FOD2743B [FAIRCHILD]
OPTICALLY ISOLATED ERROR AMPLIFIER; 光隔离误差放大器
| 型号： | FOD2743B |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | OPTICALLY ISOLATED ERROR AMPLIFIER |
| 文件： | 总15页 (文件大小：617K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
DESCRIPTION
The FOD2743 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%.
8
1
The Current Transfer Ratio (CTR) ranges from 50% to 100%. 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 con-
verters.
8
When using the FOD2743, 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.
8
1
1
FEATURES
FUNCTIONAL BLOCK DIAGRAM
•
•
•
•
•
Optocoupler, precision reference and error amplifier in single package
2.5V reference
CTR 50% to 100% at 1mA
5,000V RMS isolation
LED
COMP
GND
FB
1
8
NC
UL approval E90700, Vol. 2
CSA approval 1296837
VDE approval pending
BSI approval pending
2
3
4
7
6
5
C
•
•
Low temperature coefficient 50 ppm/°C max
E
FOD2743A: tolerance 0.5%
FOD2743B: tolerance 1%
FOD2743C: tolerance 2%
NC
APPLICATIONS
•
•
Power supplies regulation
DC to DC converters
PIN DEFINITIONS
Pin Number
Pin Name
Pin function description
Anode LED. This pin is the input to the light emitting diode.
1
2
3
4
5
6
7
8
LED
COMP
GND
FB
Error Amplifier Compensation. This pin is the output of the error amplifier. *
Ground
Voltage Feedback. This pin is the inverting input to the error amplifier
NC
Not connected
E
Phototransistor Emitter
Phototransistor Collector
Not connected
C
NC
* The compensation network must be attached between pins 2 and 4.
© 2004 Fairchild Semiconductor Corporation
Page 1 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
TYPICAL APPLICATION
FAN4803
PWM
Control
V
1
V
O
FOD2743
7
1
2
4
3
R1
R2
6
ABSOLUTE MAXIMUM RATINGS (T = 25°C Unless otherwise specified.)
A
Parameter
Symbol
Value
Units
°C
°C
°C
V
T
Storage Temperature
Operating Temperature
Lead Solder Temperature
Input Voltage
-40 to +125
STG
T
-25 to +85
OPR
T
260 for 10 sec.
SOL
V
37
20
70
7
LED
I
Input DC Current
mA
V
LED
V
Collector-Emitter Voltage
Emitter-Collector Voltage
CEO
V
V
ECO
I
Collector Current
50
145
85
mA
mW
mW
mW
C
Input Power Dissipation
Transistor Power Dissipation
Total Power Dissipation (note 1)
PD1
PD2
PD3
145
Notes
1. See derating graph fig 21.
2. Functional operation under these conditions is not implied. Permanent damage may occur if the device is subjected to conditions
outside these ratings.
© 2004 Fairchild Semiconductor Corporation
Page 2 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
ELECTRICAL CHARACTERISTICS (T = 25°C Unless otherwise specified.)
A
INPUT CHARACTERISTICS
Parameter
Test Conditions Symbol
= V ) (fig.1)
Device Min.
Typ. Max. Unit
(I
= 1 mA, V
V
F
LED Forward Voltage
ALL
1.07
1.2
V
V
V
V
LED
COMP
FB
A
B
C
2.482 2.495 2.508
2.470 2.495 2.520
2.450 2.500 2.550
I
= 1 mA, V
= V
V
REF
Reference Voltage
LED
COMP
FB
Deviation of V
temperature
over
REF
T = -25°C to +85°C
V
REF (DEV)
ALL
ALL
4.5
17
mV
A
∆V
= 10V to V
REF
-0.4
-0.3
2
-2.7
-2.0
4
∆V
/
COMP
Ratio of V
variation to the
mV/
V
REF
REF
I
= 1 mA
LED
∆V
output of the error amplifier
∆V
= 36V to 10V
COMP
COMP
I
= 1mA, R = 10kΩ (fig 3)
I
Feedback Input Current
ALL
ALL
µA
µA
LED
1
REF
Deviation of I
temperature
over
REF
T = -25°C to +85°C
I
REF (DEV)
1
1.2
A
V
= V (fig.1)
I
LED (MIN)
Minimum Drive Current
ALL
ALL
0.45
1.0
1.0
mA
µA
COMP
FB
V
= 37V, V = 0 (fig 4.)
