1L Yageo America RES 5.1KΩ 1/8W 1% 1206 SMD 19 R5 1 RC0805FR‐0715KL Yageo America RES 15.0KΩ 1/8W 1% 0805 SMD

20 R6 1 RC0805JR‐0722RL Yageo America RES 22Ω 1/8W 1% 0805 SMD

21 R7 1 RC0805FR‐0711KL Yageo America RES 11.0KΩ 1/8W 1% 0805 SMD

22 R8 1 RC0805FR‐0756KL Yageo America RES 75KΩ 1/8W 1% 0805 SMD

23 R9 1 RC0805FR‐071K5L Yageo America RES 1.5KΩ 1/8W 1% 0805 SMD 24 R10, R11 2 MCR10ERTFL4R02 Rohm RES 4.02Ω 1/8W 1% 0805 SMD 25 R12 1 RC1206FR‐075K1L Yageo America RES 5.1KΩ 1/8W 1% 1206 SMD

26 R13 1 RC0805FR‐0730K0L Yageo America RES 30KΩ 1/8W 1% 0805 SMD

27 R14 1 RC0603JR‐0710KL Yageo America RES 10KΩ 1/8W 1% 0603 SMD

28 Rf 1 FMP100JR‐52‐680 Yageo America RES 68Ω 1W 1% FMP

29 Rm 1 MOV‐07D431KTR Bournes MOV, 275VAC

230VAC Triac Dimmable GU10 LED Driver AP1694AEV11 Rev2 Page 8 of 10 July 2015 www.diodes.com AP1694AEV11 with Panasonic 230VAC dimmer test data 230VAC Dimmer Vin (VAC) V after dimmer Arms (mA) Pin(W) PFC (in) THD(%) Vout (V) Iled (mA) Pout (W) Eff (%) Dimming range (%) Flicker? Panasonic (Model # WMS549, 400W) 230VAC Note: = No Flicker EMC test result Conductive emission noise level (Pass with 15db margin)

230VAC Triac Dimmable GU10 LED Driver AP1694AEV11 Rev2 Page 9 of 10 July 2015 www.diodes.com Radiated emission noise level (Pass, please zoom in to see the green mark) Note: Green color data are after VQP, will be 5db down than normal

230VAC Triac Dimmable GU10 LED Driver AP1694AEV11 Rev2 Page 10 of 10 July 2015 www.diodes.com IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KI ND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPL IED 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 de scribed herein; neither does Diodes Incorpora ted convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or pr oducts 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 what soever in respect of any prod ucts purchased through unauthorized sales channel. Should Customers purchase or use Diodes In corporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and it s representatives harmless against all cl aims, damages, expenses, and attorney fee s 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 mu ltiple languages for reference. Only the English version of t his document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifica lly not authorized for use as critical co mponents 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 dev ice or system whose failure to perform can be reasonably expect ed 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 dev ices or systems, and acknowledge and agree that they are solely respon sible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such sa fety-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 repres entatives against any damages aris ing out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2015, Diodes Incorporated www.diodes.com