TS431 Taiwan Semiconductor 2.495V Programmable Shunt Voltage Reference GENERAL DESCRIPTION FEATURES TS431 series integrated circuits are three-terminal ● Precision Reference Voltage programmable shunt regulator diodes. These monolithic TS431 –2.495V ±2% IC voltage references operate as a low temperature TS431A – 2.495V ±1% coefficient zener which is programmable from VREF to 36 TS431B – 2.495V ±0.5% volts with two external resistors. These devices exhibit a ● Equivalent Full Range Temp. Coefficient: wide operating current range of 1.0 to 100mA with a 50ppm/°C typical dynamic impedance of 0.22Ω. ● Programmable Output Voltage up to 36V The characteristics of these references make them ● Fast Turn-On Response excellent replacements for zener diodes in many ● Sink Current Capability of 1~100mA applications such as digital voltmeters, power supplies, ● Low Dynamic Output Impedance: 0.2Ω and op amp circuitry. The 2.5V reference makes it ● Low Output Noise convenient to obtain a stable reference from 5.0V logic APPLICATION supplies, and since The TS431 series operates as a ● SMPS shunt regulator, it can be used as either a positive or ● Lighting negative stage reference. ● Telecommunication ● Home appliance TO-92 Pin Definition: 1. Reference 2. Anode 3. Cathode SOT-23 Pin Definition: 1. Reference 2. Cathode 3. Anode SOP-8 Pin Definition 1. Cathode 2. Anode 3. Anode 4. N/C 5. N/C 6. Anode 7. Anode 8. Reference Notes: 1. Moisture sensitivity level: level 3. Per J-STD-020 (SOP-8) 2. Moisture sensitivity level: level 1. Per J-STD-020 (SOT-23) TYPICAL APPLICATIN CIRCUIT Document Number: DS_P0000235 1 Version: H15 TS431 Taiwan Semiconductor ABSOLUTE MAXIMUM RATINGS PARAMETER (Note 1) Cathode Voltage Continuous Cathode Current Range Reference Input Current Range SYMBOL LIMIT UNIT VKA 37 V IK -100 ~ +150 mA IREF -0.05 ~ +10 mA TO-92 0.625 SOT-23 Power Dissipation 0.30 PD SOP-8 W 0.50 Junction Temperature TJ +150 °C Operating Temperature Range TOPER 0 ~ +70 °C Storage Temperature Range TSTG -65 ~ +150 °C PARAMETER SYMBOL LIMIT UNIT Cathode Voltage VKA Ref ~ 36 V IK 1 ~ 100 mA RECOMMEND OPERATING CONDITION Continuous Cathode Current Range ELECTRICAL CHARACTERISTICS PARAMETER Reference voltage Deviation of reference input voltage Radio of change in Vref to change in cathode Voltage Reference Input current Deviation of reference input current, over temp. CONDITIONS SYMBOL TS431A VREF TS431B Dynamic Output Impedance Minimum operating cathode current 2.470 2.483 TYP 2.495 MAX 2.520 2.507 UNIT V VKA = VREF, IK =10mA Ta= full range ∆ VREF -- 3 17 IKA =10mA, VKA = 10V to VREF VKA = 36V to 10V ∆VREF /∆VKA -- -1.4 -2.7 -- -1.0 -2.0 IREF -- 0.7 4.0 uA ∆IREF -- 0.4 1.2 uA -- -- 1.0 -- -- 30 | ZKA | -- 0.22 0.5 Ω IKA (min) -- 0.4 0.6 mA R1=10KΩ, R2= ∞ , IKA =10mA Ta= full range R1=10KΩ, R2= ∞ , IKA =10mA Ta= full range VREF =0V , VKA =36V Off-state Cathode Current MIN VREF =0V , VKA =36V TJ=-25°C~125°C (Value is defined by design) IKA (off) f<1KHz, VKA = VREF IKA =1mA to 100mA VKA = VREF mV mV/V uA Note : 1. Voltage values are with respect to the anode terminal unless otherwise noted. Document Number: DS_P0000235 2 Version: H15 TS431 Taiwan Semiconductor ORDERING INFORMATION PART NO. PACKAGE PACKING TS431ACT B0G TO-92 1,000pcs / Bulk TS431BCT B0G TO-92 1,000pcs / Bulk TS431ACT A3G TO-92 2,000pcs / Ammo TS431BCT A3G TO-92 2,000pcs / Ammo TS431ACX RFG SOT-23 3,000pcs / 7” Reel TS431BCX RFG SOT-23 3,000pcs / 7” Reel TS431ACS RLG SOP-8 2,500pcs / 13” Reel TS431BCS RLG SOP-8 2,500pcs / 13” Reel TS431CS RLG SOP-8 2,500pcs / 13” Reel Note: 1. Compliant to RoHS Directive 2011/65/EU and in accordance to WEEE 2002/96/EC. 2. Halogen-free according to IEC 61249-2-21 definition. BLOCK DIAGRAM * The deviation parameters ∆VREF and ∆IREF are defined as difference between the maximum value and minimum value obtained over the full operating ambient temperature range that applied. * The average temperature coefficient of the reference input voltage, αVREF is defined as: Where: T2-T1 = full temperature change. αVREF can be positive or negative depending on whether the slope is positive or negative. Example: Maximum VREF=2.496V at 30°C, minimum VREF =2.492V at 0°C, VREF =2.495V at 25°C, ΔT=70°C 6 αVREF | = [4mV / 2495mV] * 10 / 70°C ≈ 23ppm/°C Because minimum VREF occurs at the lower temperature, the coefficient is positive. * The dynamic impedance ZKA is defined as: | ZKA | = ΔVKA / ΔIKA * When the device operating