NJW4152

- 9 -

Ver.2015-11-10

PIN DESCRIPTIONS

PIN

NUMBER

PIN NAME

FUNCTION

1

Power Supply pin for Power Line

2

Power Supply pin for IC Control

3

ON/OFF

ON/OFF Control pin

The ON/OFF pin internally pulls down with 480k . Normal Operation at the time

of High Level. Standby Mode at the time of Low Level or OPEN.

4

RT

Oscillating Frequency Setting pin by Timing Resistor.

Oscillating Frequency should set between 300kHz and 1MHz.

5

IN-

Output Voltage Detecting pin

Connects output voltage through the resistor divider tap to this pin in order to

voltage of the IN- pin become 0.8V.

6

FB

Feedback Setting pin

The feedback resistor and capacitor are connected between the FB pin and the

IN- pin.

7

GND

GND pin

8

SW

Switch Output pin of Power MOSFET

–

Exposed

PAD

Connect to GND (only HSOP8 PKG)

Description of Block Features

1. Basic Functions / Features

Error Amplifier Section (ER AMP)

0.8V±1% precise reference voltage is connected to the non-inverted input of this section.

To set the output voltage, connects converter's output to inverted input of this section (IN- pin). If requires output

voltage over 0.8V, inserts resistor divider.

This AMP section has high gain and external feedback pin (FB pin). It is easy to insert a feedback resistor and a

capacitor between the FB pin and the IN- pin, making possible to set optimum loop compensation for each type of

application.

Oscillation Circuit Section (OSC)

Oscillation frequency can be set by inserting resistor between the RT pin and GND. Referring to the sample

characteristics in "Timing Resistor and Oscillation Frequency", set oscillation between 300kHz and 1MHz.

Technical Information

NJW4152 Application Manual