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| AMC7150 Reference Design AMC7150 - 1.5A Power LED Driver Content 1. 2. 3. 4. 5. 6. 7. AMC7150 EVM User Guide Application of AMC7150 @ VIN=12VDC Application of AMC7150 @ VIN=24VDC Application of AMC7150 for MR16 PWM Dimming Function of AMC7150 Thermal Issue of AMC7150: Temperature vs. Current Relationship between VIN and the LED Driving Current Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com DA011 September 1, 2006 AMC7150 1. AMC7150 EVM User Guide 1.1. Circuit Scheme: DC-IN Jack D1 Rsen L J2 J1 DF LED1 4 1 VCC CS OUT VIN CIN + AMC7150 OSC GND LED2 CT 1.2. Picture: (Rsen) Set LED Peak Current Test Point DC-IN Jack (J1) Mode Selection (D1) Reverse Protection Diode Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 1-1 DA011 September 1, 2006 AMC7150 1.3. Description: 1 DC-IN: DC power jack. It is designed to provide convenience for demo. Simply one adapter is needed for supplying the EVM board to light up the Power LEDs. 2 D1: Reverse protection diode. It is located between input port of the EVM, VIN, and Vcc pin of the IC. The function is to provide protection when input source is reverse connected. 3 J1: Lighting mode selection connector. Four lighting modes of the 2 LEDs can be accomplished through jumper. The 2 LEDs can be connected in series or parallel, or either of the 2 LEDs can be selected. The method of selecting one of these modes is shown in the following table. Table Method of using jumper to select 1 of the 4 lighting modes for the 2 LEDs. Mode 1 2 3 4 Lighting condition of LED1 and LED2 LED1&LED2 connected in serial LED1&LED2 connected in parallel LED1 LED2 1 1 1 1 J1 2 2 2 2 3 3 3 3 4 4 4 4 4 J2: Test point. It is reserved for current measurement to make sure that the LED driving current matches the value calculated by the formula below (Please refer to the datasheet for the calculated method of the average current): I PK = 330mV 10% Rsense 1.4. Reference PCB Layout: Top Layer Bottom Layer Large PCB area is reserved for GND plane and is connected to the heat pad of AMC7150. The GND plane can be a part of heat sink for AMC7150. Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com DA011 September 1, 2006 1-2 AMC7150 2. Application of AMC7150 @ VIN=12VDC 2.1. V IN =12V DC for 1pcs of Power LED: A. Circuit Diagram: B. Bill of Material: Component AMC7150 CIN CT RSENSE DF L 47uF / 16V 680~820pF 0.87 1N5819 220uH Value Package TO-252-5L E. C. Cap. DIP / SMD 0603 DIP / SMD 1206 DO-41 (Axial Lead) - Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 2-1 DA011 September 1, 2006 AMC7150 2.2. V IN =12V DC for 2pcs of Power LED in Series: A. Circuit Diagram: B. Bill of Material: Component AMC7150 CIN CT RSENSE DF L 47uF / 16V 680~820pF 0.83 1N5819 220H Value Package TO-252-5L E. C. Cap. DIP / SMD 0603 DIP / SMD 1206 DO-41 (Axial Lead) - Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 2-2 DA011 September 1, 2006 AMC7150 2.3. V IN =12V DC for 3pcs of Power LED in Parallel: A. Circuit Diagram: B. Bill of Material: Component AMC7150 CIN CT RSENSE DF L - Value 47uF / 16V 680~820pF 0.92 1N5819 220uH Package TO-252-5L E. C. Cap. DIP / SMD 0603 DIP / SMD 1206 DO-41 (Axial Lead) - Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 2-3 DA011 September 1, 2006 AMC7150 3. Application of AMC7150 @ VIN=24VDC 3.1. V IN =24V DC for 2pcs