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STEVAL-ISA119V1
1.5 W double output buck demonstration board based on the
VIPER16LD
Data brief
Description
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 Vac) while in the latter case, the cost and
complication of the IC supply network may be
reduced.
Features
• Input voltage range (VIN): 90 VRMS to 265
VRMS
• Output voltage 1 (VOUT1) = 12 V
• Max output current 1: (IOUT1) = 0.1 A
• Output voltage 2: (VOUT2) = 5 V (through LDO)
• Max output current 2: (IOUT2)= 0.05 A
• Precision of output regulation ΔVOUT_LF = ±5%
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.
• High frequency output voltage ripple
ΔVOUT_HF = 50 mV
• Max ambient operating temperature TA = 60 °C
June 2013
DocID024486 Rev 1
For further information contact your local STMicroelectronics sales office.
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www.st.com
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Schematic diagram
1
STEVAL-ISA119V1
Schematic diagram
Figure 1. STEVAL-ISA119V1 circuit schematic
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Revision history
Revision history
Table 1. Document revision history
Date
Revision
18-Jun-2013
1
Changes
Initial release.
DocID024486 Rev 1
3/4
STEVAL-ISA119V1
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