Datasheet

©2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2711A Rev. 1.0.0 4
FOD2711A — Optically Isolated Error Amplifier
Electrical Characteristics
(T
A
= 25°C unless otherwise specified)
Input Characteristics
Output Characteristics
Transfer Characteristics
Notes:
4. 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.
5. 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 Min. Typ.* Max. Unit
V
F
LED Forward Voltage I
LED
= 10mA, V
COMP
= V
FB
(Fig. 1) 1.5 V
V
REF
Reference Voltage V
COMP
= V
FB
, I
LED
= 10mA (Fig.1)
-40°C to +85°C 1.221 1.259 V
25°C 1.228 1.240 1.252
V
REF (DEV)
Deviation of V
REF
Over
Temperature
(4)
T
A
= -40 to +85°C 4 12 mV
∆ V
REF
/
∆ V
COMP
Ratio of Vref Variation
to the Output of the Error
Amplifier
I
LED
= 10 mA, V
COMP
= V
REF
to 12V
(Fig. 2)
-1.5 -2.7 mV/V
I
REF
Feedback Input Current I
LED
= 10mA, R1 = 10k Ω (Fig. 3) 0.15 0.5 µA
I
REF (DEV)
Deviation of I
REF
Over
Temperature
(4)
T
A
= -40°C to +85°C 0.15 0.3 µA
I
LED (MIN)
Minimum Drive Current V
COMP
= V
FB
(Fig. 1) 55 80 µA
I
(OFF)
Off-State Error Amplifier
Current
V
LED
= 6V, V
FB
= 0 (Fig. 4) 0.001 0.1 µA
| Z
OUT
| Error Amplifier Output
Impedance
(5)
V
COMP
= V
FB
, I
LED
= 0.1mA to 15mA,
f<1 kHZ)
0.25 Ω
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
CEO
Collector Dark Current V
CE
= 10V (Fig. 5) 50 nA
BV
ECO
Emitter-Collector Voltage Breakdown I
E
= 100µA 7 V
BV
CEO
Collector-Emitter Voltage Breakdown I
C
= 1.0mA 70 V
Symbol
Parameter
Test Conditions Min. Typ. Max. Unit
CTR Current Transfer Ratio I
LED
= 10mA, V
COMP
= V
FB
,
V
CE
= 5V (Fig. 6)
100 200 %
V
CE (SAT)
Collector-Emitter Saturation
Voltage
I
LED
= 10mA, V
COMP
= V
FB,
I
C
= 2.5mA (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
--------+×≈