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IW1710 Datasheet, PDF (1/20 Pages) Dialog Semiconductor – Digital PWM Current-Mode Controller for Quasi-Resonant Operation | |||
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iW1710
Digital PWM Current-Mode Controller for Quasi-Resonant Operation
1.0 Features
ââ Primary-side feedback eliminates opto-isolators and
simplifies design
ââ Quasi-resonant operation for highest overall efficiency
ââ EZ-EMI ® design to easily meet global EMI standards
ââ Up to 130 kHz switching frequency enables small
adapter size
ââ Very tight output voltage regulation
ââ No external compensation components required
ââ Complies with CEC/EPA no-load power consumption
and average efficiency regulations
ââ Built-in output constant-current control with primary-side
feedback
ââ Low start-up current (10â¯ÂµA typical)
ââ Built-in soft start
ââ Built-in short circuit protection and output overvoltage
protection
ââ Optional AC line under/overvoltage protection
ââ PFM operation at light load
ââ Current sense resistor short protection
ââ Overtemperature Protection
2.0 Description
The iW1710 is a high performance AC/DC power supply
controller which uses digital control technology to build
peak current mode PWM flyback power supplies. The
device operates in quasi-resonant mode at heavy load to
provide high efficiency along with 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 iW1710 removes the need for secondary
feedback circuitry 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
loop response that is much faster than traditional solutions,
resulting in improved dynamic load response. The built-in
current limit function enables optimized transformer design
in universal off-line applications over a wide input voltage
range.
The ultra-low operating current at light load ensures that
the iW1710 is ideal for applications targeting the newest
regulatory standards for average efficiency and standby
power.
3.0 Applications
ââ Cable/DSL modems, WLAN access points and VOIP
gateways.
L
N
+
+
VOUT
RTN
Rev. 2.5
+
Optional
NTC
Thermistor
1 NC
VCC 8
2 VSENSE OUTPUT 7
3 VIN
ISENSE 6
4 SD
GND 5
U1
iW1710
Figure 3.1 : Typical Application Circuit
iW1710
November 27, 2012
Page 1
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