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IR3863MPBF
Pin Description
I/O
NAME
FCCM
NUMBER
1
LEVEL
3.3V
DESCRIPTION
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.
ISET
2
Connecting resistor to PHASE pin sets over current trip point.
PGOOD
GND
FB
SS
3
4,17
5
6
5V
Reference
3.3V
3.3V
Power good open drain output – pull up with a resistor to 3.3V
Bias return and signal reference.
Inverting input to PWM comparator, OVP / PGOOD sense.
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.
NC
3VCBP
7
8
-
3.3V
-
For internal LDO. Bypass with a 1.0μF capacitor to AGND. A
resistor in series with the bypass capacitor may be required in
single-ground plane designs. Refer to Layout
Recommendations for details.
NC
VCC
9
10
-
5V
-
VCC input. Gate drive supply. A minimum of 1.0μF ceramic
capacitor is required.
PGND
PHASE
VIN
BOOT
11
12
13
14
Reference
VIN
VIN
VIN +VCC
Power return.
Phase node (or switching node) of MOSFET half bridge.
Input voltage for the system.
Bootstrapped gate drive supply – connect a capacitor to
PHASE.
FF
EN
15
16
VIN
5V
Input voltage feed forward – sets on-time with a resistor to VIN.
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.
8/8/2012 Rev3.2
4
发布紧急采购，3分钟左右您将得到回复。
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