L4990 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L4990

PRIMARY CONTROLLER

STMicroelectronics 

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L4990 - L4990A

Figure 37. Feedback with optocoupler

L4990

COMP

6

5

VFB

Figure 38. Slope compensation techniques

VOUT

TL431

D97IN508

I

RSLOPE

RSENSE

VREF

RT

RCT

CT

ISEN

4

2

L4990

13

12

SGND

OPTIONAL

VREF

4

RT

RCT

2

CT

I

RSLOPE

ISEN

L4990

13

12

RSENSE

SGND

OUT

10

R

R

L4990

13

12

SGND

ISEN

RSLOPE

CSLOPE

RSENSE

OPTIONAL

D97IN509A

OPTIONAL

Figure 39. Protection against overvoltage/feedbackdisconnection (latched)

RSTART

VCC

8

DIS

14 L4990

12

11

SGND PGND

D97IN510

20/24

RSTART

VZ

VCC

8

DIS

14 L4990

2.2K

12

11

SGND PGND

D98IN904

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