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IR3476 Datasheet(PDF) 5 Page - International Rectifier |
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IR3476 Datasheet(HTML) 5 Page - International Rectifier |
5 / 21 page March 27, 2013 | V2.2 | PD97603 5 IR3476 12A Highly Integrated SupIRBuck TM PIN DESCRIPTIONS PIN # PIN NAME I/O LEVEL PIN DESCRIPTION 1 FCCM 3.3V Forced Continuous Conduction Mode (CCM). Ground this pin to enable diode emulation mode or discontinuous conduction mode (DCM). Pull this pin to 3.3V to operate in CCM under all load conditions. 2 ISET Connecting resistor to PHASE pin sets over current trip point. 3 PGOOD 5V Power good open drain output – pull up with a resistor to 3.3V 4, 17 GND Reference Bias return and signal reference. 5 FB 3.3V Inverting input to PWM comparator, OVP / PGOOD sense. 6 SS 3.3V Soft start/shutdown. This pin provides user programmable soft‐start function. Connect an external capacitor from this pin to GND to set the startup time of the output voltage. The converter can be shutdown by pulling this pin below 0.3V. 7 NC ‐ ‐ 8 3VCBP 3.3V For internal LDO. Bypass with a 1.0µF capacitor to GND. 9 NC ‐ ‐ 10 VCC 5V VCC input. Gate drive supply. A minimum of 1.0µF ceramic capacitor is required. 11 PGND Reference Power return. 12 PHASE VIN Phase node (or switching node) of MOSFET half bridge. 13 VIN VIN Input voltage for the system. 14 BOOT VIN + VCC Bootstrapped gate drive supply – connect a capacitor to PHASE. 15 FF VIN Input voltage feed forward – sets on‐time with a resistor to VIN. 16 EN 5V Enable pin to turn on and off the device. Use two external resistors to set the turn on threshold (see Electrical Specifications) for input voltage monitoring. |
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