©On-Bright Electronics

Confidential

A Liteon Semiconductor Company

- 3 -

V2.1

OB2268

OB2269

Current Mode PWM Controller

Marking Information

TERMINAL ASSIGNMENTS

Pin Num

Pin Name

I/O

Description

1

GND

P

Ground

2

FB

I

Feedback input pin. PWM duty cycle is determined by voltage level into this

pin and current-sense signal level at Pin 6.

3

VIN

I

Connected through a large value resistor to rectified line input for Start up

chip supply and line voltage sensing.

4

RI

I

Internal Oscillator frequency setting pin. A resistor connected between RI

and GND sets the PWM frequency.

5

RT

I

Temperature sensing input pin. Connected through a NTC resistor to GND.

Once the voltage of the RT pin drops below a fixed limit of 1.05V, PWM

output will be disabled.

6

SENSE

I

Current sense input pin. Connected to MOSFET current sensing resistor

node.

7

VDD

P

DC power supply pin.

8

GATE

O

Totem-pole gate drive output for power MOSFET.