STEVAL-ISA105V1

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 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 quasiresonant 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 avalancherugged 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 www.st.com 4 . , $ . /04)/.!, . $ $ . $    $2!). Doc ID 023539 Rev 1 '.$ ),%$ #/-0 $2!).  2 % 2 $.,    2 + 3/52#% # N& # N& 5 344(! $ 3/52#% # N&  $2!). # N& $-' % 2 2 +7  !,4!)2  . $ 2 - 2 - 2 - 2 -  $2!). 2 +  # U&6 # U&6 # U&6  2 + # N& # N&6 # N&6          N& 9#AP # 42 3403(! $ 3403(! $ 3403(! $ U&6,OW%32 + 2  "2 -"3  U&6,OW%32 . -/6  3/+6  M( , # #     , # 2 % 6 6 #  # N& "90 N& "90 /54 #   ,$!-2 ).( ). 5 M( ).( 5 ,$!-2  ). /54 '.$ U&6,OW%32  # N& U&6,OW%32 6## 2/4  # # # N& 2 + # N& 2 + 2 + '.$ 6 '.$ 6 '.$?ISO 6?ISO Figure 1. '.$ 1  2 %7 Schematic diagram STEVAL-ISA105V1 Schematic diagram Schematic diagram U&6,OW%32 U&6,OW%32  $0Y STEVAL-ISA105V1 2 Revision history Revision history Table 1. Document revision history Date Revision 06-Aug-2012 1 Changes Initial release. Doc ID 023539 Rev 1 3/4 STEVAL-ISA105V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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