iW1770
Off-Line Digital Quasi-Resonant
PWM Controller with Peak Power Operation
1 Description
The iW1770 is a high performance AC/DC power supply controller that uses digital control technology
to build peak current mode PWM flyback power supplies. The device operates in quasi-resonant mode
to provide high efficiency and includes a number of key built-in protection features while minimizing
the external component count, simplifying EMI design and lowering the total bill of material cost. The
iW1770 can operate at peak power mode with momentary peak power higher than the maximum
continuous output power without design cost and size increase. The iW1770 removes the need for a
secondary feedback circuit while achieving excellent line and load regulation. It also eliminates the
need for loop compensation components while maintaining stability over all operating conditions. Pulse-by-pulse
waveform analysis allows for a fast dynamic load transient reponse. The built-in power limit function enables optimized
transformer design for a wide input voltage range.
Dialog’s innovative proprietary technology ensures that power supplies built with the iW1770 can achieve both the
highest average active efficiency and less than 50mW no-load power consumption in 20W output power range, and
have fast yet smooth start-up with a wide range of capacitive loads with output voltage of 12V and above, and are
ideal for network and ultrabook adapter applications.
2 Features
● No-load power consumption < 50mW at 230VAC along
with fast dynamic load response and short turn-on
delay in typical 20W and above adapter applications
● Proprietary optimized 79kHz maximum PWM
switching frequency with quasi-resonant operation
achieves best size, efficiency and common mode
noise
● PrimAccurateTM primary-side feedback eliminates
opto-isolators and simplifies design
● User-configurable 5-level cable drop compensation
● EZ-EMI® design enhances manufacturability
● Peak power mode provides momentary peak power
higher than the maximum continuous output power
without design cost and size increase
● Adaptive multi-mode PWM/PFM control improves
efficiency and eliminates audible noise
● Adaptively controlled soft-start enables fast and
smooth start-up for a wide range of capacitive loads
(from 330μF to 6,000μF) with output voltage of 12V
and above
● Built-in single-point fault protections against output
short-circuit, output over-voltage, output over-current,
and current-sense-resistor-short fault
● On-chip internal over-temperature protection
● Tight constant-voltage (CV) regulation across line and
load range
● Dedicated pins for user-configurable external
shutdown control
3 Applications
● Power supplies requiring peak power capability such
as network devices, ultrabooks and home electronics
● Universal input AC/DC adapters (15W - 40W)
24-Jan-2022
Product Summary
Rev. 1.2
1 of 6
© 2022 Renesas Electronics
www.renesas.com
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