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FAN431/FAN431A/FAN431L
Programmable Shunt Regulator
Features
• • • • 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
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.
TO-92
1
1. Ref 2. Anode 3. Cathode
Internal Block Diagram
REFERENCE
CATHODE
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 Cathode Voltage Cathode current Range (Continuous) Reference Input Current Range Thermal Resistance Junction-Air (Note1,2) Z Suffix Package Power Dissipation (Note3,4) Z Suffix Package Junction Temperature Operating Temperature Range Storage Temperature Range
Note: 1. Thermal resistance test board
Symbol VKA IKA IREF RθJA PD TJ TOPR TSTG
Value 37 -100 ~ +150 -0.05 ~ +10 132 940 150 -25 ~ +85 -65 ~ +150
Unit V mA mA °C/W mW °C °C °C
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 Cathode Voltage Cathode Current Symbol VKA IKA Min. VREF 1.0 Typ. Max. 36 100 Unit V mA
2
FAN431/FAN431A/FAN431L
Electrical Characteristics
(TA = +25°C, unless otherwise specified) Parameter
Reference Input Voltage Deviation of Reference Input Voltage OverTemperature Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off -Stage Cathode Current Dynamic Impedance
Symbol
VREF
Conditions
VKA=VREF, IKA=10mA
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
Unit
V
∆VREF/ ∆T
VKA=VREF, IKA=10mA TMIN≤TA≤TMAX
-
4.5
17
-
4.5
17
-
4.5
17
mV
∆VREF/ ∆VKA
IKA =10mA
∆VKA=10VVREF
-
-1.0
-2.7
-
-1.0
-2.7
-
-1.0
-2.7 mV/V
∆VKA=36V10V
IREF IKA=10mA, R1=10kΩ,R2=∞
-
-0.5
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
-
1.5
4
-
1.5
4
-
1.5
4
µA
IKA=10mA, R1=10kΩ,R2=∞ ∆IREF/∆T TA =Full Range
-
0.4
1.2
-
0.4
1.2
-
0.4
1.2
µA
IKA(MIN)
VKA=VREF
-
0.45
1.0
-
0.45
1.0
-
0.45
1.0
mA
IKA(OFF)
VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA ,f ≥1.0kHz
-
0.05
1.0
-
0.05
1.0
-
0.05
1.0
µA
Ω
ZKA
-
0.15
0.5
-
0.15
0.5
-
0.15
0.5
Note1 TMIN = -25°C, TMAX = +85°C
3
FAN431/FAN431A/FAN431L
Test Circuits
FAN431 FAN431
Figure 1. Test Circuit for VKA=VREF
Figure 2. Test Circuit for VKA≥VREF
FAN431
Figure 3. Test Circuit for lKA(OFF)
4
FAN431/FAN431A/FAN431L
Typical Performance Characteristics
800
150
VKA = VREF TA = 25 C
o
VKA = VREF TA = 25 C
o
600
100
IKA, CATHODE CURRENT (uA)
IK, Cathode Current (mA)
50
400
IKA(MIN)
0
200
-50
0
-100 -2 -1 0 1 2 3
VKA, Cathode Voltage (V)
-200 -1 0 1
VKA, CATHODE VOLTAGE (V)
2
3
Figure 4. Cathode Current vs. Cathode Voltage
Figure 5. Cathode Current vs. Cathode Voltage
0.100
3.5
3.0
Ioff, Off-State Cathode Current (uA)
0.075
Iref, Reference Input Current (uA)
2.5
2.0
0.050
1.5
0.025
1.0
0.5
0.000 -50
-25
0
25
50
75
o
100
125
0.0 -50
-25
0
25
50
75
o
100
125
TA, Ambient Temperature ( C)
TA, Ambient Temperature ( C)
Figure 6. OFF-State Cathode Current vs. Ambient Temperature
Figure7. Reference Input Current vs. Ambient Temperature
60
TA = 25 C IKA = 10mA
o
6
TA=25 C
o
50
5
INPUT
40
Open Loop Voltage Gain (dB)
4
30
Voltage Swing (V)
3
OUTPUT
20
2
10
1
0
-10 1k 10k 100k
Frequency (Hz)
0
1M
10M
0
4
8
Time (us)
12
16
20
Figure 8. Small Signal Voltage Amplification vs. Frequency
Figure 9. Pulse Response
5
FAN431/FAN431A/FAN431L
Typical Performance Characteristics (Continued)
5
140 A VKA = Vref B VKA = 5.0 V @ IK = 10mA TA = 25 C
o
4
120
IK, CATHODE CURRENT(mA)
100
A
80
C urrent(mA)
B
1n 10n 100n 1! 10!
3
60
2
40
1
20
0 100p
CL, LOAD CAPACITANCE
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
5
Figure 11. Anode-Reference Diode Curve
4
Current(mA)
3
2
1
0 0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Ref.-Cathode Voltage(V)
Figure 12. Reference-Cathode Diode Curve
6
FAN431/FAN431A/FAN431L
Typical Application
R1 V O = 1 + ------ V ref R
2
R1 V O = V ref 1 + ------ R 2
R1 V O = 1 + ------ V ref R
2
LM7805/MC7805
FAN431
FAN431
FAN431
Figure 13. Shunt Regulator
-
Figure 14. Output Control for Figure 15. High Current Shunt Regulator Three-Termianl Fixed Regulator
FAN431
FAN431
Figure 16. Current Limit or Current Source
Figure 17. Constant-Current Sink
7
FAN431/FAN431A/FAN431L
Mechanical Dimensions
Package Dimensions in millimeters
TO-92
4.58 –0.15
+0.25
14.47 ±0.40
0.46 ±0.10
4.58 ±0.20
1.27TYP [1.27 ±0.20] 3.60 ±0.20
1.27TYP [1.27 ±0.20]
0.38 –0.05
+0.10
3.86MAX
1.02 ±0.10
0.38 –0.05
+0.10
(R2.29)
8
(0.25)
FAN431/FAN431A/FAN431L
Ordering Information
Product Number FAN431ZXA FAN431AZXA FAN431LZXA Output Voltage Tolerance 2% 1% 0.5% TO-92 -25 ~ +85°C Package Operating Temperature
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. 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.
www.fairchildsemi.com 8/4/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation
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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