FOD2741BSD [ONSEMI]
8引脚DIP误差放大器光电耦合器;型号: | FOD2741BSD |
厂家: | ONSEMI |
描述: | 8引脚DIP误差放大器光电耦合器 放大器 输出元件 光电 |
文件: | 总18页 (文件大小:502K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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August 2008
FOD2741A, FOD2741B, FOD2741C
Optically Isolated Error Amplifier
Features
Description
■ Optocoupler, precision reference and error amplifier in
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%.
single package
■ 2.5V reference
■ CTR 100% to 200%
■ 5,000V RMS isolation
■ UL approved E90700, Volume 2
CSA approval 1296837
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.
VDE approval 40002463
BSI approval 8702, 8703
■ Low temperature coefficient 50ppm/°C max.
■ FOD2741A: tolerance 0.5%
FOD2741B: tolerance 1%
FOD2741C: tolerance 2%
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.
Applications
■ Power supplies regulation
■ DC to DC converters
Functional Bock Diagram
Package Outlines
NC
LED
1
8
8
1
C
E
FB
2
3
4
7
6
5
COMP
GND
8
8
NC
1
1
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
Pin Definitions
Pin Number
Pin Name
Pin 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
FOD2741
2
3
8
6
7
R1
R2
5
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C 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
°C
°C
STG
T
Operating Temperature
Lead Solder Temperature
Input Voltage
-40 to +85
OPR
T
260 for 10 sec.
°C
SOL
V
37
20
30
7
V
LED
LED
I
Input DC Current
mA
V
V
V
Collector-Emitter Voltage
Emitter-Collector Voltage
Collector Current
CEO
V
ECO
I
50
145
85
145
mA
mW
mW
mW
C
(1)
PD1
PD2
PD3
Input Power Dissipation
(2)
Transistor Power Dissipation
(3)
Total Power Dissipation
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.
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
3
Electrical Characteristics (T = 25°C unless otherwise specified)
A
Input Characteristics
Symbol
Parameter
Test Conditions
Device Min. Typ. Max. Unit
V
LED Forward Voltage
Reference Voltage
I
I
= 10mA, V
= 10mA, V
= V (Fig.1)
All
1.5
V
V
F
LED
COMP
COMP
FB
V
= V
FOD2741A 2.482 2.495 2.508
FOD2741B 2.470 2.495 2.520
FOD2741C 2.450 2.500 2.550
REF
LED
FB
V
V
(4)
V
Deviation of V
Temperature
Over T = -25°C to +85°C
All
4.5
17
mV
REF (DEV)
REF
A
∆V
∆V
/
Ratio of V
to the Output of the
Error Amplifier
Variation
I
I
= 10mA ∆V
∆V
= 10V to V
REF
All
-1.0
-0.5
-2.7 mV/V
-2.0
REF
REF
LED
LED
COMP
COMP
COMP
= 36V to 10V
I
Feedback Input
Current
= 10mA, R = 10kΩ (Fig. 3)
All
All
1.5
0.4
4
µA
µA
REF
1
(4)
I
Deviation of I
Temperature
Over T = -25°C to +85°C
1.2
REF (DEV)
REF
A
I
Minimum Drive Current V
= V (Fig. 1)
All
All
0.45
0.05
1.0
1.0
mA
µA
LED (MIN)
COMP
FB
I
Off-state Error
V
= 37V, V = 0 (Fig. 4)
LED FB
(OFF)
Amplifier Current
|Z
|
Error Amplifier Output
impedance
V
= V , I
= 1mA to 20mA,
All
0.15
0.5
Ω
OUT
COMP
REF LED
(5)
f ≥ 1.0 kHz
Output Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
Collector Dark Current
V
= 10V (Fig. 5)
50
nA
V
CEO
CE
BV
BV
Emitter-Collector Voltage Breakdown
Collector-Emitter Voltage Breakdown
I = 100µA
7
ECO
CEO
E
I
= 1.0mA
70
V
C
Transfer Characteristics
Parameter
Symbol
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
I
= 10mA, V
= 2.5mA (Fig. 6)
= V
0.4
V
CE (SAT)
LED
COMP
FB,
C
Notes:
4. The deviation parameters V
and I
are defined as the differences between the maximum and
REF(DEV)
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
5. 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
ZOUT, TOT = ------- ≈ ZOUT × 1 + -------
∆I
R2
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
4
Electrical Characteristics (Continued) (T = 25°C unless otherwise specified)
A
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
(6)
V
= 3000 VDC
I-O
(6)
V
Withstand Insulation
Voltage
RH ≤ 50%, T = 25°C, t = 1 min.
