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PDF TFTL431 Data sheet ( Hoja de datos )
| Número de pieza | TFTL431 | |
| Descripción | PROGRAMMABLE PRECISION REFERENCES | |
| Fabricantes | Tuofeng Semiconductor | |
| Logotipo |  |
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Shenzhen Tuofeng Semiconductor Technology Co., Ltd
TFTL431
PROGRAMMABLE PRECISION REFERENCES
The TL431 is three-terminal adjustable shunt regulator
with specified termal stability.
The output voltage may be set to any value between
V REF(Approx. 2.5V) and 36V with two external resistors.
This device has a typical output inpedance of 0.2Ω.
Active output circuitry provides a very sharp turn-on
characteristic, making this device excellent
replacement for zener diodes in many application.
TO-92 (TOP VIEW)
3.
2.
1.
SOT-23
2.
SOT-89
FEATURES
1. 3.
1. 2. 3.
1. REF 2. ANODE 3. CATHODE
● Equivalent Full Range Temperature Coefficient 50PPM/℃
● Temperature Compensated For Operation Over
Full Rate Operating Temperature Range
● Adjustable Output Voltage
● Fast Turn-on Response
● Sink Current Capability 1㎃ to 100㎃
● Low (0.2Ω Typ.) Dynamic Output Impedance
● Low Output Noise
FUNCTION BLOCK DIAGRAM
BLOCK DIAGRAM
REFERENCE
2.495VREF
ANODE
CATHODE
CATHODE(K)
REFERENCE(R)
ANODE(A)
Oct. 2003 - Rev 03
1
1 page  
Shenzhen Tuofeng Semiconductor Technology Co., Ltd
TF TL431
TYPICAL PERFORMANCE CHARACTERISTICS
2600
2580
2560
2540
REFERENCE VOLTAGE vs
FREE-AIR TEMPERATURE†
VREF=2500㎷‡
2520
2500
VREF=25㎷‡
2480
2460
2440
VREF=2440㎷‡
2420
2400
-75 -50 -25
0
25 50 75 100 125
TA-FREE-AIR TEMPERATURE-℃
† Data is applicable only within the recommended operating free-air
temperature ranges of the various devices.
‡ Data is for devices having the indicated value of RVEFat IKA=10㎷,
TA=25℃
Figure 4.
CATHODE CURRENT vs
CATHODE VOLTAGE
150
125
VKA=VREF
TA=25℃
100
75
50
25
0
-25
-50
-75
-100
-2
-1
0
12
VKA-CATHODE VOLTAGE-V
Figure 6.
3
5
R1=10㏀
R2=∞
IKA=10㎃
4
REFERENCE CURRENT vs
FREE-AIR TEMPERATURE †
3
2
1
0
-75 -50 -25
0
25 50 75 100 125
TA-FREE-AIR TEMPERATURE-℃
† Data is applicable only within the recommended operating free-air
temperature ranges of the various devices.
800
VKA=VERF
TA=25℃
600
400
Figure 5.
CATHODE CURRENT vs
CATHODE VOLTAGE
IMIN
200
0
-200
-1
01
2
VKA-CATHODE VOLTAGE-V
Figure 7.
3
5
5 Page 
Shenzhen Tuofeng Semiconductor Technology Co., Ltd
TF TL431
APPLICATION INFORMATION
VI(BATT)
IN
8.2㏀
OUT
LM317
Adjust
VO ~~ 5V, 1.5A
243Ω
0.1%
TL431
243Ω
0.1%
Figure 21. Precision 5-V 1.5A Regulator
VI(BATT)
RB
(SEE NOTE A)
TL431
VO ~~ 5V
27.4㏁
0.1%
27.4㏁
0.1%
NOTE A : RB Should provide cathode current≥1㎃ to the TL431.
Figure 22. Efficient 5-V Precision Regulator
12V
TL431
6.8㏁
5V 10㏁
10㏁
0.1%
10㏁
0.1%
X
NOT
USED
-
+
TL598
FEED BACK
Figure 23. PWM Converter With Reference
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet TFTL431.PDF ] | |
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