NX2158 Datasheet, PDF (4/5 Pages) Microsemi Corporation – PWM BOOST CONTROLLER

NX2158
PIN DESCRIPTIONS
PIN #
5
PIN SYMBOL
VCC
PIN DESCRIPTION
Voltage supply for the low side fet driver and internal logic circuit. A high
frequency 1uF ceramic capacitor must be connected from this pin to the GND
pin as close as possible.
7
ENBUS
Enable pin for the controller.
12
FB
This pin is the error amplifier inverting input.
11
COMP
This pin is the output of the error amplifier and together with FB pin is used to
compensate the voltage control feedback loop. This pin is also used as a shut
down pin. When this pin is pulled below 0.3V, both drivers are turned off and
internal soft start is reset.
2
BST
This pin supplies voltage to the high side driver. A high frequency
ceramic capacitor of 0.1 to 1 uF must be connected from this pin to ground.
15
OCP
An internal current source is flown to the OCP resistor sets the OCP voltage
across the Rdson of the low side MOSFET. Current limit point is this voltage
divided by the Rds-on.
14
SW
This pin is used by driver circuit and also sensing the RDSON of NMOSFET.
1
HDRV
PMOS MOSFET gate driver.
3
PGND
Power ground.
10
AGND
Analog ground
4
LDRV
NMOSFET gate driver.
7
RT
Oscillator's frequency can be set by using an external resistor from this pin to
GND.
8
PGOOD
Power good indicator.
17
PAD
PAD should be connected to ground.
13,16
NC
Not used.
Rev.1.2
Microsemi
4
12/30/09
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]