I
Off-state error amplifier current
0.001
LED
FB
(OFF)
V
= V , I
= 1mA to 20mA,
Error amplifier output impedance
(see note 2)
COMP
REF LED
|Z
|
ALL
0.15
0.5
Ω
OUT
f ≥ 1.0 kHz
1. The deviation parameters V
and I
are defined as the differences between the maximum and minimum values
REF(DEV)
REF(DEV)
obtained over the rated temperature range.The average full-range temperature coefficient of the reference input voltage, ∆V
,
REF
is defined as:
{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 resistors (see
OUT
COMP LED
Figure 2), the total dynamic impedance of the circuit is given by:
∆V R1
ZOUT, TOT = ------- ≈ ZOUT × 1 + -------
∆I R2
© 2004 Fairchild Semiconductor Corporation
Page 3 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
OUTPUT CHARACTERISTICS (T = 25°C Unless otherwise specified.)
A
Parameter
Test Conditions
Symbol
Min
Typ
1
Max
Unit
nA
V
(V = 10 V) (Fig. 5)
I
Collector dark current
50
CE
CEO
(I = 100 µA)
BV
Emitter-collector voltage breakdown
Collector-emitter voltage breakdown
7
10
E
ECO
(I = 1.0mA)
BV
70
100
V
C
CEO
TRANSFER CHARACTERISTICS (T = 25°C Unless otherwise specified.)
A
Parameter
Test Conditions Symbol
Min
Typ
Max
Unit
(I
= 1 mA, V
= V
,
LED
COMP
FB
Current transfer ratio
CTR
50
100
%
V
= 5 V) (Fig. 6)
CE
(I
= 1 mA, V
= V
Collector-emitter
saturation voltage
LED
COMP FB,
V
0.4
V
CE (SAT)
I = 0.1 mA) (Fig. 6)
C
ISOLATION CHARACTERISTICS (T = 25°C Unless otherwise specified.)
A
Parameter
Test Conditions Symbol
Min
Typ
Max
Unit
(RH = 45%, T = 25°C, t = 5s,
Input-output insulation
leakage current
A
I
1.0
µA
I-O
V
= 3000 VDC) (note. 1)
I-O
(RH <= 50%, T = 25°C, t = 1 min)
Withstand insulation
voltage
A
V
5000
Vrms
Ohm
ISO
(notes. 1)
12
V
= 500 VDC (note. 1)
R
I-O
Resistance (input to output)
10
I-O
SWITCHING CHARACTERISTICS (T = 25°C Unless otherwise specified.)
A
Parameter
Test Conditions Symbol
Min
Typ
Max
Unit
Bandwidth
(Fig. 7)
= 0 mA, Vcm = 10 V
RL = 2.2 kΩ (Fig. 8) (note. 2)
BW
50
kHZ
(I
(I
Common mode transient
immunity at output high
LED
PP
CMH
1.0
1.0
kV/µs
kV/µs
= 1 mA, Vcm = 10 V
Common mode transient
immunity at output low
LED
PP
CML
RL = 2.2 kΩ (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 com-
mon 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
Page 4 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
I(LED)
I(LED)
1
7
1
7
6
VF
2
4
R1
2
4
6
V
V
VCOMP
VREF
R2
VREF
3
3
FIG. 1. VREF, VF, ILED (min) TEST CIRCUIT
FIG. 2. ∆VREF/∆VCOMP TEST CIRCUIT
I(LED)
I(OFF)
1
7
6
1
7
IREF
2
2
6
V(LED)
4
4
V
V
R1
3
3
FIG. 3. IREF TEST CIRCUIT
FIG. 4. I(OFF) TEST CIRCUIT
I(LED)
ICEO
IC
1
1
7
7
6
VCE
VCE
2
4
2
6
4
VCOMP
VREF
V
3
3
FIG. 5. ICEO TEST CIRCUIT
FIG. 6. CTR, VCE(sat) TEST CIRCUIT
© 2004 Fairchild Semiconductor Corporation
Page 5 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
VCC = +5V DC
IF = 1 mA
47Ω
8
7
6
5
1
4
2
3
RL
1µf
VOUT
VIN
0.47V
0.1 VPP
Fig. 7 Frequency Response Test Circuit
VCC = +5V DC
IF = 0 mA (A)
IF = 1 mA (B)
R1
2.2kΩ
8
7
6
5
1
4
2
3
VOUT
A B
VCM
_
+
10VP-P
Fig. 8 CMH and CML Test Circuit
© 2004 Fairchild Semiconductor Corporation
Page 6 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
TYPICAL PERFORMANCE CURVES
Fig. 9a – LED Current vs. Cathode Voltage
Fig. 9b – LED Current vs. Cathode Voltage
1.0
0.5
15
T
V
= 25°C
T
V
= 25°C
A
= V
COMP FB
A
= V
COMP
FB
10
5
0
0.0
-5
-0.5
-1.0
-10
-15
-1
0
1
2
3
-1
0
1
2
3
V
- Cathode Voltage (V)
V
- Cathode Voltage (V)
COMP
COMP
Fig. 10 – Reference Voltage Variation vs. Ambient Temperature
1.0
Fig. 11 – Reference Current vs Ambient Temperature
4.0
3.5
3.0
2.5
2.0
1.5
1.0
I
= 1mA, 10mA
