UPC1935 查看數據表（PDF） - NEC => Renesas Technology

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UPC1935

DC-DC CONVERTER CONTROL IC

NEC => Renesas Technology 

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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