with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of the circuit is given by: | ZKA | = Δv / Δi | ≈ ZKA | * ( 1 + R1 / R2) Document Number: DS_P0000235 3 Version: H15 TS431 Taiwan Semiconductor ADDITIONAL INFORMATION – STABILITY When The TS431/431A/431B is used as a shunt regulator, there are two options for selection of CL, are recommended for optional stability: A) No load capacitance across the device, decouple at the load. B) Large capacitance across the device, optional decoupling at the load. The reason for this is that TS431/431A/431B exhibits instability with capacitances in the range of 10nF to 1uF (approx.) at light cathode current up to 3mA (typ). The device is less stable the lower the cathode voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode current of 10mA (approx.) with a 0.1uF capacitor across it, it will oscillate transiently during start up as the cathode current passes through the instability region. Select a very low capacitance, or alternatively a high capacitance (10uF) will avoid this issue altogether. Since the user will probably wish to have local decoupling at the load anyway, the most cost effective method is to use no capacitance at all directly across the device. PCB trace/via resistance and inductance prevent the local load decoupling from causing the oscillation during the transient start up phase. Note: if the TS431/431A/431B is located right at the load, so the load decoupling capacitor is directly across it, then this capacitor will have to be ≤1nF or ≥10uF. APPLICATIONS EXAMPLES Figure 2. Output Control for Three Terminal Fixed Regulator Figure 1. Voltage Monitor Document Number: DS_P0000235 4 Version: H15 TS431 Taiwan Semiconductor APPLICATIONS EXAMPLES (CONTINUE) Figure 4. High Current Shunt Regulator Figure 3. Shunt Regulator Figure 6. Constant Current Source Figure 5. Series Pass Regulator Figure 8. SCR Crowbar Figure 7. TRIAC Crowbar Document Number: DS_P0000235 5 Version: H15 TS431 Taiwan Semiconductor APPLICATIONS EXAMPLES (CONTINUE) Vin <Vref >Vref Vout V+ ≈0.74V Figure 9. Single-Supply Comparator with Temperature-Compensated Threshold Figure 10. Constant Current Sink Figure 11. Delay Timer Document Number: DS_P0000235 6 Version: H15 TS431 Taiwan Semiconductor TYPICAL PERFORMANCE CHARACTERISTICS Test Circuit for Voltage Amplification Figure 12. Small-Signal Voltage Gain and Phase Shirt vs. Frequency Test Circuit for Reference Impedance Figure 13. Reference Impedance vs. Frequency Test Circuit for Pulse Response, Ik=1mA Figure 14. Pulse Response Document Number: DS_P0000235 7 Version: H15 TS431 Taiwan Semiconductor TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUE) The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial VKA and IKA conditions with CL=0. VBATT and CL then were Test Circuit for Curve B, C and D adjusted to determine the ranges of stability. Figure 15. Reference Impedance vs. Frequency Document Number: DS_P0000235 8 Version: H15 TS431 Taiwan Semiconductor CHARACTERISTICS CURVES (TC = 25°C unless otherwise noted) Figure 17. Reference Current vs. Temperature Figure 16. Reference Voltage vs. Temperature Figure 18. Cathode Current vs. Cathode Voltage Document Number: DS_P0000235 9 Version: H15 TS431 Taiwan Semiconductor PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) SOT-23 SUGGESTED PAD LAYOUT (Unit: Millimeters) MARKING DIAGRAM 1 = Device Code X = Tolerance Code (A = ±1%, B = ±0.5%, Blank = ±2%) Y = Year Code M = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr S =May T =Jun U =Jul V =Aug W =Sep X =Oct Y =Nov Z =Dec L = Lot Code Document Number: DS_P0000235 10 Version: H15 TS431 Taiwan Semiconductor PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) SOP-8 SUGGESTED PAD LAYOUT (Unit: Millimeters) MARKING DIAGRAM Y = Year Code M = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr S =May T =Jun U =Jul V =Aug W =Sep X =Oct Y =Nov Z =Dec L = Lot Code Document Number: DS_P0000235 11 Version: H15 TS431 Taiwan Semiconductor PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) TO-92 PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) TO-92 AMMO PACK MARKING DIAGRAM X = Tolerance Code (A = ±1%, B = ±0.5%, Blank = ±2%,) Y = Year Code M = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr S =May T =Jun U =Jul V =Aug W =Sep X =Oct Y =Nov Z =Dec L = Lot Code Document Number: DS_P0000235 12 Version: H15 TS431 Taiwan Semiconductor Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. Document Number: DS_P0000235 13 Version: H15