VIPER37LE STMicroelectronics

VIPER37 VIPerPlus family: fixed frequency offline converter Datasheet - production data nd High primary current protection (2 OCP) Input undervoltage setting (brownout) Onboard soft-start Safe auto-restart after a fault condition D Q 6 3, Hysteretic thermal shutdown Applications Figure 1. Typical topology + + SMPS for set-top boxes, DVD players and DC input high voltage wide range DC Output voltage recorders, white goods - Auxiliary power supply for consumer and home DRAIN DRAIN DRAIN DRAIN DRAIN equipment VIPER37 ATX auxiliary power supply GND VDD CONT FB BR Low / medium power AC-DC adapters Description This device is an offline converter with an 800 V Features rugged power section, a PWM control, two levels of overcurrent protection, overvoltage and 800 V avalanche-rugged power MOSFET overload protection, hysteretic thermal protection, allowing ultra wide range input V to be ac soft-start, and safe auto-restart after the removal achieved of any fault condition. Burst mode operation and very low device consumption help to meet the PWM operation with adjustable limiting current standby energy saving regulations. Advance 30 mW standby power at 265 V ac frequency jittering reduces EMI filter costs. Operating frequency: Brownout function protects the switch mode 60 kHz (L type), 115 kHz (H type) power supply when the rectified input voltage level is below the normal minimum level specified Frequency jittering for low EMC for the system. The high voltage startup circuit is Output overvoltage protection embedded in the device. Table 1. Device summary Order code Package Packing VIPER37LE SDIP10 VIPER37HE Tube VIPER37HD VIPER37LD SO16 narrow VIPER37HDTR Tape and reel VIPER37LDTR July 2015 DocID022218 Rev 3 1/35 This is information on a product in full production. www.st.com 62 UURZContents VIPER37 Contents 1 Block diagram 4 2 Typical power . 4 3 Pin settings 5 4 Electrical data 6 4.1 Maximum ratings 6 4.2 Thermal data . 6 4.3 Electrical characteristics . 7 5 Typical electrical characteristics 11 6 Typical circuit . 15 7 Efficiency performances for a typical flyback converter . 16 8 Operation description . 17 8.1 Power section and gate driver . 17 8.2 High voltage startup generator . 18 8.3 Power-up and soft-start 18 8.4 Power down operation . 20 8.5 Auto-restart operation 20 8.6 Oscillator . 21 8.7 Current mode conversion with adjustable current limit set point . 21 8.8 Overvoltage protection (OVP) . 22 8.9 About the CONT pin . 23 8.10 Feedback and overload protection (OLP) 24 8.11 Burst mode operation at no load or very light load 26 8.12 Brownout protection . 27 8.13 2nd level overcurrent protection and hiccup mode 29 9 Package information 30 2/35 DocID022218 Rev 3