LED
I
= 1mA, 10mA
LED
0.8
0.6
R1 = 10kΩ
Normalized to T = 25°C
A
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-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
Fig. 13 – Forward Current vs. Forward Voltage
20
15
10
5
100
10
1
V
CC
= 37V
25°C
0°C
70°C
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
A
- Ambient Temperature (°C)
F
© 2004 Fairchild Semiconductor Corporation
Page 7 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
Fig. 15 – Collector Current vs. Ambient Temperature
Fig. 14 – Dark Current vs. Ambient Temperature
= 10V
32
V
1.6
10000
1000
100
10
V
= 5V
CE
CE
28
24
20
16
12
8
1.4
I
I
= 20mA
= 1mA
LED
1.2
1.0
0.8
0.6
0.4
0.2
0.0
LED
I
I
= 10mA
= 5mA
LED
LED
1
4
0.1
0
-40
-40
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
T
A
- Ambient Temperature (°C)
T
A
- Ambient Temperature (°C)
Fig. 16 – Current Transfer Ratio vs. LED Current
= 5V
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
0.08
0.06
160
140
120
100
80
V
CE
25°C
0°C
I
I
= 10mA
LED
= 2.5mA
C
I
I
= 1mA
LED
= 0.1mA
-40°C
C
60
70°C
40
20
0
100°C
-40
-20
0
T
20
40
60
80
100
0.1
1
10
I
- Forward Current (mA)
- Ambient Temperature (°C)
LED
A
Fig. 19 – Rate of Change Vref to Vout vs. Temperature
Fig. 18 – Collector Current vs. Collector Voltage
-0.32
-0.34
-0.36
-0.38
-0.40
35
30
25
20
15
10
5
T
= 25°C
A
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
VCE - Collector-Emitter Voltage (V)
Temperature - °C
© 2004 Fairchild Semiconductor Corporation
Page 8 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
Fig. 20 – Voltage Gain vs. Frequency
5
V
= 10V
CC
0
I
= 10mA
F
R
= 500 Ω
L
I
R
= 1mA
F
-5
= 2.4kΩ
L
I
= 10mA
F
R
= 100Ω
L
I
= 10mA
F
R
= 1kΩ
L
-10
-15
1
10
100
Frequency - kHz
1000
Fig. 21 – Package Power Dissipation
vs Ambient Temperature
200
150
100
50
0
-40
-20
0
20
40
60
80
100
Ta - Ambient Temperature - C
© 2004 Fairchild Semiconductor Corporation
Page 9 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
The FOD2743
Compensation
The FOD2743 is an optically isolated error amplifier. It incor-
porates 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.
The compensation pin of the FOD2743 provides the opportu-
nity 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.
Powering the Secondary Side
The LED pin in the FOD2743 powers the secondary side, and
in particular provides the current to run the LED. The actual
structure of the FOD2743 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
+ 1.2V = 3.7V. This voltage can be generated either directly
from the output of the converter, or else from a slaved second-
ary winding. The secondary winding will not affect regulation,
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 FOD2743. In a normal
configuration the collector will be attached to a pull-up resistor
and the emitter grounded. There is no base connection neces-
sary.
Feedback
The value of the pull-up resistor, and the current limiting resis-
tor 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
FOD2743 attempts to regulate its FB pin to the reference
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 FAN4803, 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 50%, so the minimum collector
current of the photo-transistor when the diode is full on is
400µA. The collector resistor must thus be such that:
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 resistance of
R
should be:
TOP
V
OUT – 2.5
> 1040µA
----------------------------
RTOP
10V – 5V
----------------------------------- < 400 µA or RCOLLECTOR > 12.5kΩ;
RCOLLECTOR
select 20kΩ to allow some margin.
