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FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
August 2008
FOD2741A, FOD2741B, FOD2741C
Optically Isolated Error Amplifier
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 50ppm/°C max.
■FOD2741A: tolerance 0.5%
FOD2741B: tolerance 1%
FOD2741C: tolerance 2%
Applications
■Power supplies regulation
■DC to DC converters
Description
The FOD2741 Optically Isolated Amplifier consists of the
popular KA431 precision programmable shunt reference
and an optocoupler. The optocoupler is a gallium ars-
enide (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 iso-
lated 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 elimi-
nates the need for adjustments in many applications.
The device comes in a 8-pin dip white package.
Functional Bock Diagram Package Outlines
8
8
1
8
1
1
1
2
3
4 5
6
7
8LED
FB
COMP
GND
NC
C
E
NC
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 2
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Pin Definitions
*The compensation network must be attached between pins 6 and 7.
Typical Application
Pin Number Pin Name Pin Description
1NCNot connected
2CPhototransistor Collector
3EPhototransistor Emitter
4NCNot connected
5 GND Ground
6 COMP Error Amplifier Compensation. This pin is the output of the error amplifier.*
7FBVoltage 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.
VO
V1
R1
R2
2
3
8
6
7
5
PWM
Control
FAN4803
FOD2741
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 3
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Absolute Maximum Ratings
(T
A
= 25°C unless otherwise specified)
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Notes:
1. Derate linearly from 25°C at a rate of 2.42mW/°C
2. Derate linearly from 25°C at a rate of 1.42mW/°C.
3. Derate linearly from 25°C at a rate of 2.42mW/°C.
Symbol Parameter Value Units
T
STG
Storage Temperature -40 to +125 °C
T
OPR
Operating Temperature -40 to +85 °C
T
SOL
Lead Solder Temperature 260 for 10 sec. °C
V
LED
Input Voltage 37 V
I
LED
Input DC Current 20 mA
V
CEO
Collector-Emitter Voltage 30 V
V
ECO
Emitter-Collector Voltage 7 V
I
C
Collector Current 50 mA
PD1 Input Power Dissipation
(1)
145 mW
PD2 Transistor Power Dissipation
(2)
85 mW
PD3 Total Power Dissipation
(3)
145 mW
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 4
FOD2741A, FOD2741B, FOD2741C — 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 Device Min. Typ. Max. Unit
V
F
LED Forward Voltage I
LED
= 10mA, V
COMP
= V
FB
(Fig.1) All 1.5 V
V
REF
Reference Voltage I
LED
= 10mA, V
COMP
= V
FB
FOD2741A 2.482 2.495 2.508 V
FOD2741B 2.470 2.495 2.520 V
FOD2741C 2.450 2.500 2.550 V
V
REF (DEV)(4)
Deviation of V
REF
Over
Temperature
T
A
= -25°C to +85°C All 4.5 17 mV
∆
V
REF
/
∆
V
COMP
Ratio of V
REF
Variation
to the Output of the
Error Amplifier
I
LED
= 10mA
∆
V
COMP
= 10V to V
REF
All -1.0 -2.7 mV/V
∆
V
COMP
= 36V to 10V -0.5 -2.0
I
REF
Feedback Input
Current
I
LED
= 10mA, R
1
= 10k
Ω
(Fig. 3) All 1.5 4 µA
I
REF (DEV)(4)
Deviation of I
REF
Over
Temperature
T
A
= -25°C to +85°C All 0.4 1.2 µA
I
LED (MIN)
Minimum Drive Current V
COMP
= V
FB
(Fig. 1) All 0.45 1.0 mA
I
(OFF)
Off-state Error
Amplifier Current
V
LED
= 37V, V
FB
= 0 (Fig. 4) All 0.05 1.0 µA
|Z
OUT
| Error Amplifier Output
impedance
(5)
V
COMP
= V
REF
, I
LED
= 1mA to 20mA,
f
≥
1.0 kHz
All 0.15 0.5
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
∆VREF ppm/°C()
VREF DEV()
/VREF TA25°C=(){}106
×
∆TA
-----------------------------------------------------------------------------------------------------=
ZOUT, TOT =∆V
∆I
--------Z
OUT 1R1
R2
--------+×≈
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 5
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Electrical Characteristics
(Continued) (T
A
= 25°C unless otherwise specified)
Isolation Characteristics
Switching Characteristics
Notes:
6. 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.
