{"id":18965,"date":"2026-11-06T01:49:51","date_gmt":"2026-11-06T00:49:51","guid":{"rendered":"https:\/\/tps-elektronik.com\/?p=18965"},"modified":"2026-11-06T01:49:54","modified_gmt":"2026-11-06T00:49:54","slug":"how-to-achieve-low-ripple-and-stable-output-for-precision-circuit-development-with-tps-linear-desktop-dc-power-supply","status":"publish","type":"post","link":"https:\/\/tps-elektronik.com\/en\/how-to-achieve-low-ripple-and-stable-output-for-precision-circuit-development-with-tps-linear-desktop-dc-power-supply\/","title":{"rendered":"How to Achieve Low Ripple and Stable Output for Precision Circuit Development with TPS Linear Desktop DC Power Supply?"},"content":{"rendered":"<article class=\"product-blog\" lang=\"en\"><header>\n<p>For system integrators, panel builders, and engineering-driven procurement teams, selecting a bench power supply for precision circuit development is not only about voltage and current ratings.<\/p>\n<p>It also involves output ripple, load regulation, remote sensing, resolution, protection behavior, and whether the supply can deliver a repeatable setpoint at the device terminals \u2014 not just at its own output terminals.<\/p>\n<p>The <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/power-modules-dcdc-bidirectional-194\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><strong>EA-PSI 5040-40A<\/strong><\/a> is a microprocessor-controlled programmable desktop DC power supply with <strong>0-40V, 0-40A, 640W<\/strong> auto-ranging output, <strong>&lt;10mV RMS ripple<\/strong>, <strong>&lt;0.08% voltage load regulation<\/strong>, and <strong>&lt;1ms load regulation time<\/strong>. It is a switch-mode design with active PFC and up to 92% efficiency \u2014 a practical alternative to a traditional linear bench supply where low ripple and stable output matter more than the topology label.<\/p>\n<p>Typical applications include analog front-end development, sensor signal chain evaluation, low-noise regulator characterization, and automated R&amp;D test sequences.<\/p>\n<\/header><nav class=\"toc\" aria-label=\"Table of Contents\">\n<h2 id=\"toc-en\">Table of Contents<\/h2>\n<ol>\n<li><a href=\"#en-what-it-is\">What &#8220;linear-class&#8221; performance means in a desktop DC supply<\/a>\n<ol>\n<li><a href=\"#en-topology\">Topology reality: switch-mode with linear-class ripple<\/a><\/li>\n<li><a href=\"#en-ripple-spec\">Reading the ripple specification correctly<\/a><\/li>\n<\/ol>\n<\/li>\n<li><a href=\"#en-precision\">Why low ripple and stable output matter in precision circuits<\/a>\n<ol>\n<li><a href=\"#en-error-budget\">The measurement error budget<\/a><\/li>\n<li><a href=\"#en-load-step\">Load step and line step behaviour<\/a><\/li>\n<\/ol>\n<\/li>\n<li><a href=\"#en-features\">EA-PSI 5040-40A features for precision development<\/a>\n<ol>\n<li><a href=\"#en-auto-ranging\">Auto-ranging output and resolution<\/a><\/li>\n<li><a href=\"#en-remote\">Remote sensing, interfaces, and automation<\/a><\/li>\n<li><a href=\"#en-protection\">Protection and thermal behaviour<\/a><\/li>\n<\/ol>\n<\/li>\n<li><a href=\"#en-specs\">Product specifications<\/a><\/li>\n<li><a href=\"#en-rfq\">RFQ checklist<\/a><\/li>\n<li><a href=\"#en-faq\">FAQ<\/a><\/li>\n<\/ol>\n<\/nav>\n<section id=\"en-what-it-is\">\n<h2>1. What &#8220;linear-class&#8221; performance means in a desktop DC supply<\/h2>\n<p>A traditional linear bench supply regulates the output with a series pass transistor operating in its linear region. It produces very low switching noise, but it is inefficient, heavy, and generates significant heat. A switch-mode bench supply converts energy at high frequency and filters the output; modern designs can reach ripple levels that were once the exclusive domain of linear supplies.<\/p>\n<p>The EA-PSI 5040-40A belongs to the second category. Its specification \u2014 <strong>&lt;10mV RMS and &lt;80mV peak-to-peak ripple<\/strong> \u2014 is the number that matters for precision circuit development, not the topology label. In practice, a development bench that needs a clean DC rail for an analog front-end is comparing ripple, regulation, and resolution, and this supply is specified in those terms.