TL494

8

MOTOROLA ANALOG IC DEVICE DATA

Figure 14. Error–Amplifier Sensing Techniques

Figure 15. Deadtime Control Circuit

Figure 16. Soft–Start Circuit

Figure 17. Output Connections for Single–Ended and Push–Pull Configurations

VO

To Output

Voltage of

System

R1

1

2

Vref

R2

+

Error

Amp

Positive Output Voltage

VO = Vref

1 +

R1

3

+

1

2

Vref

R2

VO

R1

Negative Output Voltage

–

To Output

Voltage of

System

Error

Amp

–

VO = Vref

R1

R1

R2

Output

Control

Output

Q

RT

CT

DT

Vref

4

5

6

0.001

30k

R1

R2

Max. % on Time, each output

≈ 45 –

80

1 +

Output

Q

Vref

4

DT

CS

RS

Output

Control

Single–Ended

Q1

Q2

QC

1.0 mA to

500 mA

QE

2.4 V

≤ VOC ≤ Vref

Push–Pull

Q1

Q2

C1

E1

C2

E2

1.0 mA to 250 mA

1.0 mA to 250 mA

Output

Control

0

≤ VOC ≤ 0.4 V

C1

E1

C2

E2

R2

R2