Page 1
FOD2741A FOD2741B FOD2741C
DESCRIPTION
The FOD2741 Optically Isolated Amplifier consists of the popular KA431 precision
programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide
(GaAs) light emitting diode optically coupled to a silicon phototransistor. It comes in 3
grades of reference voltage tolerance = 2%, 1%, and 0.5%.
The Current Transfer Ratio (CTR) ranges from 100% to 200%. It also has an outstanding
temperature coefficient of 50 ppm/°C. It is primarily intended for use as the error amplifier/
reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc converters.
When using the FOD2741, power supply designers can reduce the component count and
save space in tightly packaged designs. The tight tolerance reference eliminates the need
for adjustments in many applications. The device comes in a 8-pin dip white package.
OPTICALLY ISOLATED
ERROR AMPLIFIER
8
1
8
1
8
1
FEATURES
• Optocoupler, precision reference and error amplifier in single package
• 2.5V reference
• CTR 100% to 200%
• 5,000V RMS isolation
• UL approved E90700, Volume 2
CSA approval 1296837
VDE approval 40002463
BSI approval 8702, 8703
• Low temperature coefficient 50 ppm/°C max
• FOD2741A: tolerance 0.5%
FOD2741B: tolerance 1%
FOD2741C: tolerance 2%
APPLICATIONS
• Power supplies regulation
• DC to DC converters
PIN DEFINITIONS
Pin Number Pin Name Pin function description
1 NC Not connected
2 C Phototransistor Collector
3 E Phototransistor Emitter
4 NC Not connected
5 GND Ground
6 COMP Error Amplifier Compensation. This pin is the output of the error amplifier. *
7 FB Voltage Feedback. This pin is the inverting input to the error amplifier
8 LED Anode LED. This pin is the input to the light emitting diode.
FUNCTIONAL BLOCK DIAGRAM
NC
1
C
2
E
3
NC
4 5
8
7
6
LED
FB
COMP
GND
* The compensation network must be attached between pins 6 and 7.
© 2003 Fairchild Semiconductor Corporation
Page 1 of 15
12/9/04
Page 2
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
TYPICAL APPLICATION
FAN4803
V
1
PWM
Control
FOD2741
V
O
2
3
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Value Units
Storage Temperature
Operating Temperature
Lead Solder Temperature
Input Voltage
Input DC Current
Collector-Emitter Voltage
Emitter-Collector Voltage
Collector Current
Input Power Dissipation (note 1) PD1 145 mW
Transistor Power Dissipation (note 2) PD2 85 mW
Total Power Dissipation (note 3) PD3 145 mW
Notes
1. Derate linearly from 25°C at a rate of 2.42 mW/ °C
2. Derate linearly from 25°C at a rate of 1.42 mW/ °C.
3. Derate linearly from 25°C at a rate of 2.42 mW/ °C.
4. Functional operation under these conditions is not implied. Permanent damage may occur if the device is subjected to conditions
outside these ratings.
(T
= 25°C Unless otherwise specified.)
A
T
T
T
V
V
V
STG
OPR
SOL
LED
I
LED
CEO
ECO
8
6
7
5
-55 to +125 °C
-25 to +85 °C
260 for 10 sec. °C
37 V
20 mA
30 V
7V
I
C
50 mA
R1
R2
© 2003 Fairchild Semiconductor Corporation
Page 2 of 15
12/9/04
Page 3
/ ∆
∆
∆
/ ∆
∆
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
ELECTRICAL CHARACTERISTICS
(T
= 25°C Unless otherwise specified.)
