VIPER26

VIPER26 Fixed frequency VIPerTM plus family 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 ■ On-board soft-start ■ Safe auto-restart after a fault condition ■ Hysteretic thermal shutdown Application ■ Auxiliary power supply for appliances ■ Power metering ■ LED drivers ■ SMPS for set-top boxes, DVD players and recorders SO16 narrow SO-16 Description DIP-7 The device is an off-line converter with an 800 V avalanche ruggedness power section, a PWM controller, user defined overcurrent limit, protection against feedback network disconnection, hysteretic thermal protection, soft start up and safe auto restart after any fault condition. Advance frequency jittering reduces EMI filter cost. Burst mode operation and the devices very low consumption both help to meet the standard set by energy saving regulations. Figure 1. Typical topology (VOUT ≤VDDCSon) DC Input Voltage DC Output Voltage - DRAIN COMP VIPER26 GND VDD LIM FB Table 1. Device summary Order codes VIPER26LN VIPER26HN VIPER26HD VIPER26HDTR VIPER26LD VIPER26LDTR September 2010 Package DIP-7 SO16 narrow Doc ID 17736 Rev 2 Packaging Tube Tube Tape and reel Tube Tape and reel 1/25 www.st.com 25 Contents Contents VIPER26 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....