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AN2864 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN2864
Description  VIPER17L demonstration board with wide-range
Download  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2864 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2864
2/29
Doc ID 15282 Rev 1
Contents
1
Tips for reducing the standby consumption . . . . . . . . . . . . . . . . . . . . . 5
1.1
Reduction of circuitry consumption at the secondary side control loop . . . 5
1.2
Burst mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3
VIPER17L consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
STEVAL-ISA058V1 board description . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
Schematic and bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Testing the board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
Typical board waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2
Precision of the regulation and output voltage ripple . . . . . . . . . . . . . . . . 12
3.3
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4
Light load performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.5
Overload protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.6
Secondary winding short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . 22
3.7
Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.8
EMI measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28


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