of Power LED in Series: A. Circuit Diagram: B. Bill of Material: Component AMC7150 CIN CT RSENSE DF L - Value 47uF / 35V 680~820pF 0.83 1N5819 220uH Package TO-252-5L E. C. Cap. DIP / SMD 0603 DIP / SMD 1206 DO-41 (Axial Lead) - Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 3-1 DA011 September 1, 2006 AMC7150 3.2 V IN =24V DC for 3pcs of Power LED in Series: A. Circuit Diagram: B. Bill of Material: Component AMC7150 CIN CT RSENSE DF L - Value 47uF / 35V 680~820pF 0.8 1N5819 220uH Package TO-252-5L E. C. Cap. DIP / SMD 0603 DIP / SMD 1206 DO-41 (Axial Lead) - Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 3-2 DA011 September 1, 2006 AMC7150 4. Application of AMC7150 for MR16 4.1. Application Circuit of AMC7150 for MR16 (VIN=12VAC): L Rsense D1 D2 VCC 12Vac CIN D4 D3 OSC CS OUT DF Power LED AMC7150 GND CT 4.2. Bill of Material: C. R. No. PCB IC CIN D1~D4 DF RSENSE L1 CT Q'TY 1 1 1 4 1 1 1 1 Value 47~100uF/25V FM140-M FM140-M 0.22~3 220uH 680~820pF AMC7150 Description PCB12V Ballast Solution 7150 for MR-16 Tantalum Chip Cap. Schottky Diode40V/2A Schottky Diode40V/2A SMD 0603 IDC=0.4 ~ 1.2A SMD 0603 Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 4-1 DA011 September 1, 2006 AMC7150 5. PWM Dimming Function of AMC7150 5.1 Application Circuit L 4V~40V Rsense VCC 1N4148 CS OUT DF Power LED Enable CIN CT OSC AMC7150 GND 5.2 Description of Enable Control One diode (1N4148) is added between the inward PWM control signal and the OSC pin. Parameter Enable voltage "High" Enable voltage "Low" Enable voltage sink current Description Turn OFF the driver Turn ON the driver Turn OFF the driver Symbol VEN,H VEN,L IEN Min 2 Max 5.5 0.4 300 Unit V V uA Enable Apply Pin 5.3 Measured Waveform When ON duty=100%, iLED,Mean =369mA ON duty = 9.3%, iLED,Mean =30.2mA ON duty = 91.7%, iLED,Mean =342mA Ch1: iLED, Ch3: Enable Ch1: iLED, Ch3: Enable Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 5-1 DA011 September 1, 2006 AMC7150 6. Thermal Issue of AMC7150: Temperature vs. Current AMC7150 can work well under ambient temperature from -40 to +125. Put the AMC7150 EVM board into the programmable chamber to simulate the extreme temperature environment, the AMC7150 EVM board can work well, as the measured waveforms of LED current and the oscillating waveform of CT shown in the following table: Table AMC7150 EVM can work well under ambient temperature from -40 to +125. Ambient Temperature Measured waveforms Test condition CH1iL CH2CT Vcc=12V Room Temperature Rsen=0.5 L=180uH LED=1pcs CT=820pF Vf,LED=3.34V CH1iL CH2CT Low Temperature -40 Vcc=12V Rsen=0.5 L=180uH LED=1pcs CT=820pF Vf,LED=3.626V CH1iL CH2CT High Temperature +125 Vcc=12V Rsen=0.5 L=180uH LED=1pcs CT=820pF Vf,LED =3.2V Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 6-1 DA011 September 1, 2006 AMC7150 7. Relationship between VIN and the LED Driving Current When VIN changes, the RMS value of LED driving current will change slightly. Vin vs I(LED,RMS) 420 LED Driving Current (mA) 400 380 360 340 320 300 6 8 10 12 Vin (V) 14 16 18 20 di 381 mA - 357 mA = = 6 mA V dv 12 V - 8V VIN=8~12V % V = V = 1.57 % V 381mA 6 mA di 396 mA - 381 mA = = 3 . 75 mA V dv 16 V - 12 V VIN=12~16V % V = 3 . 75 mA 381 mA V = 0 . 98 % V Copyright (c) 2006, ADDtek Corp. http://www.addmtek.com 7-1 DA011 September 1, 2006 |
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