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AN3399 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN3399
Description  L99PM62GXP external voltage regulation
PDF  24 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3399 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN3399
2/24
Doc ID 018824 Rev 2
Contents
1
Voltage regulation circuit schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
Regulation with external PNP without current limitation . . . . . . . . . . . . . . . 5
1.2
Regulation with external NPN without current limitation . . . . . . . . . . . . . . . 6
1.3
Voltage regulation and current limitation with external PNP . . . . . . . . . . . . 7
1.4
Voltage regulation and current limitation with external NPN . . . . . . . . . . . 8
2
Evaluations of circuit with PNP and current limitation . . . . . . . . . . . . . 9
2.1
Static characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.1
Standby current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.2
Line regulation 6-18 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.3
Load regulation up to 250 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2
Dynamical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2.1
V3 switching ON / OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2.2
Load switch ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.3
Influence of Ci and C1 on the V3 switch and load variation response . . 14
2.2.4
VS cranking measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Appendix A
Reference document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23



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