A
INPUT CHARACTERISTICS
Parameter Test Conditions Symbol Device Min. Typ. Max. Unit
(I
LED Forward Voltage
Reference Voltage
Deviation of V
REF
over
temperature
Ratio of V
variation to the
REF
output of the error amplifier
Feedback Input Current
Deviation of I
REF
over
temperature
Minimum Drive Current
Off-state error amplifier current
Error amplifier output impedance
(see note 2)
I
LED
V
= 10 mA, V
LED
= 10 mA
I
LED
= V
COMP
I
= 10 mA, V
LED
V
= 10mA, R
V
= 37V, V
LED
, I
REF
= V
COMP
T
= -25°C to +85°CV
A
COMP
V
COMP
1
= -25°C to +85°CI
T
A
V
COMP
= 1mA to 20mA,
LED
) (fig.1) V
FB
= V
COMP
= 10V to V
FB
REF
= 36V to 10V
= 10k Ω (fig 3) I
= V
(fig.1) I
FB
= 0 (fig 4.) I
FB
f ≥ 1.0 kHz
F
V
REF
REF (DEV)
V
REF
V
COMP
REF
REF (DEV)
LED (MIN)
(OFF)
|
|Z
OUT
ALL 1.5 V
A 2.482 2.495 2.508 V
B 2.470 2.495 2.520 V
C 2.450 2.500 2.550 V
ALL 4.5 17 mV
ALL
-1.0 -2.7
-0.5 -2.0
mV/
V
ALL 1.5 4 µA
ALL 0.4 1.2 µA
ALL 0.45 1.0 mA
ALL 0.05 1.0 µA
ALL 0.15 0.5 Ω
1. 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
is defined as:
A
OUT
25°C=(){}106×
| = ∆ V
COMP
I
. When the device is operating with two external resistors (see
LED
V
∆V
REF
where ∆ T
ppm/°C()
is the rated operating free-air temperature range of the device.
A
REF DEV()/VREFTA
-----------------------------------------------------------------------------------------------------=
∆T
2. The dynamic impedance is defined as |Z
Figure 2), the total dynamic impedance of the circuit is given by:
Z
OUT, TOT
∆V
=
--------Z
∆I
OUT
R1
1
--------+×≈
R2
REF
,
© 2003 Fairchild Semiconductor Corporation
Page 3 of 15
12/9/04
Page 4
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
OUTPUT CHARACTERISTICS
(T
= 25°C Unless otherwise specified.)
A
Parameter Test Conditions Symbol Min Typ Max Unit
(V
Collector dark current
Emitter-collector voltage breakdown
Collector-emitter voltage breakdown
TRANSFER CHARACTERISTICS
(T
= 10 V) (Fig. 5) I
CE
(I
= 100 µA) BV
E
(I
= 1.0mA) BV
C
= 25°C Unless otherwise specified.)
A
CEO
ECO
CEO
50 nA
7V
70 V
Parameter Test Conditions Symbol Min Typ Max Unit
(I
(I
LED
LED
Current transfer ratio
Collector-emitter
saturation voltage
ISOLATION CHARACTERISTICS
= 10 mA, V
V
CE
= 10 mA, V
I
= 2.5 mA) (Fig. 6)
C
(T
= 25°C Unless otherwise specified.)
A
= V
COMP
FB
= 5 V) (Fig. 6)
= V
COMP
FB,
,
CTR 100 200 %
V
CE
(SAT)
0.4 V
Parameter Test Conditions Symbol Min Typ Max Unit
Input-output insulation
leakage current
Withstand insulation
voltage
Resistance (input to output)
(RH = 45%, T
V
= 3000 VDC) (note. 1)
I-O
(RH <= 50%, T
V
I-O
= 25°C, t = 5s,
A
= 25°C, t = 1 min)
A
(notes. 1)
= 500 VDC (note. 1) R
I
I-O
V
ISO
I-O
5000 Vrms
12
10
1.0 µA
Ohm
SWITCHING CHARACTERISTICS (T
= 25°C Unless otherwise specified.)
A
Parameter Test Conditions Symbol Min Typ Max Unit
Bandwidth (Fig. 7) BW 50 kHZ
(I
Common mode transient
immunity at output high
Common mode transient
immunity at output low
= 0 mA, Vcm = 10 V
LED
RL = 2.2 kΩ (Fig. 8) (note. 2)
(I
= 10 mA, Vcm = 10 V
LED
RL = 2.2 kΩ (Fig. 8) (note. 2)
PP
CMH 1.0 kV/µs
PP
CML 1.0 kV/µs
Notes
1. Device is considered as a two terminal device: Pins 1,2 3 and 4 are shorted together and Pins 5,6,7 and 8 are shorted together.
2. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the common mode impulse signal, Vcm, to assure that the output will remain high. Common mode transient immunity at output low is
the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse signal,Vcm, to assure that the output will
remain low.
