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| The new VIPER53E includes a PWM driver, an MDmesh MOSFET, a start-up high voltage current source and several on-chip protection circuits. The VIPER53E is an alternative choice to the VIPer53 when only the secondary regulation is required in a power supply. Like the standard VIPer53, the new version is housed in surface mounting DIP-8 and PowerSO-10 packages. The higher V DD voltage range brings flexibility in designing the transformer. In fact in secondary regulation VIPER53E V DD voltage extends from 9V to 18V, while in the VIPer53 it goes from 9V to 14.5V and this wide voltage range can follow fast load variations. The extended V DD is implemented by eliminating an internal error amplifier. Thanks to the MDmesh MOSFET with a breakdown voltage of 620V, an R DS(on) of 1 at 25C and a typical handling output power of 40W for a 85 to 265Vac voltage mains. For this level of power the device does not require a heat-sink. The total power consumption of the converter is less than 0.5W for the system when working in stand-by mode. This means power supply designers can easily meet the Blue Angel Eco or Energy Star Program. Automatic burst mode for very low consumption in stand-by conditions (less than 500mW); Integrated high voltage start-up current source; Overload and short circuit control; Over-voltage protection at 18V; Over-temperature shutdown; Under-voltage protection; Current mode control with adjustable drain current limitation; Externally set switching frequency, up to 300kHz. OSC DRAIN ON/OFF oscillator PWM Latch VIPER53E blanking time selection 1V 0.5V 150/400ns blanking 8V 4V HCOMP P/N VIPER53EDIP VIPER53ESP Input Mains 195-265Vac 85-265Vac 50W 65W 30W 40W UVLO comparator VDD 8.4/ 11.5V overtemp detector R1 S R2 FF Q R3 R4 R5 standby comparator 0.5V current amplifier PWM comparator 125k 4.35V overvoltage comparator 18V overload comparator 4.5V Although the main application of VIPER53E is in AC/DC converters for consumer equipment such as set-top boxes, DVDs, VCRs, it can also be used for stand-by power supplies for servers or in home appliances where a very efficient AC/DC power supply in buck topology is needed. www.st.com/vipower TOVL COMP SOURCE VIPER53E general block diagram |
Price & Availability of VIPER53E
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