Fairchild FAN431L Programmable shunt regulator Datasheet

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FAN431/FAN431A/FAN431L
Programmable Shunt Regulator
Features
Description
•
•
•
•
The FAN431/FAN431A/FAN431L are three terminal
output adjustable regulators with thermal stability over
operating temperature range. The output voltage can be set
any value between VREF (approximately 2.5 volts) and 36
volts with two external resistors. These devices have a
typical dynamic output impedance of 0.2Ω Active output
circuit provides a sharp turn-on characteristic, making these
devices excellent replacement for Zener Diodes in many
applications.
Programmable Output Voltage to 36 Volts
Low Dynamic Output Impedance 0.20 Typical
Sink Current Capability of 1.0 to 100mA
Equivalent Full-Range Temperature Coefficient of
50ppm/°C Typical
• Temperature Compensated for Operation Over Full Rated
Operating Temperature Range
• Low Output Noise Voltage
• Fast Turn-on Response
TO-92
1
1. Ref 2. Anode 3. Cathode
Internal Block Diagram
CATHODE
REFERENCE
2.5 Vref
ANODE
CATHODE (K)
REFERENCE (R)
ANODE(A)
Rev. 1.0.1
©2003 Fairchild Semiconductor Corporation
FAN431/FAN431A/FAN431L
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Parameter
Symbol
Value
Unit
Cathode Voltage
VKA
37
V
Cathode current Range (Continuous)
IKA
-100 ~ +150
mA
Reference Input Current Range
IREF
-0.05 ~ +10
mA
Thermal Resistance Junction-Air (Note1,2)
Z Suffix Package
RθJA
132
°C/W
Power Dissipation (Note3,4)
Z Suffix Package
PD
940
mW
Junction Temperature
TJ
150
°C
Operating Temperature Range
TOPR
-25 ~ +85
°C
Storage Temperature Range
TSTG
-65 ~ +150
°C
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm (1S0P)
JEDEC Standard: JESD51-3, JESD51-7
2. Assume no ambient airflow.
3. TJMAX = 150°C, Ratings apply to ambient temperature at 25°C
4. Power dissipation calculation: PD = (TJ - TA)/RθJA
Recommended Operating Conditions
Parameter
2
Symbol
Min.
Typ.
Max.
Unit
Cathode Voltage
VKA
VREF
-
36
V
Cathode Current
IKA
1.0
-
100
mA
FAN431/FAN431A/FAN431L
Electrical Characteristics
(TA = +25°C, unless otherwise specified)
Parameter
Symbol
Reference
Input Voltage
VREF
VKA=VREF, IKA=10mA
Deviation of
Reference
Input Voltage
OverTemperature
∆VREF/
∆T
VKA=VREF, IKA=10mA
TMIN≤TA≤TMAX
Ratio of
Change in
Reference
Input Voltage
to the Change
in Cathode
Voltage
∆VREF/
∆VKA
Conditions
IKA
=10mA
∆VKA=10VVREF
FAN431
FAN431A
FAN431L
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
-
-
4.5
17
-1.0
-2.7
-
-
4.5
17
-1.0
-2.7
-
-
4.5
17
-1.0
-2.7
Unit
V
mV
mV/V
∆VKA=36V10V
-
-0.5
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
IKA=10mA,
R1=10kΩ,R2=∞
-
1.5
4
-
1.5
4
-
1.5
4
µA
Deviation of
Reference
Input Current
Over Full
Temperature
Range
IKA=10mA,
R1=10kΩ,R2=∞
∆IREF/∆T
TA =Full Range
-
0.4
1.2
0.4
1.2
0.4
1.2
µA
Minimum
Cathode
Current for
Regulation
IKA(MIN)
VKA=VREF
-
0.45
1.0
-
0.45
1.0
-
0.45
1.0
mA
Off -Stage
Cathode
Current
IKA(OFF)
VKA=36V, VREF=0
-
0.05
1.0
-
0.05
1.0
-
0.05
1.0
µA
Dynamic
Impedance
ZKA
VKA=VREF,
IKA=1 to 100mA ,f ≥1.0kHz
-
0.15
0.5
-
0.15
0.5
-
0.15
0.5
Ω
Reference
Input Current
IREF
-
-
Note1
TMIN = -25°C, TMAX = +85°C
3
FAN431/FAN431A/FAN431L
Test Circuits
FAN431
FAN431
Figure 1. Test Circuit for VKA=VREF
FAN431
Figure 3. Test Circuit for lKA(OFF)
4
Figure 2. Test Circuit for VKA≥VREF
FAN431/FAN431A/FAN431L
Typical Performance Characteristics
800
150
VKA = VREF
o
VKA = VREF
TA = 25 C
o
TA = 25 C
600
IKA, CATHODE CURRENT (uA)
IK, Cathode Current (mA)
100
50
0
IKA(MIN)
400
200
0
-50
-200
-100
-2
-1
0
1
2
-1
3
0
1
2
3
VKA, CATHODE VOLTAGE (V)
VKA, Cathode Voltage (V)
Figure 4. Cathode Current vs. Cathode Voltage
Figure 5. Cathode Current vs. Cathode Voltage
3.5
0.100
Iref, Reference Input Current (uA)
Ioff, Off-State Cathode Current (uA)
3.0
0.075
0.050
0.025
0.000
-50
-25
0
25
50
75
100
2.5
2.0
1.5
1.0
0.5
0.0
-50
125
-25
0
o
25
50
75
100
125
o
TA, Ambient Temperature ( C)
TA, Ambient Temperature ( C)
Figure 6. OFF-State Cathode Current vs.
Ambient Temperature
Figure7. Reference Input Current vs.
Ambient Temperature
6
60
o
TA = 25 C
IKA = 10mA
50
o
TA=25 C
5
INPUT
4
Voltage Swing (V)
Open Loop Voltage Gain (dB)
40
30
20
3
OUTPUT
2
10
1
0
0
-10
1k
10k
100k
1M
10M
Frequency (Hz)
Figure 8. Small Signal Voltage Amplification vs. Frequency
0
4
8
12
16
20
Time (us)
Figure 9. Pulse Response
5
FAN431/FAN431A/FAN431L
Typical Performance Characteristics (Continued)
5
140
A VKA = Vref
B VKA = 5.0 V @ IK = 10mA
120
4
o
A
100
Current(mA)
IK, CATHODE CURRENT(mA)
TA = 25 C
80
60
1
B
0
100p
1n
10n
1!
100n
10!
CL, LOAD CAPACITANCE
5
4
3
2
1
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Anode-Ref. Voltage(V)
Figure 10. Stability Boundary Conditions
Current(mA)
2
40
20
1.6
1.8
2.0
Ref.-Cathode Voltage(V)
Figure 12. Reference-Cathode Diode Curve
6
3
Figure 11. Anode-Reference Diode Curve
FAN431/FAN431A/FAN431L
Typical Application
R
V O = V ref  1 + ------1-

