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MP3352DQ Datasheet(PDF) 8 Page - Monolithic Power Systems |
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MP3352DQ Datasheet(HTML) 8 Page - Monolithic Power Systems |
8 / 9 page MP3352 – INTEGRATED PHOTO FLASH CHARGER AND IGBT DRIVER MP3352 Rev. 0.9 www.MonolithicPower.com 8 11/12/2008 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. Setting Output Voltage The output voltage is set by selecting the resistive voltage divider ratio. If we use 1.2kΩ the low side resistor (R8) of the voltage divider, we can determine the high side resistor (R2, R5) by the equation: out FB 25 8 FB VV 1 RR R 2V − == Typical values are R2=R5=150kΩ and R8=1.2kΩ. Output Diode Selection The reverse voltage of the output diode is determined by: in out D NV V V + = Quench Function MP3352 has build-in quench function to accurately control exposure time and preserve power, thus to extend battery life. When output capacitor is fully charged and IGBTIN (pin14) is set high, internal IGBT driver drives the gate of IGBT high and fires the flash strobe. Once the photo transistor gets the flash light, it starts to charge C and the voltage of C represents the total exposure. IGBT will be off when the voltage on C exceeds the control voltage on QREF (Pin3) MP3352 SW RDYB SW FB ISET IGBTOUT QREF QSNS GND NC NC IGBTIN PGND PGND CHARGE VIN VCC Control Voltage Photo Transistor C 6 9 15 3 4 2 10 11 7 8 14 5 1 16 13 12 TYPICAL APPLICATION CIRCUIT MP3352 VIN CHARGE Xenon Flash RDYB QREF QSNS GND PGND PGND IGBTIN IGBTOUT ISET FB SW SW NC NC T1 T2 Q2 Q1 VIN CHAG RDYB QREF QSNS IGBTIN VCC 6 9 15 3 4 2 10 11 7 8 14 5 1 16 13 12 + Figure 2—Application Circuit for 2 Cell Li-Ion Battery Photo Flash Charger |
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