19 几种常用的光耦反馈电路应用 13页

1

TLP521 PC817 TLP521

TLP521 If Ic Ic If “ ” TL431 TLP521 TL431 2.5 V 1 3

1 1 Vo Vd com PWM ( UC3525) com

1 TL431 1 ( ) 3 ( ) TLP521 If Ic R4 com

2 2 1 4 —— ( ) PWM

2 If Ic Ic com

3 3 1 3 R6 TL431 TL431 R3 R6 1

4 4 2 com 4 R4 3 R62

2

TLP521 Ic-Vce 5 6

5 6 If 5 mA If Ic Vce If 5 mA 5 10 mA

Ic-If 7

7 If 10 mA Ic-If If 10 mA Ic-If If If () Ic-If If Ic Ic-If 7 Ic-Ta ( 8 )

8 If 5 mA Ic-Ta

1 R4 If 10 mA 0 100 20 15 mA PWM 3 V R4 670 TL431 3 1

2 V R

3 560 R1 R2 27 k 4.

7 k R5 C1 PI 3 k 10 nF

30 w 4 ( ) 9 10

10 0.7

2 3 mA Ic 3 mA 7 Ib 2 mA 6 Ib Ib Ic 4 Ic ( 3 mA) Ib 6 Ib

2 1 4 4 ( UC3525 ) 11 2

2 Ic

412 13 0.2

1 3

2 4

3

4

6N137 850 nm AlGaAs LED LSTTL/TTL ( 10MBd) 5mA

10MBit/s;

10kV/us;

8;

;

;

250uA 15mA ( ) 0.8v Vcc 5.5V (TTL ) 8 ( ) -40°C to +85°C A/D

6N137 1

6N137 1

6N137

H H L

L H H

H L H

L L H

H NC L

L NC H

6N137 — 0.1uF 6N137

6N137 6N137 6 Vo 6N137 2 3 LED

6N137 850 nm AlGaAs LED LSTTL/TTL ( 10MBd) 5mA

10MBit/s;

10kV/us;

8;;

;

250uA 15mA ( ) 0.8v Vcc 5.5V (TTL ) 8 ( ) -40°C to +85°C A/D

6N137 1

6N137 1

6N137

H H L

L H H

H L H

L L H

H NC L

L NC H

6N137 — 0.1uF 6N137

6N137 6N137 6 Vo 6N137 2 3 LED

6N137 850 nm AlGaAs LED LSTTL/TTL ( 10MBd) 5mA

10MBit/s;

10kV/us;

8;

;

;

250uA

15mA

( ) 0.8v

Vcc

5.5V

(TTL ) 8 ( )

-40°C to +85°C

A/D

6N137 1

6N137 1

6N137

H H L

L H H

H L H

L L H

H NC L

L NC H

6N137 — 0.1uF 6N137

6N137 6N137 6 Vo 6N137 2 3 LED

------------------------------------------------------------

6N137

6N137 1 2 3 -

2 2 3

3 26N137

H H L

L H H

H L H

L L H

2 I II A B RF 0-250uA 1.2-1.7V 6.5-15mA B TTL Vcc 5V RF 500 6N137 Vcc1 - 100mV A/D RF

II Vcc2=4.5-5.5V Vcc2 8 5 0.1uF 5 8 7 0-0.8V 2.0V-Vcc2

6 RL 13mA 6N13

7 4.7k TTL 1 2 47k 15k CL RL RL=350 CL=15pF 48-75ns 6N137 60pF

6N137

AD AD AD AD AD AD

1000 12 500KB/s AD 500. 6N137 AD 3

±15V AD +5V +5V +15V DC-DC AD 6N137 AD 12 6N137 3 470 47k 6N137 8 5 0.1uF 6N137 6N137 AD 6N137 6N137 50ns6N137

, 14, 2009 19:59

MAJI

6N137 6N137 45ns , TTL 10Mbps 10kV/ ,6N137 ,

1:N.C. 2:Anode 3:Cathode 4:N.C. 5:GND 6:Output(Open collector 7:Enable 8:VCC

6N137

6N137

6N137 II RF 0-250 1.2-1.7V 1.4V 6.3-15mA TTL Vcc 5V RF 500 6N137 Vcc1

100mV RF

II Vcc2=4.5 5.5V Vcc2 0.1 1cm 0-0.8V 2.0V-Vcc2

RL 13mA 6N137 4.7k TTL 47k 15k CL RL RL=350 CL=15pF 25-75ns