NCP1201

http://onsemi.com

4

PIN FUNCTION DESCRIPTION

Pin No.

Pin Name

Function

Description

1

BOK

Bulk OK

This pin detects the input line voltage by sensing the bulk capacitor, and

disables the PWM when line voltage is lower than normal.

2

FB

Sets the Peak Current Setpoint

By connecting an optocoupler to this pin, the peak current setpoint is ad-

justed according to the output power demand. Internal monitoring of this

pin level triggers the fault management circuitry.

3

CS

Current Sense Input

This pin senses the primary inductor current and routes it to the internal

comparator via an LEB circuit.

4

GND

The IC Ground

−

5

DRV

Driving Pulses

The driver’s output to an external MOSFET.

6

VCC

Supplies the IC

This pin is connected to an external bulk capacitor of typically 10

mF.

7

NC

No Connection

This unconnected pin ensures adequate creepage distance between High

Voltage pin to other pins.

8

HV

Connected to the high−voltage rail, this pin injects a constant current into

Rating

Symbol

Value

Unit

Power Supply Voltage, Pin 6

−0.3, 16

V

Input/Output Pins

Pins 1, 2, 3, 5

−0.3, 6.5

V

Maximum Voltage on Pin 8 (HV)

500

V

Thermal Resistance, Junction−to−Air, PDIP−8 Version

Thermal Resistance, Junction−to−Air, SOIC Version

100

178

°C/W

°C/W

Operating Junction Temperature Range

−40 to +150

°C

Operating Ambient Temperature Range

−25 to +125

°C

Storage Temperature Range

−55 to +150

°C

−

2.0

kV

−

200

V

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit

values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,

damage may occur and reliability may be affected.

1. This device series contains ESD protection and exceeds the following tests:

Human Body Model (HBM) > 2.0 kV per JEDEC standard: JESD22−A114.

Machine Model (MM) > 200 V per JEDEC standard: JESD22−A115.

2. Latchup Current Maximum Rating:

±150 mA per JEDEC standard: JESD78.