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Numéro de référence | IW1692 | ||
Description | Low Power Off-Line Digital PWM Controller | ||
Fabricant | iWatt | ||
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1 Page
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
Page 1
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Pages | Pages 18 | ||
Télécharger | [ IW1692 ] |
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