IW1692 Datasheet, PDF (1/18 Pages) Dialog Semiconductor – Low-Power Off-line Digital PWM Controller

iW1692
Low-Power Off-line Digital PWM Controller
1.0 Features
2.0 Description
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Primary-side feedback eliminates opto-isolators and
simplifies design
Multi-mode operation for highest overall efficiency
Built-in cable drop compensation
Very tight output voltage regulation
No external loop compensation components required
Complies with CEC/EPA/IEC no load power consumption
and average efficiency regulations
The iW1692 is a high performance AC/DC power supply
controller which uses digital control technology to build
s _{peak current mode PWM flyback power supplies. The device}
provides high efficiency along with a number of key built-in
n _{protection features while minimizing the external component}
ig ^{count and bill of material cost. The iW1692 removes the need}
for secondary feedback circuitry while achieving excellent
s line and load regulation. It also eliminates the need for loop
compensation components while maintaining stability over
e _{all operating conditions. Pulse-by-pulse waveform analysis}
D ^{allows for a loop response that is much faster than traditional}
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Built-in output constant-current control with primary-side
feedback
w _{Low start-up current (10 µA typical)}
e Built-in soft start
Built-in short circuit protection
N _{AC line under/overvoltage and output overvoltage}
r _protection
o _{40 kHz PWM switching frequency}
F _{PFM operation at light load}
Built-in I_SENSE pin short protection
d _{Space-saving SOT-23 package}
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.
The low start-up power and PFM operation at light load
ensure that the iW1692 is ideal for applications targeting the
newest regulatory standards for standby power.
3.0 Applications
• Low power AC/DC adapter/chargers for cell phones,
PDAs, digital still cameras
• Standby supplies for televisions, DVDs, set-top boxes
and other consumer electronics
nde _L
N
me⁺
+
+
V_OUT
RTN
Not
Reco^+m
4 V_CC
OUTPUT 3
5 I_SENSE
GND 2
6 V_IN
V_SENSE 1
U1
iW1692
Figure 2.0.1 iW1692 Typical Application Circuit
Rev. 2.0
iW1692
February 13, 2012

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