FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1
April 2009
FOD2742A, FOD2742B, FOD2742C
Optically Isolated Error Amplifier
Features
■
Optocoupler, precision reference and error amplifier in
single package
■
2.5V reference
■
CTR 100% to 200%
■
2,500V RMS isolation
■
UL approval E90700, Volume 2
■
BSI approval 8661, 8662
■
VDE approval 136616
■
CSA approval 1113643
■
Low temperature coefficient 50 ppm/°C max.
■
FOD2742A: tolerance 0.5%
FOD2742B: tolerance 1%
FOD2742C: tolerance 2%
Applications
■
Power supplies regulation
■
DC to DC converters
Description
The FOD2742 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 FOD2742, 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 small outline
package.
Schematic Package Outline
1
2
3
4 5
6
7
8LED
FB
COMP
GND
NC
C
E
NC
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 2
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Pin Definitions
*The compensation network must be attached between pins 6 and 7.
Typical Application
Pin Number Pin Name Functional 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
FOD2742
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 3
FOD2742A, FOD2742B, FOD2742C — 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 -25 to +85 °C
Reflow Temperature Profile (refer to 15)
V
LED
Input Voltage 37 V
I
LED
Input DC Current 20 mA
V
CEO
Collector-Emitter Voltage 70 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
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 4
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Electrical Characteristics
(T
A
= 25°C unless otherwise specified)
Input Characteristics
Notes:
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
REF
, is defined as:
where
∆
T
A
is the rated operating free-air temperature range of the device.
2. 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 1.20 1.5 V
V
REF
Reference Voltage I
LED
= 10mA, V
COMP
= V
FB
(Fig. 1) A 2.482 2.495 2.508 V
B 2.470 2.495 2.520 V
C 2.450 2.500 2.550 V
V
REF (DEV)
Deviation of V
REF
Over
Temperature
T
A
= -25°C to +85°C (Fig. 1) All 3.5 17 mV
∆
V
RE
∆
V
COMP
Ratio of V
REF
Variation to
the Output of the Error
Amplifier
I
LED
= 10mA
(Fig. 2)
∆
V
COMP
= 10V to V
REF
All -0.5 -2.7 mV/
V
∆
V
COMP
= 36V to 10V -0.3 -2.0
I
REF
Feedback Input Current I
LED
= 10mA, R
1
= 10K
Ω
(Fig. 3) All 2.2 4 µA
I
REF (DEV)
Deviation of I
REF
Over
Temperature
T
A
= -25°C to +85°C (Fig. 3) All 1.0 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 0.01 1.0 µA
|Z
OUT
| Error Amplifier Output
Impedance (see note 2)
V
COMP
= V
REF
, I
LED
= 1mA to 20mA,
f
≥
1.0kHz
All 0.15 0.5
Ω
∆VREF ppm/°C()
VREF DEV()
/VREF TA25°C=(){}106
×
∆TA
-----------------------------------------------------------------------------------------------------=
ZOUT, TOT =∆V
∆I
--------Z
OUT 1R1
R2
--------+×≈
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 5
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Electrical Characteristics
(T
A
= 25°C unless otherwise specified) (Continued)
Output Characteristics
Transfer Characteristics
Isolation Characteristics
Switching Characteristics
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.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
CEO
Collector Dark Current V
CE
= 10V (Fig. 5) 1 50 nA
BV
ECO
Emitter-Collector Voltage
Breakdown
I
E
= 100µA 7 10 V
BV
CEO
Collector-Emitter Voltage
Breakdown
I
C
= 1.0mA 70 120 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)
100 140 200 %
V
CE
(SAT)
Collector-Emitter
Saturation Voltage
I
LED
= 10mA, V
COMP
= V
FB
,
I
C
= 2.5mA (Fig. 6)
0.16 0.4 V
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 (Note 1)
1.0 µA
VISO Withstand Insulation Voltage RH ≤ 50%, TA = 25°C,
t = 1 min. (Note 1)
2500 Vrms
RI-O Resistance (Input to Output) VI-O = 500 VDC (Note 1) 1012 Ω
Symbol Parameter Test Conditions Min. Typ. Max. Unit
BWBandwidth Fig. 7 50 kHz
CMHCommon Mode Transient
Immunity at Output HIGH
ILED = 0mA, Vcm = 10 VPP
RL = 2.2kΩ (Fig. 8) (Note 2)
1.0 kV/µs
CMLCommon Mode Transient
Immunity at Output LOW
