TL494 Просмотр технического описания (PDF) - Motorola => Freescale

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производитель

TL494

SWITCHMODE PULSE WIDTH MODULATION CONTROL CIRCUIT

Motorola => Freescale 

TL494

Figure 1. Representative Block Diagram

6

RT

5

CT

4

Deadtime

Control

Oscillator

0.12V

0.7V

0.7mA

+

1

–

Deadtime

Comparator

–

+

–

+

PWM

Comparator

+

2

–

Output Control

13

DQ

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.

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

VCC

8

Q1

9

Q2 11

10

12

VCC

4

MOTOROLA ANALOG IC DEVICE DATA

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