5000
Vrms
ISO
A
(6)
12
R
Resistance (Input to Output)
V
= 500 VDC
10
Ω
I-O
I-O
Switching Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
BW
Bandwidth
(Fig. 7)
= 0mA, Vcm = 10 V
50
kHZ
CMH
Common Mode Transient
Immunity at Output HIGH
I
,
PP
1.0
kV/µs
LED
(7)
R = 2.2kΩ (Fig. 8)
L
CML
Common Mode Transient
Immunity at Output LOW
(I
= 1mA, Vcm = 10 V
1.0
kV/µs
LED
PP,
(7)
R = 2.2kΩ (Fig. 8)
L
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.
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C 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
7
6
3
V(LED)
7
V
V
R1
5
5
Figure 4. I(OFF) Test Circuit
I(LED)
Figure 3. IREF Test Circuit
ICEO
IC
8
8
2
2
VCE
VCE
6
7
6
7
3
3
V
VCOMP
VREF
5
5
Figure 5. ICEO Test Circuit
Figure 6. CTR, VCE(sat) Test Circuit
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
6
Test Circuits (Continued)
VCC = +5V DC
IF = 1mA
47Ω
8
7
6
5
1
4
2
3
RL
1µF
VOUT
VIN
0.47V
0.1 VPP
Figure 7. Frequency Response Test Circuit.
VCC = +5V DC
IF = 0mA (A)
IF = 1mA (B)
R1
2.2kΩ
8
7
6
5
1
4
VOUT
A B
2
3
VCM
_
+
10VP-P
Figure 8. CMH and CML Test Circuit
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C 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
T = 25°C
A
1.0
0.5
15
T
V
= 25°C
A
= V
V
= V
COMP FB
COMP
FB
10
5
0
0.0
-5
-0.5
-10
-15
-1.0
–1
0
1
2
3
-1
0
1
2
3
V
– CATHODE VOLTAGE (V)
V
– CATHODE VOLTAGE (V)
COMP
COMP
Fig. 10 – Reference Voltage vs. Ambient Temperature
= 10mA
Fig. 11 – Reference Current vs Ambient Temperature
2.510
2.508
2.506
2.504
2.502
2.500
2.498
2.496
2.494
2.492
2.490
1.30
1.25
1.20
1.15
1.10
1.05
I
= 10mA
LED
R1 = 10kΩ
I
LED
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
T
– AMBIENT TEMPERATURE (°C)
T
– AMBIENT TEMPERATURE (°C)
A
A
Fig. 12 – Off–State Current vs. Ambient Temperature
= 37V
Fig. 13 – Forward Current vs. Forward Voltage
20
15
10
5
100
V
CC
10
25°C
0°C
70°C
1
0.9
1.0
1.1
1.2
1.3
1.4
-40
-20
0
20
40
60
80
100
V
– FORWARD VOLTAGE (V)
T
– AMBIENT TEMPERATURE (°C)
F
A
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
8
Typical Performance Curves (Continued)
Fig. 14 – Dark Current vs. Ambient Temperature
Fig. 15 – Collector Current vs. Ambient Temperature
10000
30
25
20
15
10
5
V
= 10V
CE
V
CE
= 5V
1000
100
10
I
I
= 20mA
LED
LED
= 10mA
= 6mA
I
I
LED
LED
1
= 1mA
50
0.1
0
-40
-20
0
20
40
60
80
100
0
10
20
30
40
60
70
80
90
100
T
A
– AMBIENT TEMPERATURE (°C)
T
– AMBIENT TEMPERATURE (°C)
A
Fig. 16 – Current Transfer Ratio vs. LED Current
Fig. 17 – Saturation Voltage vs. Ambient Temperature
0.26
0.24
0.22
0.20
0.18
0.16
0.14
0.12
0.10
V
= 5V
CE
140
120
100
80
0°C
25°C
70°C
60
40
-40
-20
0
20
40
60
80
100
0
5
10
15
20
25
30
35
40
45
50
I
– FORWARD CURRENT (mA)
T
– AMBIENT TEMPERATURE (°C)
LED
A
Fig. 19 – Rate of Change Vref to Vout vs. Temperature
Fig. 18 – Collector Current vs. Collector Voltage
-0.32
35
30
25
20
15
10
5
T
A
= 25°C
-0.34
-0.36
-0.38
-0.40
I
= 20mA
= 10mA
LED
I
LED
-0.42
-0.44
-0.46
I
= 5mA
LED
I
= 1mA