7. 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.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
I-O
Input-Output Insulation
Leakage Current
RH = 45%, T
A
= 25°C, t = 5s,
VI-O = 3000 VDC(6)
1.0 µA
VISO Withstand Insulation
Voltage
RH ≤ 50%, TA = 25°C, t = 1 min.(6) 5000 Vrms
RI-O Resistance (Input to Output) VI-O = 500 VDC(6) 1012 Ω
Symbol Parameter Test Conditions Min. Typ. Max. Unit
BW Bandwidth (Fig. 7) 50 kHZ
CMHCommon Mode Transient
Immunity at Output HIGH
ILED = 0mA, Vcm = 10 VPP,
RL = 2.2kΩ(7) (Fig. 8)
1.0 kV/µs
CMLCommon Mode Transient
Immunity at Output LOW
(ILED = 1mA, Vcm = 10 VPP,
RL = 2.2kΩ(7) (Fig. 8)
1.0 kV/µs
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 6
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Test Circuits
I(LED)
V(LED)
VCOMP
VCOMP
ICEO
VCE
VREF
VCE
I(LED)
VF
VREF VREF
82
3
2
3
VV
V
6
7
5
I(LED)
I(LED) IC
I(OFF)
IREF
8
6
2
3
2
3
2
3
V
V
7
5
8
6
7
5
8
6
7
5
8
6
2
3
7
5
R1
8
6R1
R2
7
5
Figure 1. VREF, VF, ILED (min.) Test Circuit
Figure 3. IREF Test Circuit
Figure 5. ICEO Test Circuit Figure 6. CTR, VCE(sat) Test Circuit
Figure 4. I(OFF) Test Circuit
Figure 2. ∆VREF / ∆VCOMP Test Circuit
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 7
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Test Circuits (Continued)
6
7
8
5
1
4
2
AB
3
6
5
7
8
2
3
4
1
VCC = +5V DC
VCC = +5V DC
IF = 1mA
IF = 0mA (A)
IF = 1mA (B)
VIN
0.47V
0.1 VPP
47Ω
VOUT
VOUT
VCM
10VP-P
R1
2.2kΩ
RL
1µF
+
_
Figure 7. Frequency Response Test Circuit.
Figure 8. CMH and CML Test Circuit
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 8
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Typical Performance Curves
Fig. 10 – Reference Voltage vs. Ambient Temperature
VREF – REFERENCE VOLTAGE (V)
ILED = 10mA
TA – AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
TA – AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
IREF – REFERENCE CURRENT (µA)
Fig. 11 – Reference Current vs Ambient Temperature
2.490
2.492
2.494
2.496
2.498
2.500
2.502
2.504
2.506
2.508
2.510
1.05
1.10
1.15
1.20
1.25
1.30
ILED = 10mA
R1 = 10kΩ
TA = 25°C
VCOMP = VFB
Fig. 9a – LED Current vs. Cathode Voltage
ILED – SUPPLY CURRENT (mA)
ILED – SUPPLY CURRENT (mA)
-15
-10
-5
0
5
10
15
-1 0 1 2
VCOMP – CATHODE VOLTAGE (V)
3
Fig. 9b – LED Current vs. Cathode Voltage
-1.0
-0.5
0.0
0.5
1.0
–1 0 1 2
VCOMP – CATHODE VOLTAGE (V)
3
TA = 25°C
VCOMP = VFB
TA – AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
IOFF – OFF–STATE CURRENT (nA)
1
10
100
Fig. 12 – Off–State Current vs. Ambient Temperature
VCC = 37V
VF – FORWARD VOLTAGE (V)
IF – FORWARD CURRENT (mA)
5
0.9 1.0 1.1 1.2
70°C
25°C
0°C
1.3 1.4
10
15
20
Fig. 13 – Forward Current vs. Forward Voltage
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 9
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
TA – AMBIENT TEMPERATURE (°C)
ILED – FORWARD CURRENT (mA)
01051520253035404550
(IC/IF) – CURRENT TRANSFER RATIO (%)
40
60
80
100
120
140
0102030405060708090100
IC – COLLECTOR CURRENT (mA)
0
5
10
15
20
25
30
Fig. 15 – Collector Current vs. Ambient Temperature
Fig. 16 – Current Transfer Ratio vs. LED Current
VCE = 5V
0°C
25°C
70°C
ILED = 20mA
VCE = 5V
ILED = 10mA
ILED = 6mA
ILED = 1mA
Fig. 17 – Saturation Voltage vs. Ambient Temperature
VCE(sat) – SATURATION VOLTAGE (V)
0.10
0.12
0.14
0.16
0.18
0.20
0.22
-40 -20 0 20 40
TA – AMBIENT TEMPERATURE (°C)
60 80 100
0.24
0.26
TA – AMBIENT TEMPERATURE (°C)
VCE – COLLECTOR-EMITTER VOLTAGE (V)
-40 -20 0 20 40 60 80 100
ICEO – DARK CURRENT (nA)
0.1
1
10
100
1000
10000
012345678910
IC – COLLECTOR CURRENT (mA)
0
5
10
15
20
25
30
35
Fig. 14 – Dark Current vs. Ambient Temperature
