AL3159 Evaluation Module HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER Device Features Description • • • The AL3159 is a low noise, constant frequency charge pump DC/DC converter that uses a dualmode load switch (1x), and (2x) conversion for white LED applications. The AL3159 is capable of driving three groups of three LED channels at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple logic control inputs individually or in parallel for driving higher current LEDs. Low external part counts (one 1μF flying capacitor and two 2.2μF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. • • • • • • • • • • • VIN Range: 2.7V to 5.5V Up to 93% Max Power Efficiency 1% Current Matching Accuracy Between Channels Three Simple Logic Decoding LED On/Off Control Inputs Low Transition Threshold Voltage Typical 150 mV Dual-Mode 1x and 2x Charge Pump Drives up to 9 Configurable Channels of LEDs 1.2 MHz Constant Switching Frequency VOUT short circuit and Thermal Protections Soft Start for Reducing Inrush Current Under Voltage Lockout Protection IQ <1μA in Shutdown Thermally-Enhanced QFN3030-20 Package: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant This evaluation board uses the AL3159’s three digital inputs to enable and disable the WLED channels. Each input controls three WLEDs. The digital signals are generated by an on-board microcontroller. Ordering Information Device Package Code Packaging EVM Part Number AL3159FSG FS DFN3030-20 AL3159FSG-EVM Rev.1 AL3159FSG-EVM Rev.1 1 of 5 www.diodes.com SEPTEMBER 2010 © Diodes Incorporated AL3159 Evaluation Module HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER Schematic AL3159FSG-EVM Rev.1 2 of 5 www.diodes.com SEPTEMBER 2010 © Diodes Incorporated AL3159 Evaluation Module HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER PCB Layout Top Layer Layout of AL3159FSG-EVM Rev.1 Bottom Layer Layout of AL3159FSG-EVM Rev.1 AL3159FSG-EVM Rev.1 3 of 5 www.diodes.com SEPTEMBER 2010 © Diodes Incorporated AL3159 Evaluation Module HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER Bill of Material Bill of Material for AL3159FSG-EVM Rev.1 Ref C1, C3 C2 C4 C5 LED1-9 LED10 LED11 JP1-9 JP10 R1-3 R4-5, 7-9 R6 R10-12 U1 U2 Count Size Mfr 2 0603 STD 1 0603 STD 1 1210 STD 1 0805 STD 9 0805 STD 1 0805 STD 1 0805 STD 9 0603 STD 1 0803 STD 1 0603 STD 5 0603 STD 1 0603 STD 3 0603 STD DFN3030-20 Diodes 1 0 1 QFN6060-28 Microchip Part Number STD STD STD STD STD STD STD STD STD STD STD STD STD AL3159SFG PIC16F1827 Description 2.2 µF/10V ceramic capacitor 1 µF/16V ceramic capacitor 10 µF/10 ceramic capacitor 1 µF/10V ceramic capacitor White LED Green LED Red LED 0 Ω resistor 0 Ω resistor Not populated 1 kΩ resistor 10 kΩ resistor 100 kΩ resistor Charge pump WLED driver 8-bit microcontroller I/O Terminals and Test Points Terminals and Jumpers for AL3159FSG-EVM Rev.1 I/O and Test Points Description Comments P1 (VIN), P2 (GND) P3 Power Supply and Ground Connect to input power supply Control signal monitoring Use an o’scope to monitor the control signals J11 Input Jumper to AL3159 Jumper for connecting VIN to the AL3159 J12 Input Jumper to controller Jumper for connecting VIN controller circuit VIN, VOUT Voltage Test Points Input and output voltage test points AL3159FSG-EVM Rev.1 4 of 5 www.diodes.com SEPTEMBER 2010 © Diodes Incorporated AL3159 Evaluation Module HIGH EFFICIENCY CHARGE PUMP WHITE LED DRIVER Quick Start Guide 1. Insert jumper J11 to connect VIN to the AL3159 and J12 to connect VIN to the onboard controller. 2. Connect a +2.7V~+5.5V power supply between VIN (P1) and GND (P2) headers. Turn on the power supply. The red power indicator LED (LED11) should be on. 3. The controller will enter State 1, where three control signals are sent to the AL3159 to select the combination of WLEDs to be turned on. The controller will auto-scan the WLEDs with eight combinations. 4. In State 1, the green LED (LED10) will be blinking. Pressing the UP and DOWN buttons will change the rate at which the LED10 blinks and also change the scanning rate of the WLEDs. 5. Press the CYCLE button to move the controller to the next state. Every time the controller enters a new state between States 2 and 8, the corresponding LED group will be turned on while the other WLEDs off. 6. Press the CYCLE button while in State 8 will bring the controller back to State 1. 7. Press and hold the CYCLE button at any time will force the controller to enter State 0. In this state, all WLEDs (LED1-9) will be turned off. So will the green LED (LED10). Press the CYCLE button in State 0 will change the controller state to State 1. Table: Controller Machine States Controller State Green LED (LED10) 0 Off 1 Flashing 2 On Turn on LED1-2 3 On Turn on LED3-5 4 On Turn on LED6-9 5 On Turn on LED9 6 On Turn on LED8-6 7 On Turn on LED5-1 8 On All WLEDs (LED1-9) are on AL3159FSG-EVM Rev.1 Description All WLEDs are turned off Auto-scanning; UP/DOWN buttons change scanning rate. 5 of 5 www.diodes.com SEPTEMBER 2010 © Diodes Incorporated