KA7540 View Datasheet(PDF) - Samsung

Part Name

Description

Manufacturer

KA7540

Simple Dimming Ballast Control IC

Samsung 

KA7540

Internal Block Diagram

CS

6.8µF

1

25µA

VZ

−

+

17µA IS

Vref

VZ

2V Ref

Internal

bias

UVLO

1.8V +

UVLO

−

12.5V

Ct

180pF

Oscillator

Ict

+

IC

2

latch + +

Q

8Ict

F.D

Vdim 3

VCC Id

80kΩ 100µA

Vd

3pF

20kΩ

from VCS

+

−

kVref

Ldet 4

40kΩ

VZ

25µA

−

5pF

+

Shut down signal

2V

Frequency

divider

IS = 17µA × (Vref − VSS) / Vref

Id = 25µA × (Vref − Vd) / Vref

8 VCC

7 OUT 1

6 OUT 2

5 GND

IC Characteristics

Parameter

Initial soft start frequency

Voltage controlled dimming

KA7540

1.33 × normal operating frequency

1 ~ 10V

2

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