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IR3822AMPBF Datasheet(PDF) 4 Page - International Rectifier |
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IR3822AMPBF Datasheet(HTML) 4 Page - International Rectifier |
4 / 21 page 03/07/08 4 PD-60345 IR3822AMPbF Pin Description Pin Name Description 1 Vsns PGood sense pin. Use two external resistors to program the power good threshold. 2 Fb Inverting input to the error amplifier. This pin is connected directly to the output of the regulator via resistor divider to set the output voltage and provide feedback to the error amplifier. 3 Comp Output of error amplifier. 4 AGnd Signal ground for internal reference and control circuitry. 5 AGnd Signal ground for internal reference and control circuitry. 6 SS/SD Soft start / shutdown. This pin provides user programmable soft-start function. Connect an external capacitor from this pin to signal ground (AGnd) to set the start up time of the output voltage. The converter can be shutdown by pulling this pin below 0.3V. 7 OCSet Current limit set point. A resistor from this pin to SW pin will set the current limit threshold. 8 V CC This pin provides biasing voltage for the internal blocks of the IC. It also powers the low side driver. A minimum of 0.1uF, high frequency capacitor must be connected from this pin to power ground (PGnd). 9 PGood Power Good status pin. Output is open collector. Connect a pull up resistor from this pin to Vcc. 10 PGnd Power Ground. This pin serves as a separated ground for the MOSFET drivers and should be connected to the system’s power ground plane. 11 SW Switch node. This pin is connected to the output inductor 12 V IN Input voltage connection pin 13 HG This pin is connected to the high side Mosfet gate. Connect a small capacitor from this pin to switch node (SW). 14 V C This pin powers the high side driver and must be connected to a voltage higher than input voltage. A minimum of 0.1uF high frequency capacitor must be connected from this pin to the power ground (PGnd). 15 AGnd Signal ground for internal reference and control circuitry. Pins 4, 5 and 15 need to be connected together on system board. |
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