Absolute Maximum Ratings @TA= 25℃ unless otherwise noted Parameter
Cathode Voltage Continuous Cathode Current Reference Current SOT23 Power Dissipation TA = 25℃ SOP8 SOT89 TO92 Operating Temperature Range TOPR PD
(for TL431-TA ）
Figure 1. Cathode Current Vs Cathode Voltage
Figure 2 . Cathode Current Vs Cathode Voltage
Figure 3. Reference Voltage Vs Junction Temperature
TL431
Pin Configurations Pin Port ① ② ③ ④⑤ ⑥⑦ ⑧ Functional Block Diagram SOT23
Reference Cathode Anode ----
SOP8
Cathode Anode Anode NC Anode Reference
SOT89
Symbol
VKA IKA IREF
Ratings
36 150 10 350 800 1000 770 -40 to +125
Unit
V mA mA
mW
℃
2/5
ｈｔｔｐ：／／ｗｗｗ．ｊｕｎｙｉ－ｉｃ．ｃｏｍ
TL431
Junction Temperature Storage Temperature Range Lead Temperature (Soldering) 10 seconds TJ TSTG TLEAD 150 -65 to +150 260 ℃ ℃ ℃
Applications General Description
TL431 series is a low-voltage three-terminal adjustable shunt regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage can be set to any value between VREF to 36V with two external resistors (see application circuit). This device has a typical output impedance of 0.2Ω. Active output circuitry provides a very • Linear Regulators • Adjustable Supplies • Switching Power Supplies • Battery Operated Computers • Instrumentation • Computer Disk Drives
Unit
VREF=2.50V
1%
VREF
1
VKA = VREF IKA = 10mA
2.475
2.50
2.525
V
2% Deviation of reference voltage over full temperature range Ratio of change in reference voltage to the change in cathode voltage Reference current Deviation of reference current over full temperature range Minimum cathode current for regulation Off-state cathode current Dynamic impedance * Full range-40℃ to 125℃ VKA = VREF IKA = 10mA TA = full range* IKA = 10mA ΔVKA = 10V-VREF IKA = 10mA,R1= 10K, R2 = ∞ IKA = 10mA,R1= 10K, R2 = ∞,TA = full range VKA = VREF VKA = 18V, VREF = 0 IKA = 1mA to 100mA, VKA = VREF f ≤ 1kHz
5/5
ｈｔｔｐ：／／ｗｗｗ．ｊｕｎｙｉ－ｉｃ．ｃｏｍ
TL431 Programmable Precision Shunt Regulator
Features
• Low voltage operation • Adjustable output voltage V0 = VREF to 36V • Wide operating current range 120μA to 100mA • Low dynamic output impedance 0.2Ω(TYP).. • ESD protected. sharp turn on characteristic, making this device excellent replacement for Zener diodes in many applications. TL431 series is characterized for operation from -40℃ to 125℃ and the package options (SOT23, SOT89, SOP8 and TO92) provide flexibility for designers.
Package Information
2.90 0.1 0.40 0.1
0.115 0.035
③
2.40 0.15 1.30 0.1
①
②
0.950TYP 1.90 0.1 1.05 0.15
⑧
⑦
⑥
⑤
①
②
③
④
Units:mm
①
②
③ ① ② ③
Units:mm
1/5
ｈｔｔｐ：／／ｗｗｗ．ｊｕｎｙｉ－ｉｃ．ｃｏｍ
Figure 4. Reference Input Current Vs Junction Temperature
4/5
ｈｔｔｐ：／／ｗｗｗ．ｊｕｎｙｉ－ｉｃ．ｃｏｍ
TL431
DISCLAIMER
YUKUN SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. YUKUN DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENCE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
Reference Anode Cathode ----
TO92
Reference Anode Cathode ----
Block Diagram
Symbol Diagram
Ordering Information
TL431 : TO92; SM: SOT89; SI: SOT23; SQ: SOP8 Indicate The Product Number
Electrical Characteristics @TA= 25℃ unless otherwise noted Parameter
0.4% Reference voltage
Symbol
Test Circuits
Test Conditions
TL431 Min
2.49
Typ
2.50
Max
2.51
Test Circuit 2: VKA ＞ VREF
Test Circuit3: off State Current
3/5
ｈｔｔｐ：／／ｗｗｗ．ｊｕｎｙｉ－ｉｃ．ｃｏｍ
TL431
Typical Application Circuit
Typical Performance Characteristics
2.450
2.50
2.550
VI(DEV) ΔVREF ΔVKA IREF
1
--
4
25
mV
2
--
-1.4
-2.7
mV/V
2
--
2
4
µA
II(DEV) IMIN IOFF RZ
2 1 3 1
-----
0.4 0.2 0.1 0.2
1.2 1 1 0.5
µA mA µA Ω
Test Circuits
Test Circuit 1: VKA = VREF