FOD2712AR2V [ONSEMI]
8引脚SOIC误差放大器光耦合器;
| 型号： | FOD2712AR2V |
| 厂家： | 
ONSEMI |
| 描述： | 8引脚SOIC误差放大器光耦合器 放大器 输出元件 光电 |
| 文件： | 总17页 (文件大小：748K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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December 2010
FOD2712A
Optically Isolated Error Amplifier
Features
Description
■ Optocoupler, precision reference and error amplifier in
The FOD2712A Optically Isolated Amplifier consists of
the popular AZ431L precision programmable shunt ref-
erence and an optocoupler. The optocoupler is a gallium
arsenide (GaAs) light emitting diode optically coupled to
a silicon phototransistor. The reference voltage toler-
ance is 1ꢀ. The current transfer ratio (CTR) ranges from
100ꢀ to 200ꢀ.
single package
■ 1.240V 1ꢀ reference
■ CTR 100ꢀ to 200ꢀ
■ 2,500V RMS isolation
■ UL approval E90700
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.
Applications
■ Power system for workstations
■ Telecom central office supply
■ Telecom bricks
When using the FOD2712A, 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 compact 8-pin small outline
package.
Schematic
Package Outline
1
8
LED
FB
NC
C
2
3
4
7
6
5
E
COMP
GND
NC
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
Pin Definitions
Pin Number
Pin Name
Functional Description
1
2
3
4
5
6
7
8
NC
C
Not connected
Phototransistor Collector
Phototransistor Emitter
Not connected
E
NC
GND
COMP
FB
Ground
Error Amplifier Compensation. This pin is the output of the error amplifier.*
Voltage Feedback. This pin is the inverting input to the error amplifier
Anode LED. This pin is the input to the light emitting diode.
LED
*The compensation network must be attached between pins 6 and 7.
Typical Application
FAN4803
PWM
Control
V1
VO
FOD2712A
2
3
8
6
7
R1
R2
5
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
2
Absolute Maximum Ratings (T = 25°C unless otherwise specified)
A
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.
Symbol
Parameter
Value
Units
T
Storage Temperature
-40 to +125
-40 to +85
°C
°C
STG
T
Operating Temperature
Reflow Temperature Profile (refer to 15)
Input Voltage
OPR
V
13.2
20
V
LED
I
Input DC Current
mA
V
LED
V
V
Collector-Emitter Voltage
Emitter-Collector Voltage
Collector Current
30
CEO
7
V
ECO
I
50
mA
mW
mW
mW
C
(1)
PD1
PD2
PD3
Input Power Dissipation
145
85
(2)
Transistor Power Dissipation
(3)
Total Power Dissipation
145
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.
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
3
Electrical Characteristics (V = 12V, T = 25°C unless otherwise specified)
CC
A
Input Characteristics
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
LED Forward Voltage
I
= 10mA, V
= V
FB
1.5
V
F
LED
COMP
(Fig.1)
V
Reference Voltage
-40°C to +85°C
25°C
V
= V , I
= 10mA
REF
COMP
FB LED
(Fig.1)
1.221
1.259
V
1.228 1.240 1.252
V
Deviation of V
See Note 1
over temperature
T = -40 to +85°C
4
12
mV
REF (DEV)
REF
A
∆V
Ratio of Vref Variation to the Output of the
Error Amplifier
I
V
= 10 mA,
= V
-1.5
-2.7 mV/V
REF
LED
to 12V
REF
∆V
COMP
COMP
(Fig. 2)
I
Feedback Input Current
I
= 10mA, R1 = 10kΩ
0.15
0.15
0.5
0.3
µA
µA
REF
LED
(Fig. 3)
T = -40 to +85°C
I
Deviation of I Over Temperature
REF
REF (DEV)
A
See Note 1
I
Minimum Drive Current
V
V
= V (Fig.1)
55
80
µA
µA
Ω
LED (MIN)
COMP
FB
I
Off-state Error Amplifier Current
= 6V, V = 0 (Fig.4)
0.001
0.25
0.1
(OFF)
LED
FB
|Z
|
Error Amplifier Output Impedance
See Note 2
V
I
= V
,
OUT
COMP
FB
= 0.1mA to 15mA,
LED
f < 1kHZ
are defined as the differences between the maximum and
REF(DEV)
Notes:
1. The deviation parameters V
and I
REF(DEV)
minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the
reference input voltage, ∆V , is defined as:
REF
{VREF(DEV)/VREF(TA = 25°C)} × 106
∆VREF (ppm/°C) = ----------------------------------------------------------------------------------------------------
∆TA
where ∆T is the rated operating free-air temperature range of the device.
