©2004 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1

4

Input Characteristics

Output Characteristics

Transfer Characteristics

Notes:

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

reference input voltage,

∆V

where

∆T

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

Symbol

Parameter

Test Conditions

Device

Min.

Typ. Max.

Unit

LED Forward Voltage

All

1.5

V

Reference Voltage

FOD2741A

2.482

2.495

2.508

V

FOD2741B

2.470

2.495

2.520

V

FOD2741C

2.450

2.500

2.550

V

(4)

Temperature

All

4.5

17

mV

∆V

∆V

COMP

to the Output of the

Error Amplifier

All

-1.0

-2.7

mV/V

∆V

-0.5

-2.0

Feedback Input

Current

All

1.5

4

µA

(4)

Temperature

All

0.4

1.2

µA

All

0.45

1.0

mA

Off-state Error

Amplifier Current

All

0.05

1.0

µA

Error Amplifier Output

f

≥ 1.0 kHz

All

0.15

0.5

Ω

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Collector Dark Current

50

nA

Emitter-Collector Voltage Breakdown

7

V

Collector-Emitter Voltage Breakdown

70

V

Test Conditions

Min.

Typ.

Max.

Unit

CTR

Current Transfer Ratio

100

200

%

Voltage

0.4

V

∆V

()

V

REF DEV

25°C

=

()

{} 10

6

×

∆T

A

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

=

Z

∆V

∆I

--------Z

OUT

1

R1

R2

--------

+

×

≈