UDP5040-40 400W 40V/40A Programmable DC Switching Power Supply

The UNI-T UDP5040-40 is a single-channel 400W programmable DC switching power supply delivering 0–40V and 0–40A with auto-ranging across the rated power envelope. It pairs a wide output range with the regulation accuracy, source-emulation and remote control expected of a professional programmable supply.

Voltage accuracy is ±(0.05% of set + 0.05% of rated) and current accuracy ±(0.5% of set + 0.1% of rated); ripple is held to 50mV p-p with a 100 ppm/°C temperature coefficient. A 2.4-inch TFT-LCD shows voltage, current and power together, and full SCPI control over USB and LAN drops the UDP5040-40 straight into LabVIEW, Python-VISA or any ATE framework.

Choosing Your Model — UDP5000 Series

The UDP5000 name spans 20 models built on one platform: five voltage classes (40 V / 80 V / 160 V / 250 V / 800 V) across four power classes (400 W / 800 W / 1200 W / 2000 W). They differ only in output range and chassis size — control, accuracy, protection and interface are otherwise identical. Compare the full series before selecting:

Every model shares the same chassis architecture, control system, regulation accuracy, protection suite, and interface set. The 800 V UDP5800 tier does not support series connection; all other tiers support series and parallel combining. Choose by the voltage class that covers your rail and the power class that covers your load — output range and chassis height scale with power, the instrument does not change.

Key Features

• 400W / 0–40V / 0–40A — auto-ranging across the rated power envelope
• Voltage accuracy ±(0.05% of set + 0.05% of rated); current accuracy ±(0.5% of set + 0.1% of rated)
• Low ripple — 50mV p-p voltage, 80mA rms current (20 MHz BW)
• CC/CV priority slope modes — choose voltage-first or current-first turn-on for DUT safety
• Adjustable internal resistance to 1.000Ω — emulate batteries, fuel cells and solar sources
• List Mode — 128 programmable V/I/dwell steps, 1 to 9,999, infinite cycles, stand-alone
• Front and rear output terminals (front limited to 10 A)
• Multi-unit series/parallel — up to 4 parallel / 4 series
• USB + LAN with full SCPI 1999.0 / IEEE-488.2; 2.4-inch TFT-LCD
• Discharge-load control for rapid output bleed-down

UNI-T UDP5040-40 Details

Applications

Battery and Energy-Storage Test

The wide 0–40 V range covers 12 V to 36 V lithium-ion and LFP packs used in e-bike, power-tool and light-EV work. Internal-resistance emulation and List Mode let you reproduce charge profiles and varying pack states without cycling real cells.

New-Energy and Automotive Electronics

DC/DC converter input stages, inverter front ends and sub-40 V automotive ECUs benefit from the tight regulation, low ripple and CC/CV priority control.

Automated Test and Production

SCPI over USB or LAN plus stored List Mode sequences make the UDP5000 a clean fit for unattended characterisation, burn-in and end-of-line test.

Accessories and Family Options

In the box: power cord (destination-country standard, 1.8 m), four-conductor analog-interface flat cable (3.5 m), USB cable (1.5 m), M3 mounting screws, output-terminal protection cover, and rack distribution bracket.

The UDP5000 series spans 16 models on one platform — see Choosing Your Model above for the full voltage × power matrix if a different rail or load fits your application better.

Frequently Asked Questions

Can I use the front and rear output terminals at the same time?

Both terminal sets are parallel connections to the same single output. You can wire both, but the front terminals are limited to 10 A maximum — route high-current loads to the rear panel.

What is the difference between the VHS/IHS and VSR/ISR slope modes?

VHS (CV high-speed) and IHS (CC high-speed) use the supply's default fast rise and fall rates. VSR (CV slope) and ISR (CC slope) let you set the rise and fall rate so output ramps in controlled fashion — useful for capacitive and motor loads, and for sensitive analog circuits that need settling time.

Does the internal-resistance function need an external resistor?

No. The internal variable-resistance function electronically emulates source impedance (set in CV mode, up to 1.000Ω in 1 mΩ steps), so the supply behaves like a battery, fuel cell or solar source with no physical resistor and no added thermal risk.

Can multiple units be combined for more power?

Yes. Identical models combine for more current (parallel, up to 4 units) or more voltage (series, up to 4 units), controlled from the master unit or a single SCPI connection; unit-to-unit balance stays within ~5% of rated.

How does it integrate with automated test?

USB and LAN with full SCPI 1999.0 / IEEE-488.2 support LabVIEW, Python-VISA and any standard ATE framework; List Mode runs stored sequences stand-alone without a connected PC.