FOD2741C datasheet(3/15 Pages) FAIRCHILD

部品番号	FOD2741C

部品情報	OPTICALLY ISOLATED ERROR AMPLIFIER

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3 / 15 page

12/9/04

Page 3 of 15

OPTICALLY ISOLATED

ERROR AMPLIFIER

FOD2741A

FOD2741B

FOD2741C

1. The deviation parameters VREF(DEV) and IREF(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,

∆VREF,

is deﬁned as:

where

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

2. The dynamic impedance is deﬁned as |ZOUT| = ∆VCOMP/∆ILED. When the device is operating with two external resistors (see

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

ELECTRICAL CHARACTERISTICS (TA = 25°C Unless otherwise speciﬁed.)

INPUT CHARACTERISTICS

Parameter

Test Conditions

Symbol

Device

Min.

Typ.

Max.

Unit

LED Forward Voltage

(ILED = 10 mA, VCOMP = VFB) (ﬁg.1)

VF

ALL

1.5

V

Reference Voltage

ILED = 10 mA, VCOMP = VFB

VREF

A

2.482

2.495

2.508

V

B

2.470

2.495

2.520

V

C

2.450

2.500

2.550

V

Deviation of VREF over

temperature

TA = -25°C to +85°CVREF (DEV)

ALL

4.5

17

mV

Ratio of VREF variation to the

output of the error ampliﬁer

ILED = 10 mA

∆VCOMP = 10V to VREF

∆VREF/

∆VCOMP

ALL

-1.0

-2.7

mV/

V

∆VCOMP = 36V to 10V

-0.5

-2.0

Feedback Input Current

ILED = 10mA, R1 = 10kΩ (ﬁg 3)

IREF

ALL

1.5

4

µA

Deviation of IREF over

temperature

TA = -25°C to +85°CIREF (DEV)

ALL

0.4

1.2

µA

Minimum Drive Current

VCOMP = VFB (ﬁg.1)

ILED (MIN)

ALL

0.45

1.0

mA

Off-state error ampliﬁer current

VLED = 37V, VFB = 0 (ﬁg 4.)

I(OFF)

ALL

0.05

1.0

µA

Error ampliﬁer output impedance

(see note 2)

VCOMP = VREF, ILED = 1mA to 20mA,

f

≥ 1.0 kHz

|ZOUT|

ALL

0.15

0.5

Ω

∆V

REF ppm/°C

()

V

REF DEV

()/VREF TA

25°C

=

()

{} 10

6

×

∆T

A

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

=

Z

OUT, TOT =

∆V

∆I

--------Z

OUT

1

R1

R2

--------

+

×

≈

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