KA7541 データシートの表示（PDF） - Fairchild Semiconductor

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KA7541

Simple Ballast Controller

Fairchild Semiconductor 

Pin Assignments

KA7541

CS 1

Ct 2

RS 3

Ldet 4

(Top View)

8 VCC

7 OUT1

6 OUT2

5 GND

Pin Definitions

Pin Number

1

2

3

4

5

6

7

8

Pin Name

CS

CT

RS

Ldet

GND

OUT 2

OUT 1

VCC

Pin Function Descrition

Soft start capacitor connection pin. The pin voltage determines the phase of soft

start, normal mode.

Timing capacitor connection pin. The timing capacitor is charged and discharged

to generate the sawtooth waveform that determines the oscillation frequency in

the internal oscillator block.

Soft start resistor connection pin. The soft start resistor value determines the initial

preheating switching frequency during soft start mode.

Input to the protection circuit. If the pin voltage is lower than 2V, the output of the

gate driver is inhibited.

The ground potential of all the pins.

The output of a high-current power driver capable of driving the gate of a power

MOSFET

The output of a high-current power driver capable of driving the gate of a power

MOSFET.

The logic and control power supply connection.

3

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