ILED = 10mA, Vcm = 10 VPP
RL = 2.2kΩ (Fig. 8) (Note 2)
1.0 kV/µs
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 6
FOD2742A, FOD2742B, FOD2742C — 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) I(C)
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
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 7
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Test Circuits (Continued)
3
2
1
4
8
7
6
AB
5
3
4
2
1
6
5
7
8
VCC = +5V DC
VCC = +5V DC
IF = 10 mA
IF = 0 mA (A)
IF = 10 mA (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
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 8
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Typical Performance Curves
Fig. 10 Reference Voltage vs. Ambient Temperature
IOFF – OFF-STATE CURRENT (nA)
VLED = 37V
TA = 25°C
VCOMP = VFB
TA – AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
TA – AMBIENT TEMPERATURE(°C)
-40 -20 0 20 40 60 80 100
Fig. 9a LED Current vs. Cathode Voltage
ILED – SUPPLY CURRENT (mA)
ILED – SUPPLY CURRENT (mA)
IREF – REFERENCE CURRENT (µA)
-15
-10
-5
0
5
10
15
-1 0 1 2
VCOMP – CATHODE VOLTAGE (V)
3
Fig. 9b LED Current vs. Cathode Voltage
Fig. 11 Reference Current vs Ambient Temperature
-1.0
-0.5
0.0
0.5
1.0
-1 0 1 2
VCOMP – CATHODE VOLTAGE (V)
3
1
10
100
2
3
TA = 25°C
VCOMP = VFB
ILED = 10mA
R1 = 10kΩ
Fig. 12 Off-State Current vs. Ambient Temperature
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
VREF – REFERENCE VOLTAGE (V)
ILED = 10mA
TA – AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
2.490
2.492
2.494
2.496
2.498
2.500
2.502
2.504
2.506
2.508
2.510
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 9
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
TA – AMBIENT TEMPERATURE (°C)
TA – AMBIENT TEMPERATURE (°C)
VCE – COLLECTOR-EMITTER VOLTAGE (V)
ILED – FORWARD CURRENT (mA)
110100
(IC/IF) – CURRENT TRANSFER RATIO (%)
40
60
80
100
120
140
160
0102030405060708090100
IC – COLLECTOR CURRENT (mA)
0
5
10
15
20
25
30
-40 -20 0 20 40 60 80 100
ICEO – DARK CURRENT (nA)
0.1
1
10
100
1000
012345678910
IC – COLLECTOR CURRENT (mA)
0
5
10
15
20
25
30
35
Fig. 15 Collector Current vs. Ambient Temperature
Fig. 14 Dark Current vs. Ambient Temperature
Fig. 18 Collector Current vs. Collector Voltage
Fig. 16 Current Transfer Ratio vs. LED Current
VCE = 5V ILED = 10mA
IC = 2.5mA
0°C
25°C
70°C
ILED = 20mA
VCE = 5V
ILED = 10mA
ILED = 5mA
ILED = 1mA
VCE = 10V
TA = 25°C
ILED = 20mA
ILED = 10mA
ILED = 5mA
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
TEMPERATURE (°C)
∆Vref /∆Vout ( mV/V)
-0.32
-0.30
-0.28
-0.26
-0.24
-0.22
-0.34
-0.36
-0.38
-0.40
-0.42
-0.44
-40 -20 0 20 40 60 80 100
Fig. 19 Rate of Change Vref to Vout vs. Temperature
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 10
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
110100 1000
Fig. 20 Voltage Gain vs. Frequency
FREQUENCY (kHz)
VOLTAGE GAIN (dB)
-15
-10
-5
0
5VCC = 10V
IF = 10mA
RL = 100Ω
RL = 1kΩ
RL = 500Ω
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 11
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
The FOD2742
The FOD2742 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 FOD2742 powers the secondary
side, and in particular provides the current to run the
LED. The actual structure of the FOD2742 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 cur-
rent 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 FOD2742 attempts to regulate its FB pin to the
reference 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 FOD2742 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 FOD2742. 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 10KV 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;><
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 12
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Package Dimensions
8-pin SOIC Surface Mount
Recommended Pad Layout
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
Lead Coplanarity: 0.004 (0.10) MAX
0.202 (5.13)
0.182 (4.63)
0.021 (0.53)
0.011 (0.28)
0.050 (1.27) Typ.
