iW1702

Offline Digital Quasi-Resonant PWM Controller Optimized

for 9V+ Applications with Option for Input OVP

Rev. 1.4

Product Summary

© 2017 Dialog Semiconductor

www.dialog-semiconductor.com

1 of 8

24-Oct-2017

1 Description

The iW1702 is a high performance, digital AC/DC power supply controller for high-power, peak current mode flyback

converters. The device integrates a programmable light load mode of operation allowing the power supply designer to

optimize for no-load power consumption and dynamic load response. It operates in quasi-resonant mode to provide

high efficiency at heavy loads and minimizes the external component count while simplifying EMI design and lowering

the total bill of material cost.

Dialog’s

feedback while achieving excellent line and load regulation. This proprietary digital control technology also eliminates

the need for loop compensation components while maintaining stability over all operations. Pulse-by-pulse waveform

analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load

response. The built-in power limit function enables optimized transformer design in universal off-line applications and

allows for a wide input voltage range.

Dialog’s innovative proprietary technology ensures that power supplies built with the iW1702 can achieve both the

highest average active efficiency and less than 75mW no-load power consumption. Active start-up circuitry enables

fast, yet smooth start-up into large capacitive loads at output voltages of 9V, 12V or higher, making it ideal for

networking and monitor adaptor applications.

The iW1702 offers a full range of fault protection circuits including internal and external over-voltage protection (OVP).

The external OVP feature can monitor either the input voltage or output voltage. The -0x/0xB and -3x/3xB options

offer a supplemental output OVP, while the -1x/1xB options can monitor the input voltage, even during start-up, to

protect from an over-voltage event on the input.

2 Features

● iW1702-0x/0xB and iW1702-3x/3xB options: external

supplemental output over-voltage protection,

optimized for 9V+ output voltages

● iW1702-1x/1xB options: external input over-voltage

protection, supports 5V+ output voltages

● Adaptively controlled soft-start enables fast and

smooth start-up into large capacitive loads (from

● Internal single-point fault protections against output

short-circuit, output over-voltage and output over-

current

● User-configurable light-load operation mode for

optimized dynamic load response and no-load power

consumption

fast dynamic load response in typical 12V, 2A 24W

compact adapter/charger

●

optocouplers and simplifies design

3 Applications

● Power adapters for network devices and monitors

● Universal AC/DC adapters (5 – 45W)

● Proprietary optimized 79kHz maximum PWM

switching frequency with quasi-resonant operation

achieves best size, efficiency and common mode

noise

● Adaptive multi-mode PWM/PFM control improves

efficiency

● User-configurable 5-level cable drop compensation

provides design flexibility in iW1702-0x/0xB and

iW1702-3x/3xB options

● Tight constant-voltage and constant current

regulation across line and load range

●

SmartDefender™ smart hiccup technology helps

to address issues of soft shorts in cables and

connectors by effectively reducing the average output

power at fault conditions without latch

● Optional on-chip internal over-temperature protection

● No audible noise over entire operating range

● Space-saving SOT-23 package