STEVAL-ISA133V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – Meets power line communication system specifications with the ST7580

STEVAL-ISA133V1
Double output SMPS for power line applications using the
ALTAIR04-900 primary controller
Data brief
Features
• Universal input mains range: 90 264 V_ac -
frequency 45 65 Hz
• Double output voltage: 13V @ 0.55 A and 3.3 V
@ 100 mA peak power
• Optoless constant-voltage/constant-current
output regulation
• Meets power line communication system
specifications with the ST7580
• Average efficiency: > 70%
• EMI: in accordance with EN55022-Class-B
The STEVAL-ISA133V1 demonstration board
uses the new ALTAIR04-900, a quasi-resonant
(QR) current-mode controller IC specifically
designed for QR ZVS (zero voltage switching at
switch turn-on) flyback converters, which
combines a high-performance low-voltage PWM
controller chip and a typical 16 R_DSon, 900 V,
avalanche-rugged power MOSFET in the same
package.
The device is capable of providing constant
output voltage regulation using primary-sensing
constant voltage loop (CV loop). This eliminates
the need for the optocoupler and the secondary
voltage reference while maintaining very accurate
regulation.
Also, using the primary constant current loop, it is
possible to set the maximum deliverable output
current without using secondary components or
current sensor.
The board implements several protection features
that considerably increase end-product safety
and reliability: auxiliary winding disconnection (or
brownout) detection, shorted secondary rectifier
detection, and transformer saturation protection,
all of which are auto-restart mode.
Description
The STEVAL-ISA133V1 demonstration board
implements a 7.5 W double output wide range
mains adapter with constant-voltage/constant-
current, designed as an innovative AC-DC
adapter to supply a complete power line
communication system based on the ST7580.
The power supply provides a 13 V output voltage
to supply the power line modem (PLM) and the
analog circuitry, and a post-regulated 3.3 volts to
supply digital circuitry and an optional external
microcontroller.
April 2013
DocID024356 Rev 1
www.st.com
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