© 2004 Fairchild Semiconductor Corporation
Page 10 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
Package Dimensions (Through Hole)
Package Dimensions (Surface Mount)
0.390 (9.91)
0.370 (9.40)
PIN 1
ID.
PIN 1
ID.
0.270 (6.86)
0.250 (6.35)
0.270 (6.86)
0.250 (6.35)
0.390 (9.91)
0.370 (9.40)
0.300 (7.62)
TYP
0.070 (1.78)
0.045 (1.14)
0.070 (1.78)
0.045 (1.14)
0.020 (0.51)
MIN
0.016 (0.41)
0.008 (0.20)
0.020 (0.51) MIN
0.200 (5.08)
0.140 (3.55)
0.154 (3.90)
0.120 (3.05)
0.045 [1.14]
0.022 (0.56)
0.016 (0.41)
0.022 (0.56)
0.016 (0.41)
15° MAX
0.315 (8.00)
MIN
0.016 (0.40)
0.008 (0.20)
0.100 (2.54)
TYP
0.300 (7.62)
TYP
0.100 (2.54) TYP
0.405 (10.30)
MIN
Lead Coplanarity : 0.004 (0.10) MAX
Package Dimensions (0.4"Lead Spacing)
8 - Pin Dip
PIN 1
ID.
0.070 (1.78)
0.270 (6.86)
0.250 (6.35)
0.060 (1.52)
0.390 (9.91)
0.370 (9.40)
0.100 (2.54)
0.295 (7.49)
0.415 (10.54)
0.030 (0.76)
0.070 (1.78)
0.045 (1.14)
0.004 (0.10) MIN
0.200 (5.08)
0.140 (3.55)
0.154 (3.90)
0.120 (3.05)
0.022 (0.56)
0.016 (0.41)
0° to 15°
0.016 (0.40)
0.008 (0.20)
0.400 (10.16)
TYP
0.100 (2.54) TYP
NOTE
All dimensions are in inches (millimeters)
© 2004 Fairchild Semiconductor Corporation
Page 11 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
ORDERING INFORMATION
Example: FOD2743A
X
Y
X
Y
Packaging Option
T: 0.4” Lead Spacing
V: VDE tested
S: Surface Mount Lead Bend
SD: Surface Mount Tape and Reel (1000 per reel)
MARKING INFORMATION
1
2
6
2743A
V XX YY B
5
3
4
Definitions
1
2
Fairchild logo
Device number
VDE mark (Note: Only appears on parts ordered with VDE
option – See order entry table)
3
4
5
6
Two digit year code, e.g., ‘03’
Two digit work week ranging from ‘01’ to ‘53’
Assembly package code
© 2004 Fairchild Semiconductor Corporation
Page 12 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
Carrier Tape Specifications
D0
P0
P2
t
K0
E
F
W
W1
P
D1
d
User Direction of Feed
Description
Symbol
Dimension in mm
Tape Width
W
t
16.0 0.3
0.30 0.05
4.0 0.1
1.55 0.05
1.75 0.10
7.5 0.1
4.0 0.1
12.0 0.1
10.30 0.20
10.30 0.20
4.90 0.20
1.6 0.1
0.1 max
Tape Thickness
Sprocket Hole Pitch
Sprocket Hole Diameter
Sprocket Hole Location
P
0
D
0
E
F
Pocket Location
Pocket Pitch
P
2
P
A
0
0
0
Pocket Dimensions
B
K
Cover Tape Width
W
1
Cover Tape Thickness
d
Max. Component Rotation or Tilt
Min. Bending Radius
10°
R
30
© 2004 Fairchild Semiconductor Corporation
Page 13 of 15
4/8/04
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
Fig. 22 Recommended IR Reflow Profile
• Peak reflow temperature
• Time of temperature higher than 245°C
• Number of reflows
260° C (package surface temperature)
40 seconds or less
Three
10 s
300
250
200
150
100
50
260°
245°
40 s
50
100
150
200
250
Time (s)
© 2004 Fairchild Semiconductor Corporation
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OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A
FOD2743B
FOD2743C
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.
© 2004 Fairchild Semiconductor Corporation
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