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PDF IW1688 Data sheet ( Hoja de datos )
| Número de pieza | IW1688 | |
| Descripción | Low Power Off Line Digital PWM Controller | |
| Fabricantes | iWatt | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IW1688 (archivo pdf) en la parte inferior de esta página. Total 4 Páginas | ||
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iW1688
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
• ±4% typical output voltage regulation
• No external compensation components required
• Complies with CEC/EPA no load power consumption
and average efficiency regulations
• Built-in output constant-current control with foldback
• Low start-up current (8 µA typical)
• Built-in soft start
• Built-in short circuit protection
• AC line under/overvoltage and output overvoltage
protection
• Fixed 40 kHz switching frequency
2.0 Description
The iW1688 is a high performance power supply controller
which uses digital control technology to build sensorless
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 iW1688 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 typically much faster than
traditional solutions, resulting in significantly better 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 ultra-low start-up power and operating current at light
load ensure that the iW1688 is ideal for applications targeting
the newest Agency standards for average efficiency and
standby power.
3.0 Applications
DataShee
DataSheet4•U.cLoomw power AC/DC adapter/chargers for cell phones,
PDAs, digital still cameras - (up to 20W)
• Standby supplies for televisions, DVDs, set-top boxes
and other consumer electronics
L
N
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+5V
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RTN
DataSheet4U.com
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4 VCC
OUTPUT 3
GND 2
5 VIN
VSENSE 1
U1
iW1688
Figure 2.0.1 iW1688 Typical Application Circuit
MK-4004-NR
04/03/06
DataSheet4U.com
PAGE 1
1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet IW1688.PDF ] | |
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