NCP4308

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4

PIN FUNCTION DESCRIPTION

ver. A, B, C, D

ver. Q

Pin Name

Description

1

1

VCC

Supply voltage pin

2

2

MIN_TOFF

Adjust the minimum off time period by connecting resistor to ground.

3

3

MIN_TON

Adjust the minimum on time period by connecting resistor to ground.

4

4

NC

Leave this pin opened or tie it to ground.

5

−

NC

Leave this pin opened or tie it to ground.

6

6

CS

Current sense pin detects if the current flows through the SR MOSFET and/or its body

diode. Basic turn−off detection threshold is 0 mV. A resistor in series with this pin can

decrease the turn off threshold if needed.

7

7

GND

mum on and off time adjust resistors. GND pin should be wired directly to the SR

MOSFET source terminal/soldering point using Kelvin connection. DFN8 exposed flag

should be connected to GND

8

8

DRV

Driver output for the SR MOSFET

−

5

MAX_TON

Adjust the maximum on time period by connecting resistor to ground.

Minimum ON time

generator

MIN_TON

CS

detection

100

mA

CS

MIN_TOFF

NC

CS_ON

CS_OFF

DRV

VCC

GND

UVLO

DRV Out

DRIVER

CS_RESET

NC

ADJ

ELAPSED

EN

Minimum OFF

time generator

ADJ

RESET

ELAPSED

Control logic

EN

Figure 5. Internal Circuit Architecture − NCP4308A, B, C, D