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MP3204 bảng dữ liệu(PDF) 5 Page - Monolithic Power Systems |
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MP3204 bảng dữ liệu(HTML) 5 Page - Monolithic Power Systems |
5 / 8 page MP3204 – 6V, 1.3MHz WHITE LED DRIVER MP3204 Rev. 1.3 www.MonolithicPower.com 5 9/23/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. TM APPLICATION INFORMATION OFF ON MP3204 VIN 2.5V to 6V LED1 LED2 LED3 MP3204_F02 CMDSH-3 IN EN 5 3 4 61 2 GND OV FB SW Figure 2—Driving 3 White LEDs 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 of up to 1µF may be used. A 22µH inductor with low DCR (inductor resistance) is recommended for improved efficiency. A 1µF ceramic capacitor is recommended for the input capacitance in the real system. Schottky diodes have fast recovery times and a low forward voltage and are also recommended. Schottky diodes with ratings of 100mA to 200mA are sufficient for use with the MP3204. The switching characteristics during normal operation can be seen in Figure 3. The MP3204 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. VOUT RIPPLE (AC COUPLED) 50mV/div. VSW 5V/div. IL 100mA/div. MP3204_F03 Figure 3—Steady-State Operation (VIN=3.6V, 3 LEDs, 20mA) |
Số phần tương tự - MP3204 |
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Mô tả tương tự - MP3204 |
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