TS432 Adjustable Precision Shunt Regulator SOT-23 Pin Definition: 1. Reference 2. Cathode 3. Anode General Description TS432 series is a three-terminal adjustable shunt regulator with specified thermal stability. The output voltage may be set to any value between VREF (approximately 1.24V) and 18V with two external resistors. TS432 series has a typical output impedance of 0.05Ω. Active output circuitry provides a very sharp turn-on characteristic, making TS432 series excellent replacement for zener diode in many applications. Features ● ● ● ● ● ● ● ● ● Ordering Information Precision Reference Voltage TS432A – 1.24V±1% TS432B – 1.24V±0.5% Minimum Cathode Current for Regulation: 20µA(typ.) Equivalent Full Range Temp. Coefficient: 50ppm/ ºC Programmable Output Voltage up to 18V Fast Turn-On Response Sink Current Capability of 80µA to 100mA Low Dynamic Output Impedance: 0.05Ω Low Output Noise Halogen Free Available Part No. Applications ● ● ● ● ● ● Package Packing TS432xCX RF SOT-23 3kpcs / 7” Reel TS432xCX RFG SOT-23 3kpcs / 7” Reel Note: Where x denotes voltage tolerance A: ±1%, B: ±0.5% “G” denotes for Halogen free products Block Diagram Voltage Monitor Delay Timmer Constant –Current Source/Sink High-Current Shunt Regulator Crow Bar Over-Voltage / Under-Voltage Protection Absolute Maximum Ratings (TA=25oC unless otherwise noted) Parameter Symbol Limit Unit VKA 18 V IK 100 mA Reference Input Current Range IREF 3 mA Power Dissipation PD 0.35 W TJ +150 o C TOPER 0 ~ +70 o C -65 ~ +150 o C Cathode Voltage (Note 1) Continuous Cathode Current Range Junction Temperature Operation Temperature Range Storage Temperature Range TSTG Note 1: Voltage values are with respect to the anode terminal unless otherwise noted. 1/10 Version: D14 TS432 Adjustable Precision Shunt Regulator Recommended Operating Condition Parameter Symbol Limit Unit VKA IK 16 100 V mA (Note 1) Cathode Voltage Continuous Cathode Current Range Electrical Characteristics Parameter Reference voltage Symbol TS432A TS432B VREF Deviation of reference input voltage ∆VREF Radio of change in Vref to change in cathode Voltage ∆VREF/∆VKA Reference Input current Deviation of reference input current, over temp. Off-state Cathode Current Dynamic Output Impedance IREF ∆IREF IKA (off) |ZKA| Test Conditions VKA=VREF, IK=10mA (Figure 1) o TA=25 C Min 1.227 1.233 Typ 1.240 Max 1.252 1.246 Unit V VKA =VREF, IK=10mA TA= full range (Figure 1) -- 10 25 mV IKA=10mA, VKA = 16V to VREF (Figure 2) -- -1.0 -2.7 mV/V -- 0.25 0.5 µA -- 0.04 0.8 µA -- 0.125 0.5 µA -- 0.2 0.4 Ω R1=10KΩ, R2= ∞ , IKA=10mA TA= full range (Figure 2) R1=10KΩ, R2= ∞ , IKA=10mA TA= full range (Figure 2) VREF=0V (Figure 3), VKA=16V f<1KHz, VKA=VREF IKA=1mA to 100mA (Figure 1) Minimum Operating Cathode IKA(MIN) VKA=VREF (Figure 1) -20 80 µA Current * 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 VREF Min. or VREF Max occurs at the lower ambient o o temperature. Example: ∆VREF=7.2mV and the slope is positive, VREF=1.241V at 25 C, ΔT=125 C * The dynamic impedance ZKA is defined as: * 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: 2/10 Version: D14 TS432 Adjustable Precision Shunt Regulator Test Circuits Figure 1: VKA = VREF Figure 2: VKA > VREF Figure 3: Off-State Current Additional Information – Stability When TS432 series 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 TS432 series exhibits instability with capacitances in the range of 10nF to 1µF (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 0.1µF 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 (10µF) 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 TS432 series is located right at the load, so the load decoupling capacitor is directly across it, then this capacitor will have to be ≤1nF or ≥10µF. Applications Examples Figure 5: Output Control for Three Terminal Fixed Regulator Figure 4: Voltage Monitor 3/10 Version: D14 TS432 Adjustable Precision Shunt Regulator Applications Examples (Continue) Figure 6: Shunt Regulator Figure 7: High Current Shunt Regulator Figure 8: Series Pass Regulator Figure 9: Constant Current Source Figure 10: TRIAC Crowbar Figure 11: SCR Crowbar 4/10 Version: D14 TS432 Adjustable Precision Shunt Regulator Applications Examples (Continue) Vin <Vref >Vref Vout V+ ≈0.74V Figure 12: Single-Supply Comparator with TemperatureCompensated Threshold Figure 13: Constant Current Sink 5/10 Figure 14: Delay Timer Version: D14 TS432 Adjustable Precision Shunt Regulator Typical Performance Characteristics Test Circuit for Voltage Amplification Figure 15: Small-Signal Voltage Gain and Phase Shift vs. Frequency Test Circuit for Reference Impedance Figure 16: Reference Impedance vs. Frequency 6/10 Version: D14 TS432 Adjustable Precision Shunt Regulator Typical Performance Characteristics Test Circuit for Curve A 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 adjusted to determine the ranges of stability. Test Circuit for Curve B, C and D Figure 17: Stability Boundary Condition Test Circuit for Pulse Response, Ik=1mA Figure 18: Pulse Response 7/10 Version: D14 TS432 Adjustable Precision Shunt Regulator Electrical Characteristics Figure 19: Reference Voltage vs. Temperature Figure 20: Reference Current vs. Temperature Figure 21: Cathode Current vs. Cathode Voltage 8/10 Version: D14 TS432 Adjustable Precision Shunt Regulator SOT-23 Mechanical Drawing Unit: Millimeters Marking Diagram 2 = Device Code X = Tolerance Code (A = ±1%, B = ±0.5%) Y = Year Code M = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec) = Month Code for Halogen Free Product (O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep, X=Oct, Y=Nov, Z=Dec) L = Lot Code 9/10 Version: D14 TS432 Adjustable Precision Shunt Regulator 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. 10/10 Version: D14