© 2003 Fairchild Semiconductor Corporation
Page 4 of 15
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Page 5
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
I
I
(LED)
V
82
V
F
6
7
V
REF
5
3
V
R2
(LED)
8
6R1
7
V
COMP
V
REF
5
2
3
FIG. 1. V
V
, VF, I
REF
FIG. 3. I
8
6
7
5
(min) TEST CIRCUIT
LED
I
(LED)
8
I
REF
6
7
R1
5
TEST CIRCUIT
REF
2
V
3
CE
I
CEO
FIG. 2. ∆V
2
3
V
REF/∆VCOMP
I
(OFF)
V
(LED)
FIG. 4. I
I
(LED)
V
TEST CIRCUIT
(OFF)
8
6
7
V
REF
5
8
6
7
5
TEST CIRCUIT
V
COMP
2
3
I
C
2
V
CE
3
FIG. 5. I
TEST CIRCUIT FIG. 6. CTR, V
CEO
© 2003 Fairchild Semiconductor Corporation
Page 5 of 15
TEST CIRCUIT
CE(sat)
12/9/04
Page 6
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
VCC = +5V DC
= 10 mA
I
F
R
L
V
OUT
1
2
3
4
8
7
0.1 V
PP
6
5
1µf
47Ω
V
IN
0.47V
Fig. 7 Frequency Response Test Circuit
= +5V DC
V
CC
I
= 0 mA (A)
F
IF = 10 mA (B)
R1
2.2kΩ
1
8
V
OUT
© 2003 Fairchild Semiconductor Corporation
2
3
4
VCM
_
10V
+
P-P
7
6
5
Fig. 8 CMH and CML Test Circuit
Page 6 of 15
A
B
12/9/04
Page 7
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
TYPICAL PERFORMANCE CURVES
15
TA = 25°C
= V
V
COMP
10
5
0
-5
- Supple Current (mA)
LED
I
-10
-15
-1 0 1 2
FB
- Cathode Voltage (V)
V
COMP
Fig. 10 – Reference Voltage vs. Ambient Temperature
2.510
I
= 10mA
LED
2.508
2.506
2.504
2.502
2.500
2.498
2.496
- Reference Voltage (V)
REF
2.494
V
2.492
2.490
Fig. 9a – LED Current vs. Cathode Voltage
-40 -20 0 20 40 60 80 100
TA - Ambient Temperature (°C)
1.0
0.5
0.0
- Supple Current (mA)
LED
-0.5
I
3
-1.0
Fig. 9b – LED Current vs. Cathode Voltage
= 25°C
T
A
= V
V
COMP
FB
-1 0 1 2
V
- Cathode Voltage (V)
COMP
3
Fig. 11 – Reference Current vs Ambient Temperature
1.30
I
= 10mA
LED
R1 = 10kΩ
1.25
1.20
1.15
- Reference Current (µA)
REF
I
1.10
1.05
-40 -20 0 20 40 60 80 100
T
- Ambient Temperature (°C)
A
Fig. 12 – Off-State Current vs. Ambient Temperature
100
VCC = 37V
10
- Off-State Current (nA)
OFF
I
1
-40 -20 0 20 40 60 80 100
TA - Ambient Temperature (°C)
© 2003 Fairchild Semiconductor Corporation
Page 7 of 15
Fig. 13 – Forward Current vs. Forward Voltage
20
15
10
- Forward Current (mA)
F
I
5
0.9 1.0 1.1 1.2
70°C
VF - Forward Voltage (V)
25°C
0°C
1.3 1.4
12/9/04
Page 8
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
Fig. 14 – Dark Current vs. Ambient Temperature
10000
VCE = 10V
1000
100
10
- Dark Current (nA)
CEO
I
1
0.1
-40 -20 0 20 40 60 80 100
T
- Ambient Temperature (°C)
A
Fig. 16 – Current Transfer Ratio vs. LED Current
VCE = 5V
140
120
100
80
60
(IC/IF) - Current Transfer Ratio (%)
40
0105 1520253035404550
I
LED
0°C
25°C
70°C
- Forward Current (mA)
Fig. 15 – Collector Current vs. Ambient Temperature
30
VCE = 5V
25
I
= 20mA
20
15
10
IC - Collector Current (mA)
5
0
0 102030405060708090100
LED
I
= 10mA
LED
I
= 6mA
LED
I
= 1mA
LED
TA - Ambient Temperature (°C)
Fig. 17 – Saturation Voltage vs. Ambient Temperature
0.26
0.24
0.22
0.20
0.18
0.16
- Saturation Voltage (V)
0.14
CE(sat)
V
0.12
0.10
-40 -20 0 20 40
- Ambient Temperature (°C)
T
A
60 80 100
Fig. 18 – Collector Current vs. Collector Voltage
35
TA = 25°C
30
25
20
15
10
- Collector Current (mA)
C
I
5
0
012345678910
VCE - Collector-Emitter Voltage (V)
© 2003 Fairchild Semiconductor Corporation
I
LED
I
LED
= 20mA
I
LED
I
LED
= 10mA
= 5mA
= 1mA
Page 8 of 15
Fig. 19 – Rate of Change Vref to Vout vs. Temperature
-0.32
-0.34
-0.36
-0.38
-0.40
-0.42
Delta Vref / Delta Vout ( mV/V)
-0.44
-0.46
-60 -40 -20 0 20 40 60 80 100
Temperature - °C
120
12/9/04
Page 9
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
Fig. 20 – Voltage Gain vs. Frequency
VCC=10V
IF=10mA
0
RL = 100Ω
-5
Voltage Gain - dB
-10
-15
0.1 1 10 100 1000
RL = 500Ω
RL = 1kΩ
Frequency - kHz
© 2003 Fairchild Semiconductor Corporation
Page 9 of 15
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Page 10
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
The FOD2741
The FOD2741 is an optically isolated error amplifier. It incorporates three of the most common elements necessary to
make an isolated power supply, a reference voltage, an error
amplifier, and an optocoupler. It is functionally equivalent to
the popular KA431 shunt voltage regulator plus the CNY17F-X
optocoupler.
