1 Features

1• Up to 60 V Input to Output Differential

• 1.5-A Output Current

• Line Regulation 0.01%/V (Typical)

• Load Regulation 0.1% (Typical)

• 80-dB Ripple Rejection (Typical)

• Internal Short-Circuit Current Limiting Protection

• Thermal Overload Protection

• –55 to 150°C Operating Temperature Range

(LM117HV)

• 0 to 125°C Operating Temperature Range

(LM317HV)

2 Applications

• Industrial Power Supplies

• PLC Systems

• Factory Automation Systems

• Building Automation Systems

• Battery Charger

3 Description

The LMx17HV is an adjustable 3-terminal positive

voltage regulator capable of supplying 1.5 A or more currents over a 1.25-V to 57-V output voltage range.

It requires only two external resistors to set the output

voltage. The LMx17HV is packaged in standard

transistor packages that are easily mounted and handled.

The LMx17HV offers overload protection like current limit, thermal overload protection and safe area

protection, which make the device blowout proof. The

overload protection circuitry remains fully functional

even if the adjustment terminal is disconnected.

Typically, no capacitors are needed unless the device

is situated more than 6 inches from the input filter

capacitors, in which case an input bypass is needed.

An optional output capacitor can be added to improve

transient response. The adjustment terminal can be

bypassed to achieve very high ripple rejection ratios

which are difficult to achieve with standard 3-terminal

regulators.

Since the regulator is floating and sees only the inputto-

output differential voltage, supplies of several

hundred volts can be regulated as long as the

maximum input to output differential is not exceeded,

or in other words, do not short the output to ground.

By connecting a fixed resistor between the

adjustment and output, the LMx17HV can also be

used as a precision current regulator. Supplies with

electronic shutdown can be achieved by clamping the

adjustment terminal to ground, which programs the

output to 1.25 V where most loads draw little current.