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LED Driver Secondary-Side PWM Signal Generator


Supports 0-0.6V Analog Dimming

The iW338 is a generic PWM signal generator IC that converts a 0-0.6V analog voltage to an inverted 0%–100% PWM duty cycle. The PWM frequency range is set by an external capacitor and can be programmed from 100Hz to 50kHz. The output of the iW338 is a 5V PWM driver capable of driving an external optocoupler or MOSFET.


Input Voltage: 8V to 60V

1% PWM Duty Cycle Tolerance

Programmable PWM Frequency Range: 100Hz to 50kHz

Integrated 5V LDO

For Inputs up to 60V

Reduces BOM Count


PWM Analog LED Dimming

Warm Dimming

Block Diagrams


Typical Applications Diagram


Functional Block Diagram

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Product Briefs and Summaries
Name Date Version
iW338 Product Summary (358.79 KB) 23/02/2019 1.0
Name Date Version
iW338 Datasheet (715.28 KB) (Registered users only) 23/02/2019 1.0
Reference designs
Name Date Version
Reference Design EBC20040: iW3689-11 and iW338-10, 230VAC Input, 54V/150mA Output for Dimmable LED Driver Design with Thermal Color Dimming (1.87 MB) (Registered users only) 14/06/2017 1.0
Reference Design EBC20050: iW3631-00 and iW338-10, 90V-305V Input Voltage, 40W Output Power, Selectable Output Current External LED Driver Design (3.31 MB) (Registered users only) 08/08/2017 1.0