VIPER20A-E STMicroelectronics

VIPer20A-E SMPS primary I.C. General features V I R Type DSS n DS(on) 18 VIPer20A-E 700V 0.5A DIP-8 VIPer20ASP-E 700V 0.5A 18 PENTAWATT HV VIPer20ADIP-E 700V 0.5A 18 10 Adjustable switching frequency up to 200 kHz 1 Current mode control TM POWERSO-10 PENTAWATT HV (022Y) Soft start and shutdown control Automatic burst mode operation in stand-by condition able to meet blue angel norm (<1w Description total power consumption) All the devices are made using VIPower M0 Internally trimmed zener reference Technology, combines on the same silicon chip a Undervoltage lock-out with hysteresis state-of-the-art PWM circuit together with an optimized, high voltage, Vertical Power MOSFET Integrated start-up supply (700V/ 0.5A). Over-temperature protection Typical applications cover offline power supplies Low stand-by current with a secondary power capability of 10W in wide Adjustable current limitation range condition and 20W 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. Block diagram OSC DRAIN ON/OFF OSCILLATOR SECURITY PWM LATCH LATCH S UVLO FF FF VDD R/S Q R1 Q LOGIC S R2 R3 OVERTEMP. DETECTOR 0.5V + 0.5 V + 1.7 + 6 V/A 250 ns s Blanking delay CURRENT ERROR AMPLIFIER AMPLIFIER 13 V + 4.5 V COMP SOURCE June 2006 Rev 2 1/34 www.st.com 34 FC00491Contents VIPer20A-E Contents 1 Electrical data 4 1.1 Maximum rating . 4 1.2 Electrical characteristics . 5 2 Thermal data . 7 3 Pin description 8 3.1 Drain pin (Integrated Power MOSFET drain): . 8 3.2 Source pin: . 8 3.3 VDD pin (power supply): . 8 3.4 Compensation pin 8 3.5 OSC pin (oscillator frequency): 9 4 Typical circuit 10 5 Operation description . 11 5.1 Current mode topology: 11 5.2 Stand-by mode . 11 5.3 High voltage start-up current suorce . 12 5.4 Transconductance error amplifier . 13 5.5 External clock synchronization: . 14 5.6 Primary peak current limitation . 14 5.7 Over-temperature protection . 14 5.8 Operation pictures . 15 2/34