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TS432
Adjustable Precision Shunt Regulator
TO-92
Pin Definition: 1. Reference 2. Anode 3. Cathode
SOT-23
Pin Definition: 1. Reference 2. Cathode 3. Anode
SOT-25
Pin Definition: 1. N/C 2. N/C * 3. Cathode 4. Reference 5. Anode * (pin 2 is connect to substrate and must be connected to Anode or left open)
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 0.05. Active output circuitry provides a very sharp turn-on characteristic, making TS432 series excellent replacement for zener diode in many applications.
Features
Precision Reference Voltage TS432 - 1.24V2% TS432A - 1.24V1% TS432B - 1.24V0.5% Minimum Cathode Current for Regulation: 20uA(typ.) Equivalent Full Range Temp. Coefficient: 50ppm/ C Programmable Output Voltage up to 18V Fast Turn-On Response Sink Current Capability of 80uA to 100mA Low Dynamic Output Impedance: 0.05 Low Output Noise Halogen Free Available
Ordering Information
Part No. Package Packing
TS432xCT B0 TO-92 1Kpcs / Bulk TS432xCT B0G TO-92 1Kpcs / Bulk TS432xCT A3 TO-92 2Kpcs / Ammo TS432xCT A3G TO-92 2Kpcs / Ammo TS432xCX RF SOT-23 3Kpcs / 7" Reel TS432xCX RFG SOT-23 3Kpcs / 7" Reel TS432xCX5 RF SOT-25 3Kpcs / 7" Reel TS432xCX5 RFG SOT-25 3Kpcs / 7" Reel Note: Where x denotes voltage tolerance Blank: 2%, A: 1%, B: 0.5% "G" denotes for Halogen free products

Application
Voltage Monitor Delay Timmer Constant -Current Source/Sink High-Current Shunt Regulator Crow Bar Over-Voltage / Under-Voltage Protection
Block Diagram
Absolute Maximum Rating (Ta = 25oC unless otherwise noted)
Parameter
Cathode Voltage (Note 1) Continuous Cathode Current Range Reference Input Current Range
Symbol
Vka Ik Iref
Limit
Unit
V mA mA W
o o
18 100 3 TO-92 0.625 Power Dissipation Pd SOT-23 0.35 SOT-25 0.35 Junction Temperature TJ +150 Operation Temperature Range TOPER 0 ~ +70 Storage Temperature Range TSTG -65 ~ +150 Note 1: Voltage values are with respect to the anode terminal unless otherwise noted. 1/12
C C o C
Version: C07
TS432
Adjustable Precision Shunt Regulator
Recommend Operating Condition
Parameter
Cathode Voltage (Note 1) Continuous Cathode Current Range
Symbol
Vka Ik
Limit
16 100
Unit
V mA
Recommend Operating Condition
Parameter
Reference voltage TS432 TS432A
Symbo
Vref
Test Conditions
Vka =Vref, Ik=10mA (Figure 1) o Ta=25 C Vka =Vref, Ik=10mA Ta= full range (Figure 1) Ika=10mA, Vka = 16V to Vref (Figure 2) R1=10K, R2= , Ika=10mA Ta= full range (Figure 2) R1=10K, R2= , Ika=10mA Ta= full range (Figure 2) Vref=0V (Figure 3), Vka=16V f<1KHz, Vka=Vref Ika=1mA to 100mA (Figure 1)
Min
1.215 1.227 1.233 -------
Typ
1.240
Max
1.264 1.252 1.246
Unit
V
TS432B 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. Off-state Cathode Current Dynamic Output Impedance
Vref Vref/Vka Iref Iref Ika(off) |Zka|
10 -1.0 0.25 0.04 0.125 0.2
25 -2.7 0.5 0.8 0.5 0.4
mV mV/V uA uA uA
Minimum Operating Cathod Ika(min) Vka=Vref (Figure 1) -20 80 uA 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, Vref is defined as:
Where: T2-T1 = full temperature change. Vref 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 postive, Vref=1.241V at 25 C, T=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:
2/12
Version: C07
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 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 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 10uF.
Applications Examples
Figure 4: Voltage Monitor
3/12
Figure 5: Output Control for Three Terminal Fixed Regulator
Version: C07
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
4/12
Version: C07
TS432
Adjustable Precision Shunt Regulator
Applications Examples (Continue)
Vin Vref
Vout V+ 0.74V
Figure 12: Single-Supply Comparator with TemperatureCompensated Threshold
Figure 13: Constant Current Sink
Figure 14: Delay Timer
5/12
Version: C07
TS432
Adjustable Precision Shunt Regulator
Typical Performance Characteristics
Test Circuit for Voltage Amplification
Figure 14: Small-Signal Voltage Gain and Phase Shift vs. Frequency
Test Circuit for Reference Impedance
Figure 15: Reference Impedance vs. Frequency
6/12
Version: C07
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 16: Stability Boundary Condition
Test Circuit for Pulse Response, Ik=1mA
Figure 17: Pulse Response
7/12
Version: C07
TS432
Adjustable Precision Shunt Regulator
Electrical Characteristics
Figure 18: Reference Voltage vs. Temperature
Figure 19: Reference Current vs. Temperature
Figure 20: Cathode Current vs. Cathode Voltage
8/12
Version: C07
TS432
Adjustable Precision Shunt Regulator
TO-92 Mechanical Drawing
DIM A B C D E F G H
TO-92 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 4.30 4.70 0.169 0.185 4.30 4.70 0.169 0.185 14.30(typ) 0.563(typ) 0.43 0.49 0.017 0.019 2.19 2.81 0.086 0.111 3.30 3.70 0.130 0.146 2.42 2.66 0.095 0.105 0.37 0.43 0.015 0.017
Marking Diagram
X = Tolerance Code (A = 1%, B = 0.5%, Blank = 2%,) 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
9/12
Version: C07
TS432
Adjustable Precision Shunt Regulator
SOT-23 Mechanical Drawing
DIM A A1 B C D E F G H I J
SOT-23 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 0.95 BSC 0.037 BSC 1.9 BSC 0.074 BSC 2.60 3.00 0.102 0.118 1.40 1.70 0.055 0.067 2.80 3.10 0.110 0.122 1.00 1.30 0.039 0.051 0.00 0.10 0.000 0.004 0.35 0.50 0.014 0.020 0.10 0.20 0.004 0.008 0.30 0.60 0.012 0.024 5 10 5 10
Marking Diagram
2 = Device Code X = Tolerance Code (A = 1%, B = 0.5%, C = 2%,) 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
10/12
Version: C07
TS432
Adjustable Precision Shunt Regulator
SOT-25 Mechanical Drawing
DIM A+A1 B C D E E H L 1 S1
SOT-25 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 0.09 1.25 0.0354 0.0492 0.30 0.50 0.0118 0.0197 0.09 0.25 0.0035 0.0098 2.70 3.10 0.1063 0.1220 1.40 1.80 0.0551 0.0709 1.90 BSC 0.0748 BSC 2.40 3.00 0.09449 0.1181 0.35 BSC 0.0138 BSC 0 10 0 10 0.95 BSC 0.0374 BSC
Marking Diagram
2 = Device Code X = Tolerance Code (A = 1%, B = 0.5%, C = 2%,) 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
11/12
Version: C07
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.
12/12
Version: C07

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