FOD2742CR2(2003) データシートの表示（PDF） - Fairchild Semiconductor
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FOD2742CR2 Datasheet PDF : 13 Pages
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OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2742A
FOD2742B
FOD2742C
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
1.20 1.5 V
A 2.482 2.495 2.508 V
Reference Voltage
ILED = 10 mA, VCOMP = VFB (fig. 1) VREF
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°C (fig. 1) VREF (DEV) ALL
3.5 17 mV
Ratio of VREF variation to the
output of the error amplifier
ILED = 10 mA ∆VCOMP = 10V to VREF
(fig. 2) ∆VCOMP = 36V to 10V
∆VREF/
∆VCOMP
ALL
-0.5 -2.7 mV/
-0.3 -2.0 V
Feedback Input Current
ILED = 10mA, R1 = 10KΩ (fig. 3)
IREF
ALL
2.2
4 µA
Deviation of IREF over
temperature
TA = -25°C to +85°C (fig. 3) IREF (DEV) ALL
1.0 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
0.01 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
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:
∆VREF (ppm/°C) = -{---V----R----E---F---(--D----E----V---)--/--V----R----E---∆F----(T--T--A--A-----=------2---5----°--C-----)--}-----×----1----0---6-
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:
ZOUT, TOT = ∆--∆---V-I- ≈ ZOUT × 1 + RR-----12--
© 2003 Fairchild Semiconductor Corporation
Page 3 of 13
8/27/03
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