TL494 查看數據表（PDF） - Motorola => Freescale

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TL494

SWITCHMODE PULSE WIDTH MODULATION CONTROL CIRCUIT

Motorola => Freescale 

R1

Vref

R2

TL494

Figure 14. Error–Amplifier Sensing Techniques

VO To Output

Voltage of

System

1

+

Error

Amp

3

–

2

Positive Output Voltage

VO = Vref

1+

R1

R2

1

+

Error

Amp

–

2

Negative Output Voltage

VO = Vref

R1

R2

Vref

R2

R1

VO

To Output

Voltage of

System

Figure 15. Deadtime Control Circuit

Output

Control

Output

Q

RT

6

Vref

R1

4

DT

CT

R2

5

30k

0.001

Figure 16. Soft–Start Circuit

Output

Q

Vref

CS

4

DT

RS

Max. % on Time, each output ≈ 45 –

80

1

+

R1

R2

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

Output

Control

0 ≤ VOC ≤ 0.4 V

C1

Q1 E1

Single–Ended

C2

Q2 E2

QC

1.0 mA to

500 mA

QE

2.4 V ≤ VOC ≤ Vref

Output

Control

C1

Q1 E1

1.0 mA to 250 mA

Push–Pull

C2

Q2 E2

1.0 mA to 250 mA

8

MOTOROLA ANALOG IC DEVICE DATA

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