A
2. The dynamic impedance is defined as |Z
| = ∆V
/∆I
. When the device is operating with two external
OUT
COMP LED
resistors (see Figure 2), the total dynamic impedance of the circuit is given by:
∆V
R1
R2
ZOUT, TOT = ------- ≈ ZOUT × 1 + -------
∆I
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
4
Electrical Characteristics (V = 12V, T = 25°C unless otherwise specified) (Continued)
CC
A
Output Characteristics
Symbol Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
Collector Dark Current
V
= 10V (Fig. 5)
50
nA
V
CEO
CE
BV
Collector-Emitter Voltage
Breakdown
I = 1.0mA
70
7
CEO
C
BV
Emitter-Collector Voltage
Breakdown
I = 100µA
V
ECO
E
Transfer Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
CTR
Current Transfer Ratio
I
= 10mA, V
= V ,
FB
100
200
%
LED
COMP
V
= 5V (Fig. 6)
CE
V
Collector-Emitter
Saturation Voltage
I
= 10mA, V
= V ,
FB
0.4
V
CE (SAT)
LED
COMP
I = 2.5mA (Fig. 6)
C
Isolation Characteristics
Symbol Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
Input-Output Insulation
Leakage Current
RH = 45%, T = 25°C, t = 5s,
1.0
µA
I-O
A
V
= 3000 VDC (Note 1)
I-O
V
Withstand Insulation Voltage RH ≤ 50%, T = 25°C,
2500
Vrms
ISO
A
t = 1 min. (Note 1)
12
R
Resistance (Input to Output)
V
= 500 VDC (Note 1)
10
Ω
I-O
I-O
Switching Characteristics
Symbol Parameter
Test Conditions
Min.
Typ.
Max.
Unit
B
Bandwidth
Fig. 7
= 0mA, V = 10 V
PP
10
kHz
W
CMH
Common Mode Transient
Immunity at Output HIGH
I
1.0
kV/µs
LED
cm
RL = 2.2kΩ (Fig. 8) (Note 2)
= 10mA, V = 10 V
PP
CML
Common Mode Transient
Immunity at Output LOW
I
1.0
kV/µs
LED
cm
RL = 2.2kΩ (Fig. 8) (Note 2)
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.
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
5
Test Circuits
I(LED)
I(LED)
8
2
3
8
2
3
VF
6
7
R1
6
7
V
V
VCOMP
VREF
R2
VREF
5
5
Figure 1. VREF, VF, ILED (min) Test Circuit
Figure 2. ∆VREF/∆VCOMP Test Circuit
I(LED)
I(OFF)
8
2
3
8
2
IREF
6
6
3
V(LED)
7
7
V
V
R1
5
5
Figure 3. IREF Test Circuit
Figure 4. I(OFF) Test Circuit
I(LED)
ICEO
I(C)
8
8
2
2
3
VCE
VCE
6
7
6
3
7
V
VCOMP
VREF
5
5
Figure 5. ICEO Test Circuit
Figure 6. CTR, VCE(sat) Test Circuit
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
6
Test Circuits (Continued)
VCC = +5V DC
IF = 10 mA
47Ω
1
2
3
4
8
7
6
5
RL
1µf
VOUT
VIN
0.47V
0.1 VPP
Figure 7. Frequency Response Test Circuit
V
CC = +5V DC
IF = 0 mA (A)
IF = 10 mA (B)
R1
2.2kΩ
1
8
7
6
5
VOUT
2
3
4
A B
VCM
_
+
10VP-P
Figure 8. CMH and CML Test Circuit
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
7
Typical Performance Curves
Fig. 9a LED Current vs. Cathode Voltage
Fig. 9b LED Current vs. Cathode Voltage
15
10
5
150
120
90
TA = 25°C
VCOMP = VFB
TA = 25°C
VCOMP = VFB
60
30
0
0
-30
-60
-90
-120
-150
-5
-10
-15
-1.0
-1.0
-0.5
0.0
0.5
1.0
1.5
-0.5
0.0
0.5
1.0
1.5
VCOMP – CATHODE VOLTAGE (V)
VCOMP – CATHODE VOLTAGE (V)
Fig. 10 Reference Voltage vs. Ambient Temperature
Fig. 11 Reference Current vs. Ambient Temperature
1.254
350
ILED = 10mA
ILED = 10mA
R1 = 10kΩ
300
250
200
150
100
50
1.248
1.242
1.236
1.230
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
100
TA – AMBIENT TEMPERATURE (°C)
TA – AMBIENT TEMPERATURE (°C)
Fig. 12 Off Current vs. Ambient Temperature
100
10
1
VLED = 13.2V
V
FB = 0
0.1
-40
-20
0
20
40
60
80
100
TA – AMBIENT TEMPERATURE (°C)
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
8
Typical Performance Curves (Continued)
Fig.13 LED Forward Current vs. Forward Voltage
Fig.14 Dark Current vs.Temperature
20
VCE = 10V
1000
100
10
15
70°C
10
25°C
0°C
5
1
0
0.95
0.1
-40
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
-20
0
20
40
60
80
100
VF – FORWARD VOLTAGE (V)
TA – AMBIENT TEMPERATURE (°C)
Fig. 15 Collector Current vs. Ambient Temperature
Fig. 16 Current Transfer Ratio vs. LED Current
30
25
20
15
10
5
160
140
120
100
80
V
CE = 5V
VCE = 5V
ILED = 20mA
0°C
ILED = 10mA
25°C
70°C
60
ILED = 5mA
ILED = 1mA
40
20
0
0
-40
-20
0
20
40
60
80
100
0
10
20
30
40
50
ILED – FORWARD CURRENT (mA)
TA – AMBIENT TEMPERATURE (°C)
Fig. 17 Saturation Voltage vs. Ambient Temperature
0.22
0.20
0.18
0.16
0.14
0.12
0.10
-40
-20
0
20
40
60
80
100
TA – AMBIENT TEMPERATURE (°C)
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
9
Typical Performance Curves (Continued)
Fig. 19 Delta V
/Delta V
vs. Ambient Temperature
Fig. 18 Collector Current vs. Collector Voltage
REF
COMP
1
45
TA = 25°C
40
35
ILED = 20 mA
0
-1
-2
30
25
20
ILED = 10 mA
15
10
ILED = 5 mA
5
ILED = 1 mA
0
-40
-20
0
20
40
60
80
100
0
1
2
3
4
5
6
7
8
9
10
VCE – COLLECTOR-EMITTER VOLTAGE (V)
TA – AMBIENT TEMPERATURE (°C)
Fig. 20 Voltage Gain vs. Frequency
0
-5
100Ω
500Ω
-10
RL=1kΩ
-15
10
100
1000
FREQUENCY kHz
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
10
The FOD2712A
Compensation
The FOD2712A 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 AZ431L shunt volt-
age regulator plus the CNY17F-3 optocoupler.
