NCP3020A Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Fabricante

NCP3020A

Synchronous PWM Controller

ON Semiconductor 

NCP3020A, NCP3020B, NCV3020A, NCV3020B

VCC

INTERNAL BIAS

POR/STARTUP

THERMAL SD

VC

BOOST

CLAMP

COMP

FB

OSCILLATOR

CLK/

DMAX/

SOFT

START

RAMP

1.5 V

GATE

DRIVE

LOGIC

REF

OTA

+

−

PWM

COMP

LEVEL

SHIFT

VCC

CURRENT SAMPLE &

LIMIT

HOLD

ISET

VC

+

−

OOV

OUV

+

−

Figure 2. NCP3020 Block Diagram

BST_CHRG

BST

HSDR

VSW

LSDR

GND

PIN FUNCTION DESCRIPTION

Pin Pin Name

Description

1

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.

2

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.

3

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.

4

GND

Ground Pin

5

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.

6

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.

7

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.

8

BST

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

VSW pin.

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