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TL431/TL431A Programmable Shunt Regulator

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TL431/TL431A Programmable Shunt Regulator www.fairchildsemi.com TL431/TL431A Programmable Shunt Regulator Features Description • Programmable Output Voltage to 36 Volts The TL431/TL431Aare three-terminal adjustable regulator • Low Dynamic Output Impedance 0.20 Typical series with a guaranteed thermal stability over applicable • Sink Current Capability of 1.0 to 100mA temperature ranges. The output voltage may be set to any • Equivalent Full-Range Temperature Coefficient of value between VREF (approximately 2.5 volts) and 36 volts 50ppm/°C Typical with two external resistors These devices have a typical • Temperature Compensated For Operation Over Full Rated dynamic output impedance of 0.2W Active output circuitry Operating Temperature Range provides a very sharp turn-on characteristic, making these • Low Output Noise Voltage devices excel lent replacement for zener diodes in many • Fast Turn-on Response applications. TO-92 1 1. Ref 2. Anode 3. Cathode 8-DIP 1 1.Cathode 2.3.4.5.7.NC 6.Anode 8.Ref 8-SOP 1 1. Cathode 2. 3. 6. 7. Anode 8. Ref 4. 5. NC Rev. 1.0.3 ©2003 Fairchild Semiconductor Corporation TL431/TL431A Internal Block Diagram 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 Power Dissipation D, LP Suffix Package PD 770 mW P Suffix Package 1000 mW Operating Temperature Range TOPR -25 ~ +85 °C Junction Temperature TJ 150 °C Storage Temperature Range TSTG -65 ~ +150 °C Recommended Operating Conditions Parameter Symbol Min Typ Max Unit Cathode Voltage VKA VREF -36V Cathode Current IKA 1.0 - 100 mA 2 TL431/TL431A Electrical Characteristics (TA = +25°C, unless otherwise specified) TL431 TL431A Parameter Symbol Conditions Unit Min. Typ. Max. Min. Typ. Max. Reference Input Voltage VREF VKA=VREF, IKA=10mA 2.440 2.495 2.550 2.470 2.495 2.520 V Deviation of Reference Input Voltage Over- ∆V / V =V , I =10mA - - REF KA REF KA 4.5 17 4.5 17 mV Temperature (Note 1) ∆T TMIN≤TA≤TMAX Ratio of Change in ∆V / ∆V =10V- REF KA - - 10 -2.7 - -1.0 -2.7 Reference Input Voltage ∆VKA I VREF KA mV/V to the Change in =10mA ∆V =36V- KA - -0.5 -2.0 - -0.5 -2.0 Cathode Voltage 10V IKA=10mA, Reference Input Current IREF -1.54 -1.54µA R1=10KΩ,R2=∞ Deviation of Reference IKA=10mA, Input Current Over Full R1=10KΩ,R2=∞ - - ∆IREF/∆T 0.4 1.2 0.4 1.2 µA Temperature Range TA =Full Range Minimum Cathode Cur- I V =V - 0.45 1.0 - 0.45 1.0 mA rent for Regulation KA(MIN) KA REF Off - Stage Cathode VKA=36V, IKA(OFF) - 0.05 1.0 - 0.05 1.0 µA Current VREF=0 V =V , Dynamic Impedance KA REF Z I =1 to 100mA - 0.15 0.5 - 0.15 0.5 Ω (Note 2) KA KA f ≥1.0KHz •TMIN= -25 °C, TMAX= +85 °C 3 TL431/TL431A Test Circuits TL431/A TL431/A Figure 1. Test Circuit for VKA=VREF Figure 2. Test Circuit for VKA≥VREF TL431/A Figure 3. Test Circuit for lKA(OFF) 4 TL431/TL431A Typical Perfomance Characteristics Figure 1. Cathode Current vs. Cathode Voltage Figure 2. Cathode Current vs. Cathode Voltage Figure 3. Change In Reference Input Voltage vs. Figure 4. Dynamic Impedance Frequency Cathode Voltage Figure 5. Small Signal Voltage Amplification vs. Frequency Figure 6. Pulse Response 5 TL431/TL431A Typical Application R R1 R V = 1 + ------1- V V = V 1 + ------- V = 1 + ------1- V O ref O refR O ref R2 2 R2 MC7805/LM7805 TL431/A TL431/A TL431/A Figure 10. Shunt Regulator Figure 11. Output Control for Three- Figure 12. High Current Shunt Regula- Termianl Fixed Regulator tor TL431/A TL431/A Figure 13. Current Limit or Current Source Figure 14. Constant-Current Sink 6 TL431/TL431A Mechanical Dimensions Package TO-92 +0.25 4.58 –0.15 0.20 ± 4.58 0.46 ±0.10 0.40 ± 14.47 +0.10 1.27TYP 1.27TYP 0.38 –0.05 [1.27 ±0.20] [1.27 ±0.20] 3.60 ±0.20 3.86MAX (0.25) (R2.29) +0.10 –0.05 0.10 ± 0.38 1.02 7 TL431/TL431A Mechanical Dimensions (Continued) Package 8-DIP 6.40 ±0.20 0.252 ±0.008 0.79 0.031 0.10 () 0.10 ± 0.004 0.004 ± ± ± 0.46 #1 #8 1.524 0.060 0.018 0.008 0.20 MAX ± ± 9.20 9.60 0.378 0.362 #4 #5 2.54 0.100 5.08 3.30 ±0.30 MAX 0.200 0.130 ±0.012 7.62 0.300 3.40 ±0.20 0.33 MIN 0.134 ±0.008 0.013 +0.10 0.25 –0.05 +0.004 0.010 –0.002 ° 0~15 8 TL431/TL431A Mechanical Dimensions (Continued) Package 8-SOP 0.1~0.25 MIN 0.004~0.001 1.55 ±0.20 0.061 ±0.008 0.56 0.022 () #1 #8 0.008 0.20 MAX ± ± 4.92 5.13 0.202 0.194 0.004 #5 0.10 #4 ± ± 0.41 0.016 ± 6.00 0.30 1.80 ± MAX 1.27 0.236 0.012 0.071 0.050 0.006 0.15 + -0.002 + -0.05 0.004 ± 0.10 3.95 0.20 0.156 ±0.008 MAX0.10 MAX0.004 ° 5.72 0.225 0~8 0.50 ±0.20 0.020 ±0.008 9 TL431/TL431A Ordering Information Product Number Output Voltage Tolerance Package Operating Temperature TL431ACLP TO-92 1% TL431ACD 8-SOP TL431CLP TO-92 -25 ~ + 85oC TL431CP2% 8-DIP TL431CD 8-SOP 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 2. A critical component in any component of a life support which, (a) are intended for surgical implant into the body, device or system whose failure to perform can be or (b) support or sustain life, and (c) whose failure to reasonably expected to cause the failure of the life support perform when properly used in accordance with device or system, or to affect its safety or effectiveness. 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 19-2562; Rev 0; 10/02 76V, High-Side, Current-Sense Amplifiers with Voltage Output General Description Features MAX4080/MAX4081 The MAX4080/MAX4081 are high-side, current-sense o Wide 4.5V to 76V Input Common-Mode Range amplifiers with an input voltage range that extends from o 4.5V to 76V making them ideal for telecom, automotive, Bidirectional or Unidirectional ISENSE backplane, and other systems where high-voltage cur- o Low-Cost, Compact, Current-Sense Solution rent monitoring is critical. The MAX4080 is designed for unidirectional current-sense applications and the o Three Gain Versions Available MAX4081 allows bidirectional current sensing. The 5V/V (MAX4080F/MAX4081F) MAX4081 single output pin continuously monitors the 20V/V (MAX4080T/MAX4081T) transition from charge to discharge and avoids the 60V/V (MAX4080S/MAX4081S) need for a separate polarity output. The MAX4081 o ±0.1% Full-Scale Accuracy requires an external reference to set the zero-current output level (VSENSE = 0V). The charging current is rep- o Low 100µV Input Offset Voltage resented by an output voltage from V to V , while REF CC o Independent Operating Supply Voltage discharge current is given from VREF to GND. o For maximum versatility, the 76V input voltage range 75µA Supply Current (MAX4080) applies independently to both supply voltage (VCC) o Reference Input for Bidirectional OUT (MAX4081) and common-mode input voltage (VRS+). High-side current monitoring does not interfere with the ground o Available in a Space-Saving 8-Pin µMAX Package path of the load being measured, making the Ordering Information MAX4080/MAX4081 particularly useful in a wide range of high-voltage systems. PART TEMP RANGE PIN-PACKAGE The combination of three gain versions (5V/V, 20V/V, MAX4080FAUA -40°C to +125°C 8 µMAX 60V/V = F, T, S suffix) and a user-selectable, external sense resistor sets the full-scale current reading and its MAX4080FASA -40°C to +125°C 8 SO proportional output voltage. The MAX4080/MAX4081 MAX4080TAUA -40°C to +125°C 8 µMAX offer a high level of integration, resulting in a simple, MAX4080TASA -40°C to +125°C 8 SO accurate, and compact current-sense solution. MAX4080SAUA -40°C to +125°C 8 µMAX The MAX4080/MAX4081 operate from a 4.5V to 76V sin- MAX4080SASA -40°C to +125°C 8 SO gle supply and draw only 75µA of supply current. These ° ° devices are specified over the automotive operating MAX4081FAUA -40 C to +125 C 8 µMAX temperature range (-40°C to +125°C) and are available MAX4081FASA -40°C to +125°C 8 SO in a space-saving 8-pin µMAX or SO package.
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