FOD2711_08 Datasheet, PDF (4/15 Pages) Fairchild Semiconductor – Optically Isolated Error Amplifier

Electrical Characteristics (T_A = 25°C unless otherwise specified)
Input Characteristics
Symbol
Parameter
V_F
V_REF
LED Forward Voltage
Reference Voltage
-40°C to +85°C
25°C
V_{REF (DEV)} Deviation of V_REF Over
Temperature⁽⁴⁾
∆V_REF /
∆V_COMP
Ratio of Vref Variation
to the Output of the Error
Amplifier
I_REF
I_{REF (DEV)}
Feedback Input Current
Deviation of I_REF Over
Temperature⁽⁴⁾
I_{LED (MIN)}
I_(OFF)
Minimum Drive Current
Off-State Error Amplifier
Current
| Z_OUT | Error Amplifier Output
Impedance⁽⁵⁾
Test Conditions
I_LED = 10mA, V_COMP = V_FB (Fig. 1)
V_COMP = V_FB, I_LED = 10mA (Fig.1)
T_A = -40 to +85°C
Min. Typ.* Max. Unit
1.5 V
1.221
1.259 V
1.228 1.240 1.252
4
12 mV
I_LED = 10 mA, V_COMP = V_REF to 12V
(Fig. 2)
-1.5 -2.7 mV/V
I_LED = 10mA, R1 = 10kΩ (Fig. 3)
T_A = -40°C to +85°C
V_COMP = V_FB (Fig. 1)
V_LED = 6V, V_FB = 0 (Fig. 4)
V_COMP = V_FB, I_LED = 0.1mA to 15mA,
f<1 kHZ)
0.15 0.5 µA
0.15 0.3 µA
55 80 µA
0.001 0.1 µA
0.25
Ω
Output Characteristics
Symbol
Parameter
I_CEO
BV_ECO
BV_CEO
Collector Dark Current
Emitter-Collector Voltage Breakdown
Collector-Emitter Voltage Breakdown
Test Conditions
V_CE = 10V (Fig. 5)
I_E = 100µA
I_C = 1.0mA
Min.
7
70
Typ.
Max.
50
Unit
nA
V
V
Transfer Characteristics
Symbol Parameter
CTR Current Transfer Ratio
V_{CE (SAT)} Collector-Emitter Saturation
Voltage
Test Conditions
I_LED = 10mA, V_COMP = V_FB,
V_CE = 5V (Fig. 6)
I_LED = 10mA, V_COMP = V_FB,
I_C = 2.5mA (Fig. 6)
Min.
100
Typ.
Max.
200
Unit
%
0.4
V
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:
∆V_REF
( ppm/°C )
=
{_{----V----R----E---F---(--D----E----V---)--/--V----R----E---F----}(_{--T----A-----=------2---5----°--C-----})_--}_-----×_{----1----0---}⁶_-
∆T_A
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:
Z_{OUT, TOT} = ^∆--_∆---V-I- ≈ Z_OUT ×
1 + ^R-----1--
R2
©2003 Fairchild Semiconductor Corporation
FOD2711 Rev. 1.0.1
4
www.fairchildsemi.com