8
LED
7
0
-60
-40
-20
0
20
40
60
80
100
120
0
1
2
3
4
5
6
9
10
TEMPERATURE (°C)
V
– COLLECTOR-EMITTER VOLTAGE (V)
CE
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
9
Typical Performance Curves (Continued)
Fig. 20 – Voltage Gain vs. Frequency
VCC=10V
IF=10mA
0
-5
RL = 100Ω
RL = 500Ω
RL = 1kΩ
-10
-15
0.1
1
10
100
1000
FREQUENCY (kHz)
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
10
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.
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.
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.
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 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.
Feedback
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.
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:
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 5.2µA. To achieve 0.5% accuracy, the
(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:
resistance of R
should be:
TOP
V
OUT – 2.5
---------------------------- > 1040µA
RTOP
10V – 5V
----------------------------------- < 800 µA or RCOLLECTOR > 6.25kΩ;
RCOLLECTOR
select 12kΩ to allow some margin.
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
11
Ordering Information
Option
Example Part Number
FOD2741A
Description
No Option
Standard Through Hole
S
SD
T
FOD2741AS
Surface Mount Lead Bend
Surface Mount; Tape and Reel
0.4" Lead Spacing
FOD2741ASD
FOD2741AT
V
FOD2741AV
VDE0884
TV
SV
SDV
FOD2741ATV
FOD2741ASV
FOD2741ASDV
VDE0884; 0.4” Lead Spacing
VDE0884; Surface Mount
VDE0884; Surface Mount; Tape and Reel
Marking Information
1
2
2741A
6
V XX YY B
5
3
4
Definitions
Fairchild logo
1
Device number
2
3
VDE mark (Note: Only appears on parts ordered with VDE
option – See order entry table)
Two digit year code, e.g., ‘03’
4
5
6
Two digit work week ranging from ‘01’ to ‘53’
Assembly package code
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
12
Carrier Tape Specifications
D0
P0
P2
t
E
K0
F
W
W1
P
User Direction of Feed
d
D1
Symbol
Description
Dimension in mm
16.0 0.3
0.30 0.05
4.0 0.1
W
t
Tape Width
Tape Thickness
P
Sprocket Hole Pitch
Sprocket Hole Diameter
Sprocket Hole Location
Pocket Location
0
D
1.55 0.05
1.75 0.10
7.5 0.1
0
E
F
P
4.0 0.1
2
P
Pocket Pitch
12.0 0.1
10.30 0.20
10.30 0.20
4.90 0.20
1.6 0.1
A
Pocket Dimensions
0
0
0
B
K
W
Cover Tape Width
1
d
Cover Tape Thickness
0.1 max
Max. Component Rotation or Tilt
Min. Bending Radius
10°
R
30
Reflow Profile
245C, 10–30 s
300
250
200
150
100
50
260C peak
Time above 183C, <160 sec
Ramp up = 2–10C/sec
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time (Minute)
• Peak reflow temperature: 260C (package surface temperature)
• Time of temperature higher than 183C for 160 seconds or less
• One time soldering reflow is recommended
©2004 Fairchild Semiconductor Corporation
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1
www.fairchildsemi.com
13
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