型號(hào)	VIPER27LN	品牌	ST
批號(hào)	20+	封裝	DIP-7
QQ	370533363

VIPER27 Off-line high voltage converters
   Features ■ 800 V avalanche rugged power section ■ PWM operation with frequency jittering for low EMI ■ Operating frequency: – 60 kHz for L type – 115 kHz for H type ■ Standby power < 50 mW at 265 Vac ■ Limiting current with adjustable set point ■ Adjustable and accurate overvoltage protection ■ On-board soft-start ■ Safe auto-restart after a fault condition ■ Hysteretic thermal shutdown Application ■ Auxiliary power supply for consumer and home equipments ■ ATX auxiliary power supply ■ Low / medium power AC-DC adapters ■ SMPS for set-top boxes, DVD players and recorders, white goods

Description The device is an off-line converter with an 800 V rugged power section, a PWM control, two levels of over-current protection, overvoltage and overload protections, hysteretic thermal protection, soft-start and safe auto-restart after any fault condition removal. Burst mode operation and device very low consumption help to meet the standby energy saving regulations. Advance frequency jittering reduces EMI filter cost. Brown-out function protects the switch mode power supply when the rectified input voltage level is below the normal minimum level specified for the system. The high voltage start-up circuit is embedded in the device

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