User's Guide
SLVUAE7 – April 2015
ATL431 Adjustable Shunt Regulator EVM
1
Overview
The ATL431EVM is an adjustable voltage reference evaluation module that demonstrates the ATL431
integrated circuit from Texas Instruments (TI).
The ATL431 is a low-power counterpart to the TL431 and TLV431, having lower minimum cathode
current (Ik
min
= 35
μ
A vs 0.1/1.0 mA). Like TL431, ATL43x is used in conjunction with its key
components to behave as a single voltage reference, error amplifier, voltage clamp or comparator with
integrated reference.
The ATL431 can be operated and adjusted to cathode voltages from 2.5 V to 36 V, making this part
optimum for a wide range of end equipment in industrial, auto, telecom, and computing. In order for
this device to behave as a shunt regulator or error amplifier, > 35
μ
A (I
min
(max)) must be supplied into
the cathode pin. Under this condition, feedback can be applied from the Cathode and Ref pins to
create a replica of the internal reference voltage.
The EVM is configured with resistor options to set the cathode current, resistor options to set the
cathode voltage, and load capacitor options to check stability. A test point can be connected to an
external power supply to provide power. All of the ATL431 input and output pins are accessible for
external connection via test points.
1.1
ATL431EVM Features
•
Multiple resistor options for cathode current setting
•
Multiple resistor options for cathode voltage setting
•
Open 0805 footprints for user resistor option
•
Multiple capacitor options for stability and transient response measurement
•
Test points for voltage measurement
Table 1. ATL431EVM Specification
Key Parameters
Supply Voltage:
0 V – 40 V
Programmable Cathode Voltage:
2.5 V – 36 V
Cathode Current:
35 µA to 100 mA
CAUTION
Applying voltages above the limitations given in
may cause permanent
damage to your hardware.
Gerber (layout) files are available at www.ti.com.
1
SLVUAE7 – April 2015
ATL431 Adjustable Shunt Regulator EVM
Copyright © 2015, Texas Instruments Incorporated
