L6565 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L6565

QUASI-RESONANT SMPS CONTROLLER

STMicroelectronics 

L6565

Figure 24. Primary Feedback loop configurations

Vcc

COMP

8

2

RH

1

INV

RL

-

E/A

+

2.5V

GND 6

L6565

to VFF

block

a)

Vcc

COMP

8

2

RH

1

INV

RL

-

E/A

+

2.5V

GND 6

L6565

to VFF

block

b)

Figure 25. Protection against secondary

feedback disconnection by primary

regulation take-over

2.2 kΩ

15 V

INV 1

Vcc

8

L6565

2

COMP

Figure 27. Remote ON/OFF control

OFF

ON

L6565

5

ZCD

BC337

Figure 26. Leading edge blanking circuit for

enhanced primary regulation

BC327 1N4148

470 pF

2.7 kΩ

Vcc

L6565

GND

Figure 28. Low-consumption start-up circuit

Vac

+Vin

R

CSTART 1N4148

1N4148

Vcc

8

L6565

6

GND

CSUPPLY

RELATED DOCUMENTATION

[1] "L6565, QUASI-RESONANT CONTROLLER” (AN1326)

[2] “25W QUASI-RESONANT FLYBACK CONVERTER FOR SET-TOP BOX APPLICATIONS USING THE

L6565” (AN1376)

[3] “EVAL6565N, 30W AC-DC ADAPTER WITH THE L6565 QUASI-RESONANT PWM CONTROLLER”

(AN1439).

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