FOD2743BSD Datasheet FOD2743B, FOD2743BSDV, FOD2743BSD | P4-P6

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1 4

FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Ampliﬁer

Electrical Characteristics

(T

A

= 25°C unless otherwise speciﬁed)

Input Characteristics

Output Characteristics

Transfer Characteristics

Notes:

2. The deviation parameters V

REF(DEV)

and I

REF(DEV)

are defined as the differences between the maximum and

minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the

reference input voltage,

∆

V

REF

, is defined as:

where

∆

T

A

is the rated operating free-air temperature range of the device.

3. The dynamic impedance is defined as |Z

OUT

| =

∆

V

COMP

/

∆

I

LED

. When the device is operating with two external

resistors (see Figure 2), the total dynamic impedance of the circuit is given by:

Symbol Parameter Test Conditions Device Min. Typ. Max. Unit

V

F

LED Forward Voltage I

LED

= 1mA, V

COMP

= V

FB

(Fig.1) All 1.07 1.2 V

V

REF

Reference Voltage I

LED

= 1mA, V

COMP

= V

FB

FOD2743A 2.482 2.495 2.508 V

FOD2743B 2.470 2.495 2.520 V

FOD2743C 2.450 2.500 2.550 V

V

REF (DEV)

(2)

Deviation of V

REF

Over

Temperature

(2)

T

A

= -25°C to +85°C All 4.5 17 mV

∆

V

REF

/

∆

V

COMP

Ratio of V

REF

Variation

to the Output of the

Error Ampliﬁer

I

LED

= 1mA

∆

V

COMP

= 10V to V

REF

All -0.4 -2.7 mV/V

∆

V

COMP

= 36V to 10V -0.3 -2.0

I

REF

Feedback Input Current I

LED

= 1mA, R

1

= 10k

Ω

(Fig. 3) All 2 4 µA

I

REF (DEV)

(2)

Deviation of I

REF

Over

Temperature

T

A

= -25°C to +85°C All 1 1.2 µA

I

LED (MIN)

Minimum Drive Current V

COMP

= V

FB

(Fig.1) All 0.45 1.0 mA

I

(OFF)

Off-State Error

Ampliﬁer Current

V

LED

= 37V, V

FB

= 0 (Fig. 4) All 0.001 1.0 µA

|Z

OUT

| Error Ampliﬁer Output

Impedance

(3)

V

COMP

= V

REF

, I

LED

= 1mA to 20mA,

f

≥

1.0 kHz

All 0.15 0.5

Ω

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

CEO

Collector Dark Current V

CE

= 10V (Fig. 5) 1 50 nA

BV

ECO

Emitter-Collector Voltage Breakdown I

E

= 100µA 7 10 V

BV

CEO

Collector-Emitter Voltage Breakdown I

C

= 1.0mA 70 100 V

Symbol

Parameter

Test Conditions Min. Typ. Max. Unit

CTR Current Transfer Ratio I

LED

= 1mA, V

COMP

= V

FB

,

V

CE

= 5V (Fig. 6)

50 100 %

V

CE

(SAT)

Collector-Emitter Saturation

Voltage

I

LED

= 1mA, V

COMP

= V

FB,

I

C

= 0.1mA (Fig. 6)

0.4 V

∆V

REF

ppm/°C()

V

REF DEV()

/V

REF

T

A

25°C=(){}10

6

×

∆T

A

-----------------------------------------------------------------------------------------------------=

Z

OUT, TOT

=

∆V

∆I

--------Z

OUT

1

R1

R2

--------+×≈

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1 5

FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Ampliﬁer

Electrical Characteristics

(Continued) (T

A

= 25°C unless otherwise speciﬁed)

Isolation Characteristics

Switching Characteristics

Notes:

4. Device is considered as a two terminal device: Pins 1,2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are

shorted together.

5. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge

of the common mode impulse signal, Vcm, to assure that the output will remain high. Common mode transient

immunity at output low is the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse

signal,Vcm, to assure that the output will remain low.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

I-O

Input-Output Insulation

Leakage Current

RH = 45%, T

A

= 25°C, t = 5s,

V

I-O

= 3000 VDC

(4)

1.0 µA

V

ISO

Withstand Insulation

Voltage

RH ≤ 50%, T

A

= 25°C, t = 1 min.

(4)

5000 Vrms

R

I-O

Resistance (Input to Output) V

I-O

= 500 VDC

(4)

10

12

Ω

Symbol Parameter Test Conditions Min. Typ. Max. Unit

BW Bandwidth (Fig. 7) 50 kHZ

CMH Common Mode Transient

Immunity at Output HIGH

I

LED

= 0mA, Vcm = 10 V

PP

,

R

L

= 2.2kΩ

(5)

(Fig. 8)

1.0 kV/µs

CML Common Mode Transient

Immunity at Output LOW

(I

LED

= 1 mA, Vcm = 10 V

PP,

R

L

= 2.2 kΩ

(5)

(Fig. 8)

1.0 kV/µs

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1 6

FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Ampliﬁer

Test Circuits

I

(LED)

V

(LED)

V

COMP

V

COMP

I

CEO

V

CE

V

REF

V

CE

I

(LED)

V

F

V

REF

V

REF

17

6

7

6

V

2

4

3

I

(LED)

I

(LED)

I

C

I

(OFF)

I

REF

1

2

7

6

7

6

7

6

V

4

3

1

2

4

3

1

2

4

3

1

2

7

6

4

3

R1

1

2R1

R2

4

3

Figure 1. V

REF

, V

F,

I

LED

(min.) Test Circuit

Figure 3. I

REF

Test Circuit

Figure 5. I

CEO

Test Circuit Figure 6. CTR, V

CE(sat)

Test Circuit

Figure 4. I

(OFF)

Test Circuit

Figure 2. ∆V

REF /

∆V

COMP

Test Circuit

FOD2743BSD

FOD2743BSD

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