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IRU3138 Datasheet(PDF) 3 Page - International Rectifier |
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IRU3138 Datasheet(HTML) 3 Page - International Rectifier |
3 / 18 page IRU3138 3 Rev. 1.0 01/29/04 www.irf.com PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS This pin is connected directly to the output of the switching regulator via resistor divider to provide feedback to the Error amplifier. Non-inverting input of error amplifier. Reference Voltage. This pin provides biasing for the internal blocks of the IC as well as power for the low side driver. A minimum of 1 mF, high frequency capacitor must be connected from this pin to ground to provide peak drive current capability. No Connection. Output driver for the synchronous power MOSFET. Analog ground for internal reference and control circuitry. Connect to PGnd with a short trace. This pin serves as the separate ground for MOSFET's drivers and should be connected to system's ground plane. A high frequency capacitor (0.1 mF to 1mF) must be connected from VCC and VC pins to this pin for noise free operation. Output driver for the high side power MOSFET. This pin should not go negative (below ground), this may cause problem for the gate drive circuit. It can happen when the inductor current goes negative (Source/Sink), soft-start at no load and for the fast load transient from full load to no load. To prevent negative voltage at gate drive, a low forward voltage drop diode might be connected between this pin and ground. This pin is connected to a voltage that must be at least 4V higher than the bus voltage of the switcher (assuming 5V threshold MOSFET) and powers the high side output driver. A minimum of 1 mF, high frequency capacitor must be connected from this pin to ground to provide peak drive current capability. The switching frequency can be Programmed between 200KHz and 400KHz by connect- ing a resistor between Rt and Gnd. Floating the pin set the switching frequency to 200KHz and grounding the pin set the switching frequency to 400KHz. 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 soft-start for the switching regulator. An internal current source charges an external capacitor that is connected from this pin to ground which ramps up the output of the switching regulator, preventing it from overshooting as well as limiting the input current. The converter can be shutdown by pulling this pin below 2.8V. Error Amp Fb Voltage Input Bias Current Fb Voltage Input Bias Current VP Voltage Range Transconductance Output Drivers Rise Time Fall Time Dead Band Time Max Duty Cycle Min Duty Cycle SS=3V, Fb=1V SS=0V, Fb=1V CLOAD=3000pF CLOAD=3000pF Fb=0.7V, Freq=200KHz Fb=1.5V 0.7 500 85 0.1 50 800 35 35 100 90 mA mA V mmho ns ns ns % % 1 2 3 4 5 14 6 7 8 9 10 11 12 13 Fb VP VREF VCC NC LDrv Gnd PGnd HDrv VC Rt Comp SS / SD IFB1 IFB2 GM Tr Tf TDB Ton Toff 1.5 1000 70 70 0 Note 1: Guaranteed by design, but not tested in production. PIN DESCRIPTIONS PIN# PIN SYMBOL PIN DESCRIPTION |
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