VIPER20B Datasheet, PDF (1/17 Pages) STMicroelectronics – SMPS PRIMARY I.C.

VIPer20B
®
VIPer20BSP
TYPE
VIPer20B/ SP
V_DSS
400V
I_n
1.3 A
R_DS(on)
8.7 Ω
FEATURE
s ADJUSTABLE SWITCHING FREQUENCY UP
TO 200KHZ
s CURRENT MODE CONTROL
s SOFT START AND SHUT DOWN CONTROL
s AUTOMATIC BURST MODE OPERATION IN
STAND-BY CONDITION ABLE TO MEET
”BLUE ANGEL” NORM (1W TOTAL POWER
CONSUMPTION)
s INTERNALLY TRIMMED ZENER
REFERENCE
s UNDERVOLTAGE LOCK-OUT WITH
HYSTERESIS
s INTEGRATED START-UP SUPPLY
s AVALANCHE RUGGED
s OVERTEMPERATURE PROTECTION
s LOW STAND-BY CURRENT
s ADJUSTABLE CURRENT LIMITATION
BLOCK DIAGRAM
SMPS PRIMARY I.C.
PRELIMINARY DATA
10
PENTAWATT HV
1
Power SO-10
DESCRIPTION
VIPer20B™ combines on the same silicon chip a
state-of-the-art PWM circuit together with an
optimized high voltage avalanche rugged Vertical
Power MOSFET (400V 1.3A).
Typical applications cover off line power supplies
with a secondary max power capability of 30W. It
is compatible from both primary or secondary
regulation loop despite using around 50% less
components when compared with a discrete
solution. Burst mode operation is an additional
feature of this device, offering the possibility to
operate in stand-by mode without extra
components.
OSC
DRAIN
VDD
ON/OFF
OSCILLATOR
UVLO
LOGIC
SECURITY
LATCH
R/S ^FF Q
S
PWM
LATCH
S
R1 ^FF Q
R2 R3
OVERTEMP.
DETECTOR
0.5 V +
_
ERROR
AMPLIFIER
_
13 V +
4.5 V
2 µs
delay
300 ns
Blanking
COMP
September 1999
0.5V
++ ^_
6 V/A
_
CURRENT
AMPLIFIER
SOURCE
1/17