VIPER20B
VIPER20B is SMPS PRIMARY I.C. manufactured by STMicroelectronics.
®
VIPer20B VIPer20BSP
SMPS PRIMARY I.C.
PRELIMINARY DATA
T YPE VIPer20B/ SP
V DSS 400V
In 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
PENTAWATT HV
Power SO-10
DESCRIPTION VIPer20B™ bines 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 patible from both primary or secondary regulation loop despite using around 50% less ponents when pared 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 ponents.
DRAIN
ON/OFF OSCILLATOR
SECURITY LATCH VDD UVLO LOGIC R/S FF S Q
PWM LATCH R1 S FF R2 R3 Q
OVERTEMP. DETECTOR
0.5 V
+ _
2 µs delay
300 ns Blanking
+ _
+
0.5V _ 6 V/A
_ 13 V +
ERROR AMPLIFIER
CURRENT AMPLIFIER
4.5 V
SOURCE
FC00490...
