FOD2743BSD Datasheet FOD2743B, FOD2743BSDV, FOD2743BSD | P7-P9

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1 7

FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Ampliﬁer

Test Circuits (Continued)

6

7

8

5

1

4

2

A

B

3

6

5

7

8

2

3

4

1

V

CC

= +5V DC

V

CC

= +5V DC

I

F

= 1mA

I

F

= 0mA (A)

I

F

= 1mA (B)

V

IN

0.47V

0.1 V

PP

47Ω

V

OUT

V

OUT

VCM

10V

P-P

R1

2.2kΩ

R

L

1µF

+

_

Figure 7. Frequency Response Test Circuit.

Figure 8. CMH and CML Test Circuit

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1 8

FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Ampliﬁer

Typical Performance Curves

Fig. 10 – Reference Voltage Variation vs. Ambient Temperature

∆V

REF

– REFERENCE VOLTAGE VARIATION (%)

T

A

= 25°C

V

COMP

= V

FB

T

A

– AMBIENT TEMPERATURE (°C)

T

A

– AMBIENT TEMPERATURE (°C)

Fig. 9a – LED Current vs. Cathode Voltage

I

LED –

SUPPLY CURRENT (mA)

I

LED –

SUPPLY CURRENT (mA)

I

REF –

REFERENCE CURRENT (µA)

-15

-10

-5

0

5

10

15

-1 0 1 2

V

COMP

– CATHODE VOLTAGE (V)

3

Fig. 9b – LED Current vs. Cathode Voltage

Fig. 11 – Reference Current vs Ambient Temperature

-1.0

-0.5

0.0

0.5

1.0

–1 0 1 2

V

COMP

– CATHODE VOLTAGE (V)

3

T

A

= 25°C

V

COMP

= V

FB

T

A

– AMBIENT TEMPERATURE (°C)

-40 -20 0 20 40 60 80 100

I

OFF

– OFF–STATE CURRENT (nA)

1

10

100

Fig. 12 – Off–State Current vs. Ambient Temperature

V

CC

= 37V

V

F

– FORWARD VOLTAGE (V)

I

F

– FORWARD CURRENT (mA)

5

0.9 1.0 1.1 1.2

70°C

25°C

0°C

1.3 1.4

10

15

20

Fig. 13 – Forward Current vs. Forward Voltage

-40 -20 0 20 40 60 80 100

1.0

1.5

2.0

2.5

3.0

3.5

4.0

I

LED

= 1mA, 10mA

R1 = 10kΩ

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

I

LED

= 1mA, 10mA

Normalized to T

A

= 25°C

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1 9

FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Ampliﬁer

Typical Performance Curves (Continued)

T

A

– AMBIENT TEMPERATURE (°C)

T

A

– AMBIENT TEMPERATURE (°C)

V

CE

– COLLECTOR-EMITTER VOLTAGE (V)

I

LED

– FORWARD CURRENT (mA)

0.1 1 10

(I

C

/I

F

) – CURRENT TRANSFER RATIO (%)

20

0

40

60

80

100

120

140

160

I

C

– COLLECTOR CURRENT (mA)

I

LED

= 5, 10, 20mA

-40 -20 0 20 40 60 80 100

I

CEO

– DARK CURRENT (nA)

0.1

1

10

100

1000

10000

012345678910

I

C

– COLLECTOR CURRENT (mA)

0

5

10

15

20

25

30

35

Fig. 15 – Collector Current vs. Ambient Temperature

Fig. 14 – Dark Current vs. Ambient Temperature

Fig. 18 – Collector Current vs. Collector Voltage

Fig. 16 – Current Transfer Ratio vs. LED Current

V

CE

= 10V

T

A

= 25°C

I

LED

= 20mA

I

LED

= 10mA

I

LED

= 5mA

I

LED

= 1mA

Fig. 17 – Saturation Voltage vs. Ambient Temperature

V

CE(sat)

– SATURATION VOLTAGE (V)

-40 -20 0 20 40

T

A

– AMBIENT TEMPERATURE (°C)

60 80 100

TEMPERATURE (°C)

DELTA Vref / DELTA Vout ( mV/V)

-0.32

-0.34

-0.36

-0.38

-0.40

-0.42

-0.44

-0.46

-60 -40 -20 0 20 40 60 80 100 120

Fig. 19 – Rate of Change Vref to Vout vs. Temperature

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0.22

0.24

0.26

I

LED

= 10mA

I

C

= 2.5mA

I

LED

= 1mA

I

C

= 0.1mA

-40 -20 0 20 40 60 80 100

0

4

8

12

16

20

24

28

32

I

C

– COLLECTOR CURRENT (mA)

I

LED

= 1mA

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

I

LED

= 5mA

I

LED

= 10mA

I

LED

= 1mA

I

LED

= 20mA

V

CE

= 5V

V

CE

= 5V

25°C

0°C

-40°C

100°C

70°C

FOD2743BSD

FOD2743BSD

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