Powering the Secondary Side
The LED pin in the FOD2741 powers the secondary side, and
in particular provides the current to run the LED. The actual
structure of the FOD2741 dictates the minimum voltage that
can be applied to the LED pin: The error amplifier output has a
minimum of the reference voltage, and the LED is in series
with that. Minimum voltage applied to the LED pin is thus 2.5V
+ 1.5V = 4.0V. This voltage can be generated either directly
from the output of the converter, or else from a slaved secondary winding. The secondary winding will not affect regulation,
as the input to the FB pin may still be taken from the output
winding.
The LED pin needs to be fed through a current limiting resistor.
The value of the resistor sets the amount of current through
the LED, and thus must be carefully selected in conjunction
with the selection of the primary side resistor.
Feedback
Output voltage of a converter is determined by selecting a
resistor divider from the regulated output to the FB pin. The
FOD2741 attempts to regulate its FB pin to the reference
voltage, 2.5V. The ratio of the two resistors should thus be:
R
TOP
-------------------------R
BOTTOM
The absolute value of the top resistor is set by the input offset
current of 5.2µA. To achieve 0.5% accuracy, the resistance of
R
should be:
TOP
V
OUT
----------------------------R
TOP
V
OUT
-------------- 1–=
V
REF
2.5–
1040µA>
Compensation
The compensation pin of the FOD2741 provides the opportunity for the designer to design the frequency response of the
converter. A compensation network may be placed between
the COMP pin and the FB pin. In typical low-bandwidth
systems, a 0.1µF capacitor may be used. For converters with
more stringent requirements, a network should be designed
based on measurements of the system’s loop. An excellent
reference for this process may be found in “Practical Design of
Power Supplies” by Ron Lenk, IEEE Press, 1998.
Secondary Ground
The GND pin should be connected to the secondary ground of
the converter.
No Connect Pins
The NC pins have no internal connection. They should not
have any connection to the secondary side, as this may
compromise the isolation structure.
Photo-Transistor
The Photo-transistor is the output of the FOD2741. In a normal
configuration the collector will be attached to a pull-up resistor
and the emitter grounded. There is no base connection necessary.
The value of the pull-up resistor, and the current limiting resistor feeding the LED, must be carefully selected to account for
voltage range accepted by the PWM IC, and for the variation in
current transfer ratio (CTR) of the opto-isolator itself.
Example: The voltage feeding the LED pins is +12V, the voltage feeding the collector pull-up is +10V, and the PWM IC is
the Fairchild KA1H0680, which has a 5V reference. If we
select a 10kΩ resistor for the LED, the maximum current the
LED can see is (12V-4V) /10kΩ = 800µA. The CTR of the
opto-isolator is a minimum of 100%, so the minimum collector
current of the photo-transistor when the diode is full on is also
800µA. The collector resistor must thus be such that:
10V 5V–
------------------------------------800µA or R
R
COLLECTOR
COLLECTOR
6.25kΩ;><
© 2003 Fairchild Semiconductor Corporation
select 12kΩ to allow some margin.
Page 10 of 15
12/9/04
Page 11
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
Package Dimensions (Through Hole)
PIN 1
ID.
