Rev 1
September 2005 1/29
29
VIPer50-E
SMPS PRIMARY I.C.
General Features
■ ADJUSTABLE SWITCHING FREQUENCY UP
TO 200 kHz
■ CURRENT MODE CONTROL
■ SOFT START AND SHUTDOWN CONTROL
■ AUTOMATIC BURST MODE OPERATION IN
STAND - BY CONDITION ABLE TO MEET
“BLUE ANGEL” NORM (<1w TOTAL POWER
CONSUMPTION)
■ INTERNALLY TRIMMED ZENER
REFERENCE
■ UNDERVOLTAGE LOCK-OUT WITH
HYSTERESIS
■ INTEGRATED START-UP SUPPLY
■ OVER-TEMPERATURE PROTECTION
■ LOW STAND-BY CURRENT
■ ADJUSTABLE CURRENT LIMITAT ION
Blo ck Diag r am
Description
VIPer50-E, made using VIPower M0 Technology,
combines on t he same si licon chip a state-of-the-
art PWM circuit together with an optimized, high
voltage, Vertical Power MOSFET (620V/ 1.5A).
Typical applications cover offline power supplies
with a secondary power capability of 25W in wide
range condition and 50W in single range or with
doubler configuration. 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 ability to operate in stand-by mode
without extra components.
Type
V
DSS
I
n
R
DS(on)
VIPer50-E 620V 1.5A 5 Ω
PENTAWATT HV
PENTAWATT HV (022Y)
www.st.com
V
DD
OSC
COMP
DRAIN
SOURCE
13 V
UVLO
LOGIC
SECURITY
LATCH
PWM
LATCH
FF
FF
R/S
S
Q
S
R1
R2 R3
Q
OSCILLATOR
OVERT EMP.
DETECTOR
ERROR
AMPLIFIER
_
+
0.5 V
+
_
1.7
µ
s
DELAY
250 ns
BLANKING
CURRENT
AMPLIFIER
ON/OFF
0.5V
2 V/A
_
+
+
_
4.5 V
