Data Sheet G13418EJ3V0DS00

4

µµµµ 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