L4990 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L4990

PRIMARY CONTROLLER

STMicroelectronics 

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Figure 35. Bipolar Transistor Drive

L4990 - L4990A

VIN

VCC

VC

8

9

L4990

10 OUT

ISEN

13

11

PGND

D97IN506

Figure 36. Typical E/A compensation networks.

From VO

Ri

Rd Cf

+

2.5V

1.3mA

VFB 5

Rf

+

-

EA

2R

R

COMP 6

12

SGND

Error Amp compensation circuit for stabilizing any current-mode topology except

for boost and flyback converters operating with continuous inductor current.

From VO

RP

Ri

CP

Rd Cf

+

2.5V

1.3mA

VFB 5

Rf

+

-

EA

2R

R

COMP 6

12

SGND D97IN507

Error Amp compensation circuit for stabilizing current-mode boost and flyback

topologies operating with continuous inductor current.

19/24

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