STEVAL-ISA105V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – RoHS compliant

STEVAL-ISA105V1
Power supply for energy meter and power line modem
based on the ALTAIR04-900
Databrief
Features
■ Min. operating voltage V_acmin: 90 V_ac
■ Max. operating voltage V_acmax: 265 V_ac, 440
V_max
■ 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 P_out: 1 W nominal, 7.5 W
(during transmission mode)
■ Typical efficiency @ 230 V_ac: > 75%
■ Output voltage pk-pk ripple: < 100 mV
■ Protection: short-circuit protection
■ Reflected voltage of transformer, V_R: 100 V
■ RoHS compliant
feedback. This eliminates the need for the
optocoupler, the secondary voltage reference, as
well as the current sensor, while still maintaining
quite accurate regulation.
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
August 2012
This is information on a product in full production.
Doc ID 023539 Rev 1
1/4
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