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IR3637ASPBF Datasheet(PDF) 3 Page - International Rectifier |
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IR3637ASPBF Datasheet(HTML) 3 Page - International Rectifier |
3 / 19 page IR3637ASPbF 3 www.irf.com PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS PIN DESCRIPTIONS This pin is connected directly to the output of the switching regulator via resistor divider to set the output voltage and provide feedback to the error amplifier. This pin provides biasing for the internal blocks of the IC as well as powers the low side driver. A minimum of 0.1µF, high frequency capacitor must be connected from this pin to ground to provide peak drive current capability. Output driver for the synchronous power MOSFET. IC's ground pin, this pin must be connected directly to the ground plane. A high frequency capacitor (0.1 to 1µF) must be connected from Vcc and Vc pins to this pin for noise free operation. Output driver for the high side power MOSFET. The negative voltage at this pin may cause instability for the gate drive circuit. To prevent this, a low forward voltage drop diode (e.g. BAT54 or 1N4148) is required between this pin and ground. This pin is connected to a voltage that must be at least 4V higher than the bus voltage (assuming 5V threshold MOSFET) and powers the high side output driver. A minimum of 0.1µF, high frequency capacitor must be connected from this pin to ground to provide peak drive current capability. Compensation pin of the error amplifier. An external resistor and capacitor network is typically connected from this pin to ground to provide loop compensation. This pin provides user programmable soft-start function. Connect an extrnal capacitor from this pin to ground to set the start up time of the output. The converter can be shut- down by pulling this pin below 0.4V. During shutdown both drivers turn off. Error Amp Fb Voltage Input Bias Current Fb Voltage Input Bias Current Transconductance Oscillator Frequency Ramp-Amplitude Voltage Output Drivers Rise Time, Hdrv, Ldrv Fall Time,Hdrv, Ldrv Dead Band Time Max Duty Cycle Min Duty Cycle SS=3V, Fb=0.6V SS=0V, Fb=0.6V CL=1500pF, Vcc=12V,2V to 9V CL=1500pF, Vcc=12V, 9V to 2V Vcc=12V, 2V to 2V Fb=0.6V, Freq=600KHz Fb=1V 450 540 40 76 0 -0.1 -64 600 600 1.25 30 30 150 0 800 660 60 60 200 µA µA µmho KHz V ns ns ns % % PIN# PIN SYMBOL PIN DESCRIPTION 1 2 3 4 5 6 7 8 Fb Vcc LDrv Gnd HDrv Vc Comp SS / SD IFB1 IFB2 gm Freq VRAMP Tr Tf TDB TON TOFF |
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