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1.5W dual output buck demonstration board based on VIPER16LD

STEVAL-ISA119V1

Overview

The STEVAL-ISA119V1 is a dual output buck demonstration board using the VIPER16LD, a new off-line high voltage converter by STMicroelectronics which has been specifically developed for non-isolated SMPS.

Output regulation is easily achieved through a voltage divider to the output voltage.
The VIPER16LD can work with or without an external supply. In the former case, very low standby consumption is possible(< 50 mW at 265 V_ac) while in the latter case, the cost and complication of the IC supply network may be reduced.
The other features of the device include an 800 V avalanche-rugged power section, PWM operation at 60 kHz with frequency jittering for lower EMI, limiting current with adjustable set point, on-board soft-start and safe auto-restart after a fault condition.
The available protection features are thermal shutdown with hysteresis and delayed overload protection.

Main features

Input voltage range (V_IN): 90 V_RMSto 265 V_RMS
Output voltage 1 (V_OUT1)= 12 V
Max output current 1: (I_OUT1) = 0.1 A
Output voltage 2: (V_OUT2) = 5 V (through LDO)
Max output current 2: (I_OUT2)= 0.05 A
Precision of output regulation ΔV_{OUT_LF}= ±5%
High frequency output voltage ripple ΔV_{OUT_HF}= 50 mV
Max ambient operating temperature T_A= 60 °C

Design Files

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Update:2025-07-03 20:18:29

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