AIC431/TL431A/TL431. Adjustable Precision Shunt Regulators FEATURES DESCRIPTION TYPICAL APPLICATION CIRCUIT. Precision Regulator

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1 /TL431A/TL431 Adjustable Precision Shunt Regulators FEATURES Unconditionally Stable. Precision Reference Voltage. :2.495V ±0.5% TL431A :2.495V ±1.0% TL431 :2.495V ±1.6% Sink urrent apability: 200mA. Minimum athode urrent for Regulation: 250µA. Equivalent Full-Range Temperature oefficient: 50 ppm/. Fast Turn-On Response. Low Dynamic Output Impedance: 0.08Ω. Adjustable Output Voltage. Low Output Noise. Space Saving SOT-89, SOT-23, TO-92 and SO8 packages. TYPIAL APPLIATION IRUIT VIN VOUT DESRIPTION The /TL431A/TL431 are 3-terminal adjustable precision shunt regulators with guaranteed temperature stability over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 2.495V (V REF ) up to 30V merely by selecting two external resistors that act as a voltage divider network. These devices have a typical output impedance of 0.08Ω. Active output circuitry provides a very sharp turn-on characteristics, making these devices excellent improved replacements for zener diodes in many applications. The precise ±0.5% reference voltage tolerance of the makes it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems associated with it. R2 V OUT =(1/R2)V REF Precision Regulator Analog Integrations orporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, RO DS May 31, 01 TEL: FAX:

2 /TL431A/TL431 ORDERING INFORMATION X TL431A X TL431 X PAKAGING TYPE S: SMALL OUTLINE U: SOT-23 X: SOT-89 Z: TO-92 ORDER NUMBER S TL431AS TL431S (SO-8) PIN ONFIGURATION TOP VIEW ATHOD 1 8 REF ANODE ANODE N ANODE ANODE N UN TL431AUN TL431UN (SOT-23) FRONT VIEW 1: ATHODE 2: VREF 3: ANODE US TL431AUS TL431US (SOT-23) FRONT VIEW 1: VREF 2: ATHODE 3: ANODE X TL431AX TL431X (SOT-89) FRONT VIEW 1: VREF 2: ANODE 3: ATHODE Z TL431AZ TL431Z (TO-92) FRONT VIEW 1: VREF 2: ANODE 3: ATHODE ABSOLUTE MAXIMUM RATINGS athode Voltage V ontinuous athode urrent mA ~ 250mA Reference Input urrent Range mA Operating Temperature Range ~ 85 Lead Temperature Storage Temperature ~ 150 Power Dissipation (Notes 1, 2) SOT-89 Package W TO-92 Package W Note 1: T J, max = 150. Note 2: Ratings apply to ambient temperature at 25. 2

3 /TL431A/TL431 TEST IRUITS IN IN IL I L V Z I REF VZ I REF IZ VREF I Z R2 VREF Note: V Z =V REF (1/R2)I REF x Fig. 1 Test ircuit for V Z =V REF Fig. 2 Test circuit for V Z >V REF IN VZ IZ(OFF) Fig. 3 Test circuit for off-state urrent ELETRIAL HARATERISTIS (Ta=25, unless otherwise specified.) PARAMETER TEST ONDITIONS SYMBOL MIN. TYP. MAX. UNIT Reference Voltage Deviation of Reference Input Voltage Over Temperature (Note 3) Ratio of the hange in Reference Voltage to the hange in athode voltage Reference Input urrent V Z =V REF, IL =10mA (Fig. 1) TL431A V REF TL V Z = V REF, I L =10mA, Ta = 0 ~ 85 (Fig. 1) V DEV mv I Z =10mA V Z =10V-V REF mv/v (Fig. 2) =10KΩ, R2=, I L =10mA (Fig. 2) V Z =30V-10V V REF V Z mv/v I REF µa V 3

4 /TL431A/TL431 Deviation of Reference Input urrent over Temperature =10KΩ, R2=, I L =10mA Ta =-20 ~ 85 (Fig. 2) αi REF µa 4

