Double output SMPS for power line applications using the

EVLALTAIR900-M1
Double output SMPS for power line applications using
the ALTAIR04-900 primary controller
Data brief
Features
■
Universal input mains range: 90 - 264 Vac,
frequency 45 - 65 Hz
■
Double output voltage: 13 V @ 0.55 A and
3.3 V @ 100 mA peak power
■
Optoless constant voltage - constant current
output regulation
■
Meets power line communication system
specifications based on the ST7580
■
Average efficiency: > 70%
■
EMI: According to EN55022-Class-B
Description
This board implements a 7.5 W double output
wide range mains adapter with constant voltage constant current, developed to build an innovative
AC-DC adapter to supply a complete power line
communication 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 V to
supply digital circuitry and an optional external
microcontroller.
In addition, by using the primary constant current
loop (CC loop), it is possible to set the maximum
deliverable output current without any secondary
components or current sensor.
The board implements several protections 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 in auto-restart mode.
The board uses the new ALTAIR04-900, a quasiresonant (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 RDS(on), 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 still maintaining quite accurate
regulation.
December 2011
Doc ID 022633 Rev 1
For further information contact your local STMicroelectronics sales office.
1/5
www.st.com
5
EVLALTAIR900-M1
Figure 1.
Output voltage characteristic with 3V3 @ 40 mA
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Figure 2.
Output voltage characteristic with 3V3 @ 80 mA
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2XWSXWYROWDJH>[email protected]
2XWSXWFXUUHQW>[email protected]
2/5
Doc ID 022633 Rev 1
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EVLALTAIR900-M1
EVLALTAIR900-M1 electrical diagram
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Revision history
1
EVLALTAIR900-M1
Revision history
Table 1.
4/5
Document revision history
Date
Revision
23-Dec-2011
1
Changes
Initial release.
Doc ID 022633 Rev 1
EVLALTAIR900-M1
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