VIPER22-LED-EV Datasheet, PDF (1/21 Pages) STMicroelectronics – Low power OFF-line SMPS primary switcher

VIPer22A-E
VIPer22ADIP-E, VIPer22AS-E
Low power OFF-line SMPS primary switcher
Features
■ Fixed 60 kHz switching frequency
■ 9 V to 38 V wide range V_DD voltage
■ Current mode control
■ Auxiliary undervoltage lockout with hysteresis
■ High voltage start-up current source
■ Overtemperature, overcurrent and overvoltage
protection with auto-restart
Table 1. Typical power capability
Mains type
SO-8
European (195 - 265 Vac)
US / wide range (85 - 265 Vac)
12 W
7W
DIP-8
20 W
12 W
Description
The VIPer22A-E combines a dedicated current
mode PWM controller with a high voltage power
MOSFET on the same silicon chip.
Figure 1. Block diagram
SO-8
DIP-8
Typical applications cover off line power supplies
for battery charger adapters, standby power
supplies for TV or monitors, auxiliary supplies for
motor control, etc. The internal control circuit
offers the following benefits:
Large input voltage range on the V_DD pin
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.
DRAIN
REGULATOR
INTERNAL
SUPPLY
VDD
FB
_
8/14.5V ₊
+
42V ^_
ON/OFF
60kHz
OSCILLATOR
OVERTEMP.
DETECTOR
S
R1 FF Q
R2 R3 R4
PWM
LATCH
OVERVOLTAGE
R
LATCH
S ^FF Q
BLANKING
+
_ _{0.23 V}
1 kΩ
230 Ω
SOURCE
November 2010
Doc ID 12050 Rev 2
1/21
www.st.com
21