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IRU3048CF Datasheet(PDF) 3 Page - International Rectifier |
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IRU3048CF Datasheet(HTML) 3 Page - International Rectifier |
3 / 18 page IRU3048 3 Rev. 1.7 09/12/02 www.irf.com PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS PIN DESCRIPTIONS PIN# PIN SYMBOL PIN DESCRIPTION Error Amp Fb Voltage Input Bias Current Fb Voltage Input Bias Current Transconductance 1 Transconductance 2 Oscillator Frequency Ramp Amplitude Output Drivers Rise Time Fall Time Dead Band Time Max Duty Cycle Min Duty Cycle LDO Controller Drive Current Fb Voltage Input Bias Current SS=3V SS=0V CL=1500pF CL=1500pF Fb=1V, Freq=200KHz Fb=1.5V 180 50 85 0 30 1.225 -0.1 -64 400 600 200 1.25 35 50 150 90 0 45 1.25 0.5 220 100 100 250 1.275 2 mA mA mmho mmho KHz VPP ns ns ns % % mA V mA 1 2 16 3 4 5 12 6 11 7 10 8 9 13 14 15 Gnd Fb2 Fb1 Comp1 Comp2 VcH2 VcH1 HDrv2 HDrv1 LDrv2 LDrv1 PGnd Vcc VOUT3 Fb3 SS Ground pin. Inverting inputs to the error amplifiers. These pins work as feedback inputs for each channel, and are connected directly to the output of the switching regulator via a resistor divider to set the output voltages. Compensation pins for the error amplifiers. Supply voltage for the high side output drivers. These are connected to voltages that must be at least 4V higher than their bus voltages (assuming 5V threshold MOSFET). A minimum of 1 mF high frequency capacitor must be connected from these pins to PGnd pin to provide peak drive current capability. Output driver for the high side power MOSFET. Connect a diode, such as BAT54 or 1N4148, from these pins to ground for the application 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. Output driver for the synchronous power MOSFET. This pin serves as the separate ground for MOSFET’s driver and should be connected to the system’s ground plane. Supply voltage for the internal blocks of the IC. Driver signal for the LDO’s external transistor. LDO’s feedback pin, connected to a resistor divider to set the output voltage of LDO. Soft-Start pin. The converter can be shutdown by pulling this pin below 0.5V. IFB1 IFB2 gm1 gm2 Freq VRAMP Tr Tf TDB TON TOFF ILDO VFBLDO ILDO(BIAS) |
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