STEVAL-ISA105V1 datasheet(1/4 Pages) STMICROELECTRONICS

Part #	STEVAL-ISA105V1

Description	RoHS compliant

PDF	4 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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This is information on a product in full production.

August 2012

Doc ID 023539 Rev 1

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STEVAL-ISA105V1

Power supply for energy meter and power line modem

based on the ALTAIR04-900

Databrief

Features

■ Min. operating voltage Vacmin: 90 Vac

■ Max. operating voltage Vacmax: 265 Vac, 440

Vmax

■ Topology: quasi-resonant flyback converter,

primary side regulation

■ Mains frequency fL: 50 Hz +/-3 Hz

■ Input/output isolation: yes, Galvanic isolation

>2.7 KV

■ Nominal output voltage:

– 5 V/70 mA nominal, 1 A max.

– 3.3 V/30 mA nominal, 150 mA max.

– 12 V/2 mA nominal, 100 mA max.

– 5 V_ISO/2 mA nominal, 80 mA max.

■ Total output power Pout: 1 W nominal, 7.5 W

(during transmission mode)

■ Typical efficiency @ 230 Vac: > 75%

■ Output voltage pk-pk ripple: < 100 mV

■ Protection: short-circuit protection

■ Reflected voltage of transformer, VR: 100 V

■ RoHS compliant

Description

The STEVAL-ISA105V1 demonstration board

implements a power supply based on a quasi-

resonant mode of operation using ST primary

side ALTAIR04-900 flyback switch.

The ALTAIR04-900 is a high-voltage all-primary

sensing switcher intended for operating directly

from the rectified mains with minimum external

parts. It combines a high-performance low voltage

PWM controller chip and a 900 V avalanche-

rugged power section in the same package.

The controller is a current-mode specifically

designed for offline quasi-resonant flyback

converters. The device is capable of providing

constant output voltage using all primary sensing

feedback. This eliminates the need for the

optocoupler, the secondary voltage reference, as

well as the current sensor, while still maintaining

quite accurate regulation.

www.st.com

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