UPC1935 Просмотр технического описания (PDF) - NEC => Renesas Technology
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UPC1935 Datasheet PDF : 28 Pages
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µ PC1935
CONTENTS
1. ELECTRICAL SPECIFICATIONS ................................................................................................................ 5
2. CONFIGURATION AND OPERATION OF EACH BLOCK.................................................................... 11
2.1 Reference Voltage Generator ...........................................................................................................................12
2.2 Oscillator ...........................................................................................................................................................12
2.3 Under Voltage Lock-out Circuit ........................................................................................................................12
2.4 Error Amplifiers.................................................................................................................................................12
2.5 PWM Comparators............................................................................................................................................12
2.6 Timer Latch-Method Short Circuit Protection Circuit ....................................................................................13
2.7 Output Circuit....................................................................................................................................................13
3. NOTES ON USE........................................................................................................................................ 14
3.1 Setting the Output Voltage ...............................................................................................................................14
3.2 Setting the Oscillation Frequency ...................................................................................................................15
3.3 Preventing Malfunction of the Timer Latch-Method Short Circuit Protection Circuit..................................15
3.4 Connecting Unused Error Amplifiers ..............................................................................................................16
3.5 ON/OFF Control.................................................................................................................................................17
3.5.1 Channel 1 (for step-up) ............................................................................................................................17
3.5.2 Channel 2 (for step-up) ............................................................................................................................18
3.5.3 Channel 3 (for inverted output) ................................................................................................................19
3.6 Maximum Duty Limit .........................................................................................................................................20
3.7 Notes on Actual Pattern Wiring........................................................................................................................20
4. APPLICATION EXAMPLE ......................................................................................................................... 21
4.1 Application Example.........................................................................................................................................21
4.2 List of External Parts ........................................................................................................................................22
5. PACKAGE DRAWING ................................................................................................................................ 23
6. RECOMMENDED SOLDERING CONDITIONS ....................................................................................... 24
4
Data Sheet G13418EJ3V0DS00
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