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FOD2711 Datasheet, PDF (3/15 Pages) Fairchild Semiconductor – optically isolated error amplifier | |||
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OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2711
ELECTRICAL CHARACTERISTICS (TA = 25°C Unless otherwise speciï¬ed.)
INPUT CHARACTERISTICS
Parameter
Test Conditions Symbol Min Typ** Max Unit
LED forward voltage
Reference voltage
(ILED = 10 mA, VCOMP = VFB)(Fig.1)
VF
1.5 V
(-40 to +85°C)
(25°C)
(VCOMP = VFB, ILED = 10 mA (Fig.1)
VREF
1.221
1.259
V
1.228 1.240 1.252
Deviation of VREF over temperature - See Note 1
(TA = -40 to +85°C)
Ratio of Vref variation
to the output of the error ampliï¬er
(ILED = 10 mA,
VCOMP = VREF to 12 V) (Fig.2)
Feedback input current
(ILED = 10 mA, R1 = 10 kâ¦) (Fig.3)
Deviation of IREF over temperature - See Note 1
(TA = -40 to +85°C)
Minimum drive current
(VCOMP = VFB) (Fig.1)
Off-state error ampliï¬er current
(VLED = 6 V, VFB = 0) (Fig.4)
Error ampliï¬er
output impedance - See Note 2
(VCOMP = VFB, ILED = 0.1 mA to 15 mA,
f<1 kHZ)
VREF (DEV)
âVREF/
âVCOMP
IREF
IREF (DEV)
ILED (MIN)
I(OFF)
|ZOUT|
4
12 mV
-1.5 -2.7 mV/V
0.15 0.5 µA
0.15 0.3 µA
55 80 µA
0.001 0.1 µA
0.25
Ohm
1. The deviation parameters VREF(DEV) and IREF(DEV) are deï¬ned as the differences between the maximum and minimum values
obtained over the rated temperature range. The average full-range temperature coefï¬cient of the reference input voltage, âVREF,
is deï¬ned as:
âVREF (ppm/°C) = -{---V----R----E---F---(--D----E----V---)--/--V----R----E---âF----(T--T--A--A-----=------2---5----°--C-----)--}-----Ã----1----0---6-
where âTA is the rated operating free-air temperature range of the device.
2. The dynamic impedance is deï¬ned as |ZOUT| = âVCOMP/âILED. When the device is operating with two external resistors (see
Figure 2), the total dynamic impedance of the circuit is given by:
ZOUT, TOT = â--â---V-I- â ZOUT Ã 1 + RR-----12--
© 2003 Fairchild Semiconductor Corporation
Page 3 of 15
4/14/03
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