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TS431AIYLTSTN/a1690avaiLow voltage adjustable shunt reference
TS431BIYLTSTN/a800avaiLow voltage adjustable shunt reference
TS431IYLTSTN/a4500avaiLow voltage adjustable shunt reference


TS431IYLT ,Low voltage adjustable shunt referenceElectrical characteristics TS431 Figure 2. Reference voltage vs. temperature Figure 3. Test ..
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TS431AIYLT-TS431BIYLT-TS431IYLT
Low voltage adjustable shunt reference
March 2013 DocID5558 Rev 10 1/14
TS431

Low voltage adjustable shunt reference
Datasheet - production data


Features
Low voltage operation: 1.24 to 6 V 2 %, 1 % and 0.5 % voltage precision Wide operating range cathode current: 60 µA
to 30 mA Low output impedance: 0.2  Typically stable for any capacitive loads ESD protection: Human body model: 2 kV Machine model: 200 V 100 ppm/°C temperature coefficient Automotive grade version available
Description

The TS431 is a low-voltage, three-terminal,
programmable shunt voltage reference. The
output voltage can be set to any value between
Vref (1.24 V) and 6 V using two external resistors.
The TS431 is able to operate at a lower voltage
(1.24 V) and lower cathode current than the
widely-used TL431 and TL1431 shunt voltage
reference. When driving an optocoupler, the
TS431 is particularly suitable for regulating 3.3 V
switching power supplies.
Absolute maximum ratings and operating conditions TS431
2/14 DocID5558 Rev 10 Absolute maximum ratings and operating conditions


Table 1. Absolute maximum ratings
Tjunction = 150 °C, Tamb = 25 °C with RthJA = 200 °C/W for TO92 package andRthJA = 250 °C/W for SOT23-5L package
Table 2. Operating conditions
Please refer to Section 3: Application information for more details.
DocID5558 Rev 10 3/14
TS431 Electrical characteristics
2 Electrical characteristics


2.1 Definition of output voltage change over temperature range

Vref is defined as the difference between the maximum and minimum values obtained over
the full temperature range.
Vref = Vref max - Vref min
Figure 1. Output voltage change over temperature range
Table 3. Tamb = 25°C (unless otherwise specified)
Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and by design. See definition below.
Electrical characteristics TS431 DocID5558 Rev 10



Figure 2. Reference voltage vs. temperature Figure 3. Test circuit for VKA = Vref
Figure 4. Cathode voltage vs. cathode current Figure 5. Cathode voltage vs. cathode current
Figure 6. Reference input current vs.
temperature
Figure 7. Static impedance vs. temperature
TS431 Electrical characteristics



Figure 8. Off-state current vs. temperature Figure 9. Test circuit for off-state current
measurement
Figure 10. Ratio of change in reference input
voltage to change in VKA voltage vs.
temperature
Figure 11. Test circuit for VKA > Vref
Figure 12. Phase and gain vs. frequency Figure 13. Test circuit for phase and gain
measurement
Electrical characteristics TS431



Figure 14. Pulse response at Ik = 100 µA Figure 15. Test circuit for pulse response at
Ik = 100 µA
Figure 16. Pulse response at Ik = 1mA Figure 17. Test circuit for pulse response atk = 1 mA
Figure 18. Equivalent input noise vs. frequency
DocID5558 Rev 10 7/14
TS431 Application information
3 Application information

The TS431 is a general-purpose low-power programmable shunt voltage reference, capable
of operating with a cathode current as low as 60 µA and up to 30 mA.
The main static parameters of the TS431 voltage reference are specified in Table3.
Since the TS431 is designed for general-purpose applications with a broad range of
cathode currents, voltages and loads, when designing with the device in applications
requiring fast dynamic response (turn-on/off and/or pulsed load conditions) it should be
considered that upon application of power, the time required for the VKA voltage to reach its
final value within a specified error range depends on several factors, among which the
temperature, cathode current and capacitive load inrush current are the most influential. The
dynamic response of the device to fast turn-on/off, load and temperature changes is
optimized when the cathode current is not in the lower end of the operating range
(IK> 500 µA).
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