5 /TL431A/TL431 ELETRIAL HARATERISTIS (ontinued) PARAMETER TEST ONDITIONS SYMBOL MIN. TYP. MAX. UNIT Minimum athode current for Regulation V Z =V REF (Fig. 1) I Z(MIN) ma Off-State urrent V Z =20V, V REF =0V (Fig. 3) I Z(OFF) µa Dynamic Output Impedance (Note 4) V Z =V REF Frequency= 0Hz (Fig. 1) R Z Ω V MAX V MIN T 1 VDEV = VMAX-VMIN TEMPERATURE Note 3. Deviation of reference input voltage, V DEV, is defined as the maximum variation of the reference input voltage over the full temperature range. The average temperature coefficient of the reference input voltage, αv REF is defined as: VMAX- VMIN 6 VDEV 6 ± 10 ± 10 ppm VREF(at 25 ) VREF(at25 ) VREF = = T2 T1 T2 T1 T 2 Where: T 2 T 1 =full temperature change. αv REF can be positive or negative depending on whether the slope is positive or negative. Example: V DEV = 9.0mV, V REF = 2495mV, T 2 T 1 = 70, slope is negative. 9.0mV mV αvref = = 50ppm/ 70 Note 4. The dynamic output impedance, R z, is defined as: VZ R Z = IZ When the device is programmed with two external resistors, and R2, (see Fig. 2), the dynamic output impedance of the overall circuit, is defined as: Vz r z = Rz[ 1 ] Iz R2 TYPIAL PERFORMANE HARATERISTIS athode urrent (µa) athode urrent vs athode Voltage V Z =V REF T A =25 I Z(MIN) athode Voltage (V) Reference Voltage (V) Reference Voltage vs Temperature V Z =V REF I Z =10mA Temperature ( ) V REF=2.535V V REF=2.495V V REF=2.455V 5

6 /TL431A/TL431 TYPIAL PERFORMANE HARATERISTIS (ontinued) Reference Input urrent (µa) Reference Input urrent vs Temperature Temperature ( ) =10KΩ R2= I Z =10mA Dynamic Impedance (Ω) Dynamic Impedance vs Temperature V Z=V REF I Z=1mA to100ma F <1KHz Temperature ( ) hange in Reference Voltage (mv) hange in Reference Voltage vs athode Voltage IZ =10mA T A =25 Off-State athode urrent (µa) Off-State athode urrent vs Temperature VREF=0V V Z =30V athode Voltage (V) Temperature ( ) Small Signal Voltage Amplification vs Frequency 80 Small Signal Voltage Amplification I Z =10mA TA= k 10k 100k 1M 10M Av 47µF IN 10K R 250 V1 Output Frequency (Hz) Test ircuit For Frequency Response 6

7 /TL431A/TL431 TYPIAL PERFORMANE HARATERISTIS (ontinued) Pulse Response Input RB 220 OUTPUT Output Pulse Generator f=100khz RA 50 Test ircuit For Pulse Respnose 100 Stability Boundary onditions athode urrent (ma) V Z =V REF Stable Stable L R 150 VIN VZ 0 1E-4 1E Load apacitance (µf) The areas between the curves represent condition that may cause the device oscillate Test ircuit for Stability Boundary onditions Dynamic impedance vs. Frequency 10 Dynamic Impedance (Ω) Iz=10mA TA=25 A 50 R2 50 Output 3V GND 1K 10K 100K 1M Frequency (Hz) 7

8 /TL431A/TL431 SYMBOL ATHODE () BLOK DIAGRAM REF (R) REF (R) 2.495V - ATHODE () ANODE (A) ANODE (A) APPLIATION EXAMPLES A B R R2A R2B OFF ON LED on when Low Limit< < High Limit Low Limit V (1B/R2B) Delay=R x xln REF ( VIN VIN V High Limit V REF (1A/R2A) Fig. 4 Voltage Monitor REF ) Fig. 5Delay Timer I OUT R L I OUT R S I OUT =V REF / R L Fig. 6 urrent Limiter or urrent Source I OUT =V REF /R S Fig. 7 onstant-urrent Sink 8

9 /TL431A/TL431 APPLIATION EXAMPLES (ontinued) V OUT FUSE V OUT R2 R2 V OUT (1/R2) x V REF V LIMIT (1/R2) x V REF Fig 8. Higher-urrent Shunt Regulator Fig 9. row Bar A B Output ON when Low Limit <VIN < High Limit R2A R2B VBE Low Limit V REF ( 1 B/ R2B ) V BE High Limit V REF ( 1 A/ R2A ) Fig 10. Over-Voltage/Under-Voltage Protection ircuit 9

10 /TL431A/TL431 PHYSIAL DIMENSIONS 8 LEAD PLASTI SO (unit: mm) D SYMBOL MIN MAX A E H A B D e A A1 E e 1.27(TYP) H L B L SOT-23 (unit: mm) D SYMBOL MIN MAX L A A E H A b e θ D E A2 A A1 e 1.90 (TYP) H b L SOT-23 MARKING Part No. Marking Part No. Marking UN A1N US A1S TL431UN A2N TL431US A2S TL431AUN A3N TL431AUS A3S 10

11 /TL431A/TL431 PHYSIAL DIMENSIONS (ontinued) SOT-89 (unit: mm) D D1 A SYMBOL MIN MAX A B H E D D L e e1 B E e 1.50 (TYP.) e (TYP.) H SOT-89 MARKING L Part No. X TL431X TL431AX Marking A01B A02B A03B TO-92 (unit: mm) A L E SYMBOL MIN MAX A (TYP.) D e1 D E e (TYP.) L

12 This datasheet has been download from: Datasheets for electronics components.

CM1117 1A LOW DROPOUT VOLTAGE REGULATOR

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