VIPER22A

Manufacturer Part NumberVIPER22A
ManufacturerSTMicroelectronics
VIPER22A datasheet
 


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Features
Fixed 60kHZ Switching Frequency
9V to 38V Wide Range V
DD
Current Mode Control
Auxiliary Undervoltage Lockout with Hysteresis
High Voltage Start-up Current Source
Overtemperature, Overcurrent and
Overvoltage Protection with Auto-Restart
Typical Power Capability
Mains type
European (195 - 265 Vac)
US / Wide range (85 - 265 Vac)
Block diagram
REGULATOR
INTERNAL
SUPPLY
_
VDD
8/14.5V
+
+
_
42V
FB
February 2006
Low Power OFF-Line SMPS Primary Switcher
Voltage
Description
The VIPer22A-E combines a dedicated current
mode PWM controller with a high voltage Power
MOSFET on the same silicon chip.
Typical applications cover off line power supplies
SO-8
DIP-8
for battery charger adapters, standby power
12W
20W
supplies for TV or monitors, auxiliary supplies for
motor control, etc. The internal control circuit
7W
12W
offers the following benefits:
– Large input voltage range on the V
accommodates changes in auxiliary supply
voltage. This feature is well adapted to
battery charger adapter configurations.
– Automatic burst mode in low load condition.
– Overvoltage protection in HICCUP mode.
ON/OFF
60kHz
OSCILLATOR
PWM
S
LATCH
OVERTEMP.
FF
R1
Q
DETECTOR
R2
R3
R4
BLANKING
OVERVOLTAGE
LATCH
R
FF
S
Q
Rev1
VIPer22ADIP - E
VIPer22AS - E
SO-8
DIP-8
DD
DRAIN
+
_
0.23 V
230 Ω
1 kΩ
SOURCE
www.st.com
pin
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VIPER22A Summary of contents