TL494CN データシートの表示（PDF） - ON Semiconductor

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TL494CN

SWITCHMODE™ Pulse Width Modulation Control Circuit

ON Semiconductor 

TL494, NCV494

6

RT

5

CT

4

Deadtime

Control

Oscillator

0.12V

0.7V

0.7mA

Deadtime

Comparator

−

+

−

+

PWM

Comparator

+

+

1

2

−

−

Output Control

13

D

Q

Flip−

Flop

Ck Q

−

+ 4.9V

UV

Lockout −

+

3.5V

Reference

Regulator

12

Error Amp

1

3

Feedback PWM

Comparator Input

15 16

Error Amp

2

14

7

Gnd

Ref.

Output

This device contains 46 active transistors.

Figure 1. Representative Block Diagram

VCC

8

Q1

9

Q2 11

10

12

VCC

Capacitor CT

Feedback/PWM Comp.

Deadtime Control

Flip−Flop

Clock Input

Flip−Flop

Q

Flip−Flop

Q

Output Q1

Emitter

Output Q2

Emitter

Output

Control

Figure 2. Timing Diagram

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5

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