STMicroelectronics VIPER01 | Demoboard AN4855

Description

The STEVAL-ISA77V1 is a 5 V/4.25 W power supply set in non-isolated flyback topology using the new and innovative VIPer01 IC for building smart power supplies with green energy management.The STEVAL-ISA77V1 board features: Five-star energy efficiency rating under no load operation (PIN_no_load < 10 mW @ 230 VAC) Compliance with the 10 % load efficiency and 4-point average active-mode efficiency targets prescribed by European CoC ver. 5 Tier 2 Compliance with IEC55022 Class B conducted EMI, even with reduced EMI filter RoHS compliance

Features

an 800 V avalanche rugged power MOSFET

• Embedded HV start-up
• Pulse frequency modulation (PFM) and ultra-low stand-by consumption of the internal circuitry under light load condition
• 60 kHz fixed switching frequency with jittering
• On-board transconductance error amplifier internally referenced to 1.2 V ± 2%
• Self-supply option to avoid auxiliary winding and bias components
• Current mode PWM controller with drain current limit protection to facilitate compensationThese features facilitate complete system design with minimum component count.Enhanced system reliability is ensured by the built-in soft start function and the following protections:
• Pulse skip mode to avoid flux-runaway
• delayed overload protection (OLP)
• max duty cycle counter
• VCC clamp
• Input overvoltage protection
• thermal shutdownExcept for pulse-skip mode, all protections involve auto restart mode.

More information

• Datasheet
• IC product information