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LM317HV-MIL

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SNVSAY1 – JUNE 2017

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Copyright © 2017, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM317HV-MIL is a high voltage input capable linear regulator with overload protection. Due to its wide input

voltage range, the LM317HV-MIL serves a variety of applications and provides a precise voltage regulation with

low dropout across a wide output voltage and load current range. The device regulates a constant 1.25 V

Capacitors at the input help filter the input power supply, while the output capacitors aid in transient response

stability. A bypass capacitor can be placed between ADJ pin and ground (across R2) to improve ripple rejection.

8.2 Typical Applications

8.2.1 1.25-V to 45-V High Voltage Adjustable Regulator

The device can be used as an adjustable regulator to allow a variety of output voltages for high voltage

applications. By using an adjustable R2 resistor, a variety of output voltages can be made possible as shown in

Figure 16.

Full output current not available at high input-output voltages

†Optional—improves transient response. Output capacitors in the range of 1 μF to 1000 μF of aluminum or tantalum

electrolytic

are commonly used to provide improved output impedance and rejection of transients.

*Needed if device is more than 6 inches from filter capacitors.

††

Figure 16. 1.25-V to 45-V High Voltage Adjustable Regulator

8.2.1.1 Design Requirements

The device component count is very minimal, employing two resistors as part of a voltage divider circuit and an

output capacitor for load regulation. An input capacitor is needed if the device is more than 6 inches from filter

capacitors. An optional bypass capacitor across R2 can also be used to improve PSRR.