0.164 (4.16)
1
8
0.144 (3.66)
0.244 (6.19)
0.224 (5.69)
0.143 (3.63)
0.123 (3.13)
0.008 (0.20)
0.003 (0.08)
0.010 (0.25)
0.006 (0.16)
SEATING PLANE
0.024 (0.61)
0.050 (1.27)
Dimensions in inches (mm).
0.155 (3.94)
0.275 (6.99)
0.060 (1.52)
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 13
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Ordering Information
Marking Information
Option Order Entry Identifier Description
VVVDE 0884
R2 R2 Tape and reel (2500 units per reel)
R2V R2V VDE 0884, Tape and reel (2500 units per reel)
1
2
6
43 5
Definitions
1Fairchild logo
2Device number
3 VDE mark (Note: Only appears on parts ordered with VDE
option – See order entry table)
4 One digit year code, e.g., ‘3’
5Two digit work week ranging from ‘01’ to ‘53’
6 Assembly package code
2742A
SYYXV
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 14
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Carrier Tape Specifications
4.0 ± 0.10
Ø1.5 MIN
User Direction of Feed
2.0 ± 0.05
1.75 ± 0.10
5.5 ± 0.05
12.0 ± 0.3
8.0 ± 0.10
0.30 MAX
8.3 ± 0.10
3.50 ± 0.20
Dimensions in mm
0.1 MAX 6.40 ± 0.20
5.20 ± 0.20
Ø1.5 ± 0.1
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 15
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
Reflow Profile
Profile Freature Pb-Free Assembly Profile
Temperature Min. (Tsmin) 150°C
Temperature Max. (Tsmax) 200°C
Time (tS) from (Tsmin to Tsmax) 60–120 seconds
Ramp-up Rate (tL to tP) 3°C/second max.
Liquidous Temperature (TL) 217°C
Time (tL) Maintained Above (TL) 60–150 seconds
Peak Body Package Temperature 260°C +0°C / –5°C
Time (tP) within 5°C of 260°C 30 seconds
Ramp-down Rate (TP to TL) 6°C/second max.
Time 25°C to Peak Temperature 8 minutes max.
Time (seconds)
Temperature (°C)
Time 25°C to Peak
260
240
220
200
180
160
140
120
100
80
60
40
20
0
TL
ts
tL
tP
TP
Tsmax
Tsmin
120
Preheat Area
Max. Ramp-up Rate = 3°C/S
Max. Ramp-down Rate = 6°C/S
240 360
©2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2742A, FOD2742B, FOD2742C Rev. 1.0.1 16
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As used herein:
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Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing counterfeiting of their parts.
Customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substandard performance, failedapplications,
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counterfeit parts. Fairchild strongly encourages customers to purchase Fairchild parts either directly from Fairchild or from Authorized Fairchild Distributors who are
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification Product Status Definition
Advance Information Formative / In Design Datasheet contains the design specifications for product development. Specifications may change in
any manner without notice.
Preliminary Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild
Semiconductor reserves the right to make changes at any time without notice to improve design.
No Identification Needed Full Production Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes
at any time without notice to improve the design.
Obsolete Not In Production Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor.
The datasheet is for reference information only.
Rev. I40
First Production
FOD2742A, FOD2742B, FOD2742C — Optically Isolated Error Amplifier
