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BD9701T Datasheet(PDF) 8 Page - Rohm |
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BD9701T Datasheet(HTML) 8 Page - Rohm |
8 / 17 page BD9701FP/CP-V5/T/T-V5,BD9703FP/CP-V5/T/T-V5,BD9702CP-V5/T/T-V5 Technical Note 8/16 www.rohm.com 2009.04- Rev.B © 2009 ROHM Co., Ltd. All rights reserved. ● Block Function Explanations ・ VREF Generates the regulated voltage from VCC input, compensated for temperature. ・ OSC Generates the triangular wave oscillation frequency using an internal resistors and capacitor. Used for PWM comparator input. ・ Error AMP This block, via the INV pin, detects the resistor-divided output voltage, compares this with the reference voltage, then amplifies and outputs the difference. ・ PWM COMP Outputs PWM signals to the Driver block, which converts the error amp output voltage to PWM form. ・ DRIVER This push-pull FET driver powers the internal Pch MOSFET, which accepts direct PWM input. ・ STBY Controls ON/OFF operation via the STBY pin. The output is ON when STBY is High. ・ Thermal Shutdown (TSD) This circuit protects the IC against thermal runaway and damage due to excessive heat. A thermal sensor detects the junction temperature and switches the output OFF once the temperature exceeds a threshold value (175deg). Hysteresis is built in (15deg) in order to prevent malfunctions due to temperature fluctuations. ・ Over Current Protection (OCP) The OCP circuit detects the voltage difference between VCC and OUT by measuring the current through the internal Pch MOSFET and switches the output OFF once the voltage reaches the threshold value. The OCP block is a self-recovery type (not latch). ● Timing Chart Error AMP OUTPUT OUTPIN OSC (Internal Oscillation Wave) OUTPUT VCC PIN VOLTAGE WAVE VOLTAGE WAVE VOLTAGE WAVE Fig.29 Timing Chart |
Similar Part No. - BD9701T |
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Similar Description - BD9701T |
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