iW337

Signal Interface Controller for Analog (0–10V),

PWM, and Resistor Dimming

Rev. 0.3 Preliminary

Product Summary

© 2017 Dialog Semiconductor

www.dialog-semiconductor.com

1 of 5

Company Confidential

9-February-2017

1 Description

The iW337 is a PWM signal generator that works with three different types of dimming inputs, 0-10V PWM dimming,

0-10V linear dimming or simple dimming using a single resistor to ground from the DIM pin. The iW337 converts

either of these three signals into a 1%-100% PWM duty cycle that can then be used to provide a dimming signal to a

primary-side LED driver such as the iW3631, removing the need for transformers or other driver circuitry.

The output PWM frequency can be programmed from 100Hz to 50kHz through a single capacitor to ground. The input

to the iW337 integrates the necessary current source to interface with both active and passive 0-10V dimmers without

additional circuitry, while the output can drive an optocoupler to provide isolated dimming control from the secondary

to the primary.

2 Features

● 15V to 60V operating voltage

● 3-in-1 dimmer interface

x

0-10V linear dimming

x

0-10V PWM dimming

x

Single resistor dimming

● SOIC-8 package

3 Applications

● 0-10V LED dimming application

● 3-in-1 LED driver interface chip (0–10V linear,

0-10V PWM and R dimming) dimming LED driver

application

● 1% to 100% PWM output

x

1% PWM duty cycle tolerance

x

Selectable frequency range via external capacitor

● Low power shutdown mode

● Integrated current source for driving 0-10V dimmer

● Integrated optocoupler driver for isolated applications

AC Input

iW337

V

CC

DRV

FLT

GND

CF

SD

DIM

V

IN

iW3631

LED Controller

RTN

Dimming

V

OUT

10V

0V

3-in-1

Dimming

Control

or

or

0-10V PWM

0-10V Analog

Resistive

Figure 3.1 : iW337 Typical Application Circuit