R 2
R
V O =  1 + ------1- V ref

R 
2
R
V O =  1 + ------1- V ref

R 
2
LM7805/MC7805
FAN431
FAN431
Figure 13. Shunt Regulator
-
FAN431
Figure 14. Output Control for
Figure 15. High Current Shunt Regulator
Three-Termianl Fixed Regulator
FAN431
Figure 16. Current Limit or Current Source
FAN431
Figure 17. Constant-Current Sink
7
FAN431/FAN431A/FAN431L
Mechanical Dimensions
Package
Dimensions in millimeters
TO-92
+0.25
4.58 ±0.20
4.58 –0.15
14.47 ±0.40
0.46 ±0.10
1.27TYP
[1.27 ±0.20]
1.27TYP
[1.27 ±0.20]
8
(0.25)
+0.10
0.38 –0.05
1.02 ±0.10
3.86MAX
3.60 ±0.20
(R2.29)
+0.10
0.38 –0.05
FAN431/FAN431A/FAN431L
Ordering Information
Product Number
Output Voltage Tolerance
FAN431ZXA
2%
FAN431AZXA
1%
FAN431LZXA
0.5%
Package
Operating Temperature
TO-92
-25 ~ +85°C
9
FAN431/FAN431A/FAN431L
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.
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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.
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