iW339
SSL Interface Controller for Analog (0-10V), PWM, and
Resistor Dimming with Optocoupler Delay Elimination
1 Description
The iW339 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 iW339 converts
either of these three signals into a 0%-100% PWM duty cycle that can then be used to provide a dimming signal to a
primary-side LED driver such as the iW3636, removing the need for transformers or other driver circuitry. The output of
the iW339-01 is optimized in such a way as to remove the impact of the non-linear delay typical of optocouplers. The
output of the iW339-00 provides a standard PWM output.
The output PWM frequency can be programmed from 100Hz to 50kHz through a single capacitor to ground. The input
to the iW339 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
● 0% to 100% PWM output
● 15V to 60V operating voltage
● 3-in-1 dimmer interface
x
x
x
1% PWM duty cycle tolerance
Selectable frequency range via external capacitor
x
x
x
0-10V linear dimming
0-10V PWM dimming
Single resistor dimming
Unique duty cycle drive to account for non-linear
optocoupler delay
● Integrated current source for driving 0-10V dimmer
● Integrated optocoupler driver for isolated applications
● SOIC-8 package
● Low power shutdown mode
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
VOUT
3-in-1
Dimming
Control
AC Input
iW3636
LED Controller
0-10V PWM
RTN
or
iW339
Dimming
10V
0V
VCC
VIN
0-10V Analog
DRV
DIM
FLT
SD
CF
or
GND
Resistive
Figure 3.1 : iW339 Typical Application Circuit
17-Aug-2022
Product Summary
Rev. 1.2
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