NCP3012 Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Fabricante

NCP3012

Synchronous PWM Controller

ON Semiconductor 

NCP3012

PIN FUNCTION DESCRIPTION

Pin Pin Name

Description

1

VREF The VREF pin is the output for a 1.25 V reference (1 mA max). A 100 kW resistor in parallel with a 1 mF

ceramic capacitor must be connected from this pin to GND to ensure external reference stability.

2

EN

The EN pin is the enable/disable input. A logic high on this pin enables the device. This pin has also an internal

current source pull up. A 10 kW resistor should be connected in series with this pin if VEN is externally biased

from a separate supply.

3

NC

Not Connected

4

SYNC The dual function SYNC pin synchronizes the device to a higher frequency (Slave Mode). Alternately, it outputs

an 85 kHz clock signal with 180° of phase shift (Master Mode). Connect a 60 kW resistor from SYNC to GND

to enable Master Mode. No resistor is required for Slave Mode.

5

PG

The Power Good pin is an open drain output that is low when the regulated output voltage is beyond the

“Power Good” upper and lower thresholds. Otherwise, it is a high impedance pin.

6

COMP The COMP pin connects to the output of the Operational Transconductance Amplifier (OTA) and the positive

terminal of the PWM comparator. This pin is used in conjunction with the FB pin to compensate the voltage

mode control feedback loop.

7

FB

The FB pin is connected to the inverting input of the OTA. This pin is used in conjunction with the COMP pin to

compensate the voltage mode control feedback loop.

8

GND

Ground Pin

9

LSDR The LSDR pin is connected to the output of the low side driver which connects to the gate of the low side

N−FET. It is also used to set the threshold of the current limit circuit (ISET) by connecting a resistor from LSDR

to GND.

10

NC

Not Connected

11

VSW

The VSW pin is the return path for the high side driver. It is also used in conjunction with the VCC pin to sense

current in the high side MOSFET.

12

HSDR The HSDR pin is connected to the output of the high side driver which connects to the gate of the high side

N−FET.

13

BST

The BST pin is the supply rail for the gate drivers. A capacitor must be connected between this pin and the

VSW pin.

14

VCC

The VCC pin is the main voltage supply input. It is also used in conjunction with the VSW pin to sense current

in the high side MOSFET.

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