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VIPER20A-E Datasheet(PDF) 2 Page - STMicroelectronics

Part No. VIPER20A-E
Description  SMPS primary I.C.
Download  34 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER20A-E Datasheet(HTML) 2 Page - STMicroelectronics

 
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Contents
VIPer20A-E
2/34
Contents
1
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1
Drain pin (Integrated Power MOSFET drain): . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2
Source pin: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3
VDD pin (power supply): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4
Compensation pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5
OSC pin (oscillator frequency): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Typical circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1
Current mode topology: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2
Stand-by mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3
High voltage start-up current suorce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4
Transconductance error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.5
External clock synchronization: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.6
Primary peak current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.7
Over-temperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.8
Operation pictures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15


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