PAM99700

Document number: DSxxxxx Rev. 1 - 1

2 of 12

www.diodes.com

October 2012

© Diodes Incorporated

PAM99700

A Product Line of

Diodes Incorporated

Typical Applications Circuit

Pin Descriptions

Pin

Name

Pin Number

Function

SOP-8

SOP-16

VIN

1

1

This pin is the input of a 12V-500V regulator.

CS

2

4

This pin is the current sense pin used to sense the FET current by means of an external sense

resistor. When this pin exceeds the lower of either the internal 250mV or the voltage at the LD pin,

the gate output goes low.

GND

3

5

Ground return for all internal circuitry. This pin must be electrically connected to the ground of the

power train.

GATE

4

8

This pin is the output gate driver for an external N-Channel power MOSFET.

PWMD

5

9

This is the PWM dimming input of the IC. When this pin is pulled to GND, the gate driver is turned

off. When the pin is pulled high, the gate driver operates normally.

VDD

6

12

This is the power supply pin for all internal circuits. It must be bypassed with a low ESR capacitor

to GND (~ 10μF).

LD

7

13

This pin is the linear dimming input an d sets the current sense threshold as long as the voltage at

the pin is less than 250mV (typ).

RT

8

14

This pin sets the oscillator frequency. When a resistor is connected between RT and GND, the

PAM99700 operates in constant frequency mode. When the resistor is connected between RT

and GATE, the IC operates in constant off-time mode.

NC

—

2, 3, 6, 7,

10, 11, 15, 16

Not connected.