241
0.270 (6.86)
0.250 (6.35)
8
0.070 (1.78)
0.045 (1.14)
0.020 (0.51) MIN
0.154 (3.90)
0.120 (3.05)
0.016 (0.40)
0.008 (0.20)
15° MAX
0.300 (7.62)
TYP
0.200 (5.08)
0.140 (3.55)
SEATING PLANE
0.022 (0.56)
0.016 (0.41)
3
56 7
0.390 (9.91)
0.370 (9.40)
0.100 (2.54) TYP
Package Dimensions (0.4"Lead Spacing)
Package Dimensions (Surface Mount)
0.390 (9.91)
0.370 (9.40)
3214
567
0.100 (2.54)
Lead Coplanarity : 0.004 (0.10) MAX
TYP
0.270 (6.86)
0.250 (6.35)
8
0.070 (1.78)
0.045 (1.14)
0.022 (0.56)
0.016 (0.41)
PIN 1
ID.
0.020 (0.51)
MIN
0.300 (7.62)
TYP
0.045 [1.14]
0.315 (8.00)
MIN
0.405 (10.30)
MIN
0.016 (0.41)
0.008 (0.20)
8 - Pin Dip
PIN 1
0.270 (6.86)
0.250 (6.35)
8
0.070 (1.78)
0.045 (1.14)
0.154 (3.90)
0.120 (3.05)
ID.
0.004 (0.10) MIN
0.016 (0.40)
0.008 (0.20)
0.200 (5.08)
0.140 (3.55)
SEATING PLANE
0.022 (0.56)
0.016 (0.41)
3
241
56 7
0.390 (9.91)
0.370 (9.40)
0.100 (2.54) TYP
NOTE
All dimensions are in inches (millimeters)
0° to 15°
0.400 (10.16)
TYP
0.415 (10.54)
0.070 (1.78)
0.060 (1.52)
0.100 (2.54)
0.295 (7.49)
0.030 (0.76)
© 2003 Fairchild Semiconductor Corporation
Page 11 of 15
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Page 12
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
ORDERING INFORMATION
Example: FOD2741A X Y
X
Packaging Option
T: 0.4” Lead Spacing
S: Surface Mount Lead Bend
SD: Surface Mount Tape and Reel (1000 per reel)
MARKING INFORMATION
Definitions
Y
V: VDE tested
XXV
43
2741A
BYY
5
1
2
6
1 Fairchild logo
2 Device number
VDE mark (Note: Only appears on parts ordered with VDE
3
option – See order entry table)
4 Two digit year code, e.g., ‘03’
5 Two digit work week ranging from ‘01’ to ‘53’
6 Assembly package code
© 2003 Fairchild Semiconductor Corporation
Page 12 of 15
12/9/04
Page 13
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
Carrier Tape Specifications
D
P
K
t
0
0
P
2
0
E
F
W
D
1
W
1
d
User Direction of Feed
A
0
B
0
P
Description Symbol Dimension in mm
Tape Width W 16.0 ± 0.3
Tape Thickness t 0.30 ± 0.05
Sprocket Hole Pitch P
Sprocket Hole Diameter D
0
0
4.0 ± 0.1
1.55 ± 0.05
Sprocket Hole Location E 1.75 ± 0.10
Pocket Location
F 7.5 ± 0.1
P
2
4.0 ± 0.1
Pocket Pitch P 12.0 ± 0.1
Pocket Dimensions
Cover Tape Width W
A
0
B
0
K
0
1
10.30 ±0.20
10.30 ±0.20
4.90 ±0.20
1.6 ± 0.1
Cover Tape Thickness d 0.1 max
Max. Component Rotation or Tilt 10°
Min. Bending Radius R 30
© 2003 Fairchild Semiconductor Corporation
Page 13 of 15
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OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
Reflow Profile
300
C peak
250
200
150
100
50
Temperature (°C)
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5
0
• Peak reflow temperature: 260 C (package surface temperature)
• Time of temperature higher than 183 C for 160 seconds or less
• One time soldering reflow is recommended
260
Time above 183 C, <160 sec
Ramp up = 2–10
Time (Minute)
245 C, 10–30 s
C/sec
© 2003 Fairchild Semiconductor Corporation
Page 14 of 15
12/9/04
Page 15
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2741A FOD2741B FOD2741C
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in a significant injury of the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
© 2003 Fairchild Semiconductor Corporation
Page 15 of 15
12/9/04
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Datasheets for electronics components.
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