PLH Series

higher voltages without lower performance

As technology has changed, many products have moved from analog

controls to digital ones. Although digital controls suit many instruments,

they do not necessarily suit a bench power supply.

Customer research shows that many users prefer the speed and

simplicity of conventional analog controls for setting voltage and current.

Digital controls may offer greater precision, but often at the expense of

ease-of-use.

With this in mind, the PLH series has retained the true analog controls of

its best-selling sister products, the PL series.

The main disadvantage of analog controls is stability and security. The

settings of analog potentiometers can drift over time. More importantly,

the settings can be changed accidentally with potentially serious

consequences.

The PLH series incorporates S-Lock. One press of the Lock button

transfers control of voltage and current from the analog controls to

internal digital circuitry.

This offers not just complete security, but exceptional stability as well

with each setting controlled by an instrumentation quality DAC.

Linear regulation for best performance

Linear regulation still offers the lowest output noise and the best transient

response (recovery time from a sudden current step).

Despite the high output voltages, the PLH series maintains output noise figures

of below 2mV, and transient recovery times of better than 250µs.

In addition, the lack of a high frequency switching circuit reduces radiated

noise and common mode signals enabling the PLH series to be used in sensitive

environments.

Choose a voltage range that suits your task

When working with any particular piece of equipment, engineers often require a voltage

source variable over only a narrow range. Set the voltage too high and damage might occur,

set it too low and the circuit may reset.

That’s where the V-Span function of the PLH series comes in. It allows the user to redefine

the end-stop values of the voltage control to define a specific voltage range.

For example:

An engineer is working on a circuit that will eventually

operate from a peak rectified 110V rms ±5% supply.

They use V-Span to set a Vmax of 164 volts (to prevent

over-voltage damage) and a Vmin of 147 volts (to ensure

that the circuit doesn’t reset).

They now have a power supply which provides high

resolution analog control over the exact voltage range they

need.

Vmin and Vmax can be set anywhere between zero and

maximum output voltage subject only to Vmax > (Vmin + 1V).

The fine control gives additional adjustment of ±1%.

Once set, the voltage span function can be turned on or off at the press of a button*.

Higher voltage power supplies from Europe’s leading manufacturer

The PLH series is a development of the

best-selling New PL series of laboratory

bench power supplies which is available

in 15V, 30V and 60V variants (covered in a

separate brochure and on our web site). 

The PLH series retains the ultra compact

format, high power density, and smart

analog controls of the PL series but offers

voltages up to 250V to cover applications

beyond the capabilities of standard bench

PSUs and into areas such as magnetics.

TTi has been at the forefront of laboratory power supply design for

around thirty years during which it has re-defined the state-of-the-art for

switch mode products with its innovative Mixed-mode and PowerFlex

regulator designs.

Demand for linear regulated PSUs has remained strong and continuing

development of linear models has generated the lower cost ELR series,

and the advanced QL series in addition to the ever popular PL series.

The PLH and PLH-P series of linear regulated higher voltage dc power

supplies joins a large family of PSUs with power levels from 15 watts up

to 1200 watts.

See our web site for full details.

Analog controls with digital stability

Lock your settings

at the touch of

a button !

PLH series - 120V & 250V linear regulated laboratory power supplies