Fig. 18 – Collector Current vs. Collector Voltage
VCE = 10V
TA = 25°C
ILED = 20mA
ILED = 10mA
ILED = 5mA
ILED = 1mA
TEMPERATURE (°C)
DELTA Vref / DELTA Vout ( mV/V)
-0.32
-0.34
-0.36
-0.38
-0.40
-0.42
-0.44
-0.46
-60 -40 -20 0 20 40 60 80 100 120
Fig. 19 – Rate of Change Vref to Vout vs. Temperature
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 10
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
0.1 1 10 100 1000
Fig. 20 – Voltage Gain vs. Frequency
FREQUENCY (kHz)
VOLTAGE GAIN (dB)
-15
-10
-5
0
VCC=10V
IF=10mA
RL = 100Ω
RL = 1kΩ
RL = 500Ω
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 11
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
The FOD2741
The FOD2741 is an optically isolated error amplifier. It
incorporates three of the most common elements neces-
sary to make an isolated power supply, a reference volt-
age, an error amplifier, and an optocoupler. It is
functionally equivalent to the popular KA431 shunt volt-
age 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 volt-
age 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 regula-
tion, 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 ref-
erence
voltage, 2.5V. The ratio of the two resistors should thus
be:
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 RTOP should be:
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 typ-
ical 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 pro-
cess may be found in “Practical Design of Power Sup-
plies” 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 ref-
erence. 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:
select 12kΩ to allow some margin.
RTOP
RBOTTOM
--------------------------VOUT
VREF
-------------- 1–=
VOUT 2.5–
RTOP
-----------------------------1040µA>
10V 5V–
RCOLLECTOR
----------------------------------- 8 0 0 µA or RCOLLECTOR 6.25kΩ;><
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 12
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Ordering Information
Marking Information
Option Example Part Number Description
No Option FOD2741A Standard Through Hole
S FOD2741AS Surface Mount Lead Bend
SD FOD2741ASD Surface Mount; Tape and Reel
T FOD2741AT 0.4" Lead Spacing
V FOD2741AV VDE0884
TV FOD2741ATV VDE0884; 0.4” Lead Spacing
SV FOD2741ASV VDE0884; Surface Mount
SDV FOD2741ASDV VDE0884; Surface Mount; Tape and Reel
1
2
6
43 5
Definitions
1Fairchild logo
2Device number
3VDE mark (Note: Only appears on parts ordered with VDE
option – See order entry table)
4Two digit year code, e.g., ‘03’
5Two digit work week ranging from ‘01’ to ‘53’
6Assembly package code
2741A
BYY
XXV
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 13
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Carrier Tape Specifications
Reflow Profile
Symbol Description Dimension in mm
WTape Width 16.0 ± 0.3
tTape Thickness 0.30 ± 0.05
P0Sprocket Hole Pitch 4.0 ± 0.1
D0Sprocket Hole Diameter 1.55 ± 0.05
E Sprocket Hole Location 1.75 ± 0.10
FPocket Location 7.5 ± 0.1
P24.0 ± 0.1
PPocket Pitch 12.0 ± 0.1
A0Pocket Dimensions 10.30 ±0.20
B010.30 ±0.20
K04.90 ±0.20
W1Cover Tape Width 1.6 ± 0.1
dCover Tape Thickness 0.1 max
Max. Component Rotation or Tilt 10°
R Min. Bending Radius 30
d
0
P
t2
D0
1
1
W
User Direction of Feed
0
K
B0
A0W
E
D
F
P
P
• 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
245 C, 10–30 s
Time (Minute)
0
300
250
200
150
100
50
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5
Temperature (°C)
Time above 183 C, <160 sec
Ramp up = 2–10 C/sec
260 C peak
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arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
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