The compensation pin of the FOD2712A 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
Supplies” by Ron Lenk, IEEE Press, 1998.
Powering the Secondary Side
The LED pin in the FOD2712A powers the secondary
side, and in particular provides the current to run the
LED. The actual structure of the FOD2712A 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 1.24V + 1.5V = 2.74V.
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.
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.
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.
Photo-Transistor
The Photo-transistor is the output of the FOD2712A. 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.
Feedback
Output voltage of a converter is determined by selecting
a resistor divider from the regulated output to the FB pin.
The FOD2712A attempts to regulate its FB pin to the ref-
erence voltage, 1.24V. The ratio of the two resistors
should thus be:
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:
RTOP
------------------------- = -------------- – 1
RBOTTOM VREF
VOUT
The absolute value of the top resistor is set by the input
offset current of 0.8µA. To achieve 1ꢀ accuracy, the
(12V–2.74V) /10KΩ = 926µA.
resistance of R
should be:
TOP
The CTR of the opto-isolator is a minimum of 100ꢀ, and
so the minimum collector current of the photo-transistor
when the diode is full on is also 926µA. The collector
resistor must thus be such that:
V
OUT – 1.24
------------------------------- > 80 µA
RTOP
10V – 5V
----------------------------------- < 926 µA or RCOLLECTOR > 5.4KΩ;
RCOLLECTOR
select 10KΩ to allow some margin.
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
11
Ordering Information
Option
V
Example Part Number
Description
FOD2712AV
FOD2712AR2
FOD2712AR2V
VDE 0884
R2
Tape and reel (2500 units per reel)
R2V
VDE 0884, Tape and reel (2500 units per reel)
Marking Information
1
2
2712A
6
V
X YY S
5
3
4
Definitions
1
2
3
Fairchild logo
Device number
VDE mark (Note: Only appears on parts ordered with VDE
option – See order entry table)
4
5
6
One digit year code, e.g., ‘3’
Two digit work week ranging from ‘01’ to ‘53’
Assembly package code
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
12
Carrier Tape Specifications
8.0 0.10
2.0 0.05
3.50 0.20
0.30 MAX
Ø1.5 MIN
1.75 0.10
4.0 0.10
5.5 0.05
12.0 0.3
8.3 0.10
5.20 0.20
Ø1.5 0.1
0.1 MAX
User Direction of Feed
6.40 0.20
Dimensions in mm
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
13
Reflow Profile
Max. Ramp-up Rate = 3°C/S
Max. Ramp-down Rate = 6°C/S
T
P
260
240
220
200
180
160
140
120
100
80
t
P
T
L
Tsmax
t
L
Preheat Area
Tsmin
t
s
60
40
20
0
120
Time 25°C to Peak
240
360
Time (seconds)
Profile Freature
Pb-Free Assembly Profile
150°C
Temperature Min. (Tsmin)
Temperature Max. (Tsmax)
200°C
Time (t ) from (Tsmin to Tsmax)
60–120 seconds
3°C/second max.
217°C
S
Ramp-up Rate (t to t )
L
P
Liquidous Temperature (T )
L
Time (t ) Maintained Above (T )
60–150 seconds
260°C +0°C / –5°C
30 seconds
L
L
Peak Body Package Temperature
Time (t ) within 5°C of 260°C
P
Ramp-down Rate (T to T )
6°C/second max.
8 minutes max.
P
L
Time 25°C to Peak Temperature
©2010 Fairchild Semiconductor Corporation
FOD2712A Rev. 1.0.1
www.fairchildsemi.com
14
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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
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