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MP1518DJ Datasheet(PDF) 5 Page - Monolithic Power Systems |
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MP1518DJ Datasheet(HTML) 5 Page - Monolithic Power Systems |
5 / 9 page MP1518 – FIXED FREQUENCY WHITE LED DRIVER MP1518 Rev. 1.6 www.MonolithicPower.com 5 7/25/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM APPLICATION INFORMATION OFF ON MP1518 VIN 2.5V to 6V LED1 LED2 LED3 CMDSH-3 IN EN GND OV FB SW Figure 2—Circuit for Driving 3 WLEDs A typical application circuit can be seen in Figure 2. The 3 white LEDs can be driven from a voltage supply range of 2.5V to 6V at an output current of 20mA. A 0.22µF output capacitor is sufficient for most applications but an output capacitor up to 1µF may be used. A 22µH inductor with low DCR (Inductor resistance) is recommended to improve efficiency. A 1µF ceramic capacitor is recommended for the input capacitance in the real system. Schottky diodes have fast recovery and a low forward voltage and are recommended. Schottky diodes rated with 100mA to 200mA are sufficient for the MP1518. The switching characteristics during normal operation can be seen in Figure 3. The MP1518 has internal soft-start to limit the amount of current through VIN at startup and to also limit the amount of overshoot on the output. The current limit is increased by a fourth every 40µs giving a total soft-start time of 120µs. VSW 5V/div. VOUT AC 50mV/div. IL 100mA/div. 200ns/div. Steady State Operation VIN = 3.6V, 3 LEDS, 20mA Figure 3—Steady State Operation Figure 4 shows the startup behavior of the MP1518. The ramped voltage that is added to the current sense amplifier reduces the current output as the duty cycle increases. As more LEDs are added, the output voltage rises but the current that can be delivered to the load is reduced as well. |
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