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EV0021 Datasheet(PDF) 3 Page - Monolithic Power Systems |
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EV0021 Datasheet(HTML) 3 Page - Monolithic Power Systems |
3 / 4 page EV0021 MP1521 High Efficiency White LED Driver EVALUATION BOARD EV0021 Rev 1.1_01/21/03 www.monolithicpower.com 3 Monolithic Power Systems Table 1: EV0021 Bill of Materials Parts Package Vendor QTY Components ICs MP1521EQ QFN16 MPS 1 U1 Capacitors 4.7 µF 1206 Any 1 C1 1 µF, 25V 1210 Any 1 C2 Resistors 10K Ω 0603 Any 3 R1, R2, R3 20 Ω 0603 Any 3 R4, R5, R6 Inductors 15 µH CDRH3D16 Sumida 1 L1 Diodes B130, 1A, 30V, Schottky SMA Any 1 D1 LEDS (Not Provided) Operating Instructions 1. Connect VCC to the power source’s positive output. 2. Connect GND to supply ground. 3. Applying a logic signal to EN pin will enable the MP1521. Logic high (VEN>1V) turns on IC, logic low puts it into low current shutdown mode. Place a 100K Ω resistor in series with EN if the input is greater than 10V. For automatic start up connect EN to VCC. 4. Applying a PWM signal to the BRT will adjust the LED brightness. When used in analog mode, apply a DC voltage of 0.3 to 1.2V. This input voltage is attenuated by 1/3 to set the voltage across sense resistors at FB1, FB2, and FB3. Maximum brightness (20mA) occurs with 1.2V applied. To control brightness in PWM mode, apply a PWM square wave with a minimum voltage less the 0.18V and a maximum greater than 1.2V. When a voltage less than 0.18V is applied to this pin, the output switch is turned off. The regulator operates at maximum brightness when more than 1.2V is applied. The frequency of the PWM signal must be between 100 to 400 Hz. 5. The FB1, FB2 and FB3 pins can be used to measure the voltage across the current-sense resistor that is in series with the LED strings. Unused feedback pins must be connected to any used feedback pin. 6. OLS senses the regulator output voltage to protect IC during open load operation. When this pin’s voltage exceeds 28V, the output switch is shut off. The output switch remains off until the IC is reset by cycling the enable pin (EN) or input supply (VIN) |
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