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iWatt - Low Power Off-Line Digital PWM Controller

Numéro de référence IW1692
Description Low Power Off-Line Digital PWM Controller
Fabricant iWatt 
Logo iWatt 





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IW1692 fiche technique
iW1692
Low-Power Off-line Digital PWM Controller
1.0 Features
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
Built-in output constant-current control with primary-side
feedback
Low start-up current (10 µA typical)
Built-in soft start
Built-in short circuit protection
AC line under/overvoltage and output overvoltage
protection
40 kHz PWM switching frequency
PFM operation at light load
Built-in ISENSE pin short protection
Space-saving SOT-23 package
2.0 Description
The iW1692 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
provides high efficiency along with a number of key built-in
protection features while minimizing the external component
count and bill of material cost. The iW1692 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 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
L
N
+
+ + VOUT
RTN
+
4 VCC
OUTPUT 3
5 ISENSE
GND 2
6 VIN
VSENSE 1
U1
iW1692
Figure 2.0.1 iW1692 Typical Application Circuit
Rev. 2.0
iW1692
February 13, 2012
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