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19099\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/10\/Desktop-DC-Power-Supply-Precision-Circuit-Development-Bench-1.jpg\" alt=\"Desktop DC Power Supply Precision Circuit Development Bench Pr\u00e4zisions-Gleichstromnetzteil f\u00fcr die Schaltungsentwicklung am Arbeitsplatz\" width=\"1920\" height=\"1079\" \/><\/p>\n<h3 id=\"en-topology\">1.1 Topology reality: switch-mode with linear-class ripple<\/h3>\n<p>It is important to state this clearly for procurement and engineering: the EA-PSI 5040-40A is a switch-mode supply, not a pure linear supply. It uses active power factor correction (&gt;0.99), reaches up to 92% efficiency, and uses a temperature-controlled fan. Those are advantages in a development lab \u2014 less heat, lower energy cost, quieter bench \u2014 but they are different from the characteristics of a large linear pass-transistor design.<\/p>\n<p>If a project mandates a pure linear topology for regulatory or historical reasons, that requirement should be stated in the RFQ, and a different model should be selected. For most precision development work, the relevant requirement is the output quality at the load, and that is where this supply&#8217;s specification applies.<\/p>\n<h3 id=\"en-ripple-spec\">1.2 Reading the ripple specification correctly<\/h3>\n<p>Ripple is meaningless without a measurement bandwidth. The EA-PSI 5040-40A specifies &lt;80mV peak-to-peak and &lt;10mV RMS. The peak-to-peak figure indicates the worst-case instantaneous deviation; the RMS figure indicates the noise power delivered to the load. For a low-noise analog rail, the RMS figure is usually the more relevant of the two, because it directly affects the noise floor of the circuit being developed.<\/p>\n<p>The measurement must be made at the load, with a short ground lead and a bandwidth limit on the oscilloscope. Measuring at the supply terminals with a long ground clip will show higher ripple that belongs to the probe loop, not to the supply.<\/p>\n<\/section>\n<section id=\"en-precision\">\n<h2>2. Why low ripple and stable output matter in precision circuits<\/h2>\n<p>A precision circuit under development is a measurement system in itself. The supply rail is part of that system, and its imperfections appear in the result \u2014 as offset, as noise, as drift, or as a transient that the circuit under test responds to.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19094\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/10\/Low-Ripple-Bench-PSU-Output-Measurement-Remote-Sense-2.jpg\" alt=\"Low Ripple Bench PSU Output Measurement Remote Sense Messung des Ausgangssignals eines Bench-Netzteils mit geringer Restwelligkeit (Fernerfassung)\" width=\"1920\" height=\"1079\" \/><\/p>\n<h3 id=\"en-error-budget\">2.1 The measurement error budget<\/h3>\n<p>Consider a sensor signal chain with a 10mV full-scale output. A supply with 10mV RMS ripple does not necessarily add 10mV to the signal, because the circuit&#8217;s power supply rejection ratio attenuates it. But at high frequency, PSRR falls, and the ripple that remains appears as noise on the output. In a 16-bit acquisition system, 10mV of rail noise can dominate the noise floor.<\/p>\n<p>The EA-PSI 5040-40A&#8217;s <strong>&lt;0.2% voltage accuracy<\/strong> and <strong>&lt;0.2% current accuracy<\/strong> also matter: when the engineer sets 3.300V, the supply should deliver 3.300V at the load, not 3.320V. Remote sensing is the mechanism that makes this true at the device terminals.<\/p>\n<h3 id=\"en-load-step\">2.2 Load step and line step behaviour<\/h3>\n<p>Precision circuits rarely draw constant current. A digital block wakes up, an ADC starts converting, a relay closes \u2014 and the rail must recover quickly. The <strong>&lt;1ms load regulation time<\/strong> and <strong>&lt;0.08% load regulation<\/strong> of the EA-PSI 5040-40A define how far the output deviates and how fast it returns. For a circuit that is sensitive to supply transients, this is as important as the steady-state ripple.<\/p>\n<p>Line regulation of <strong>&lt;0.02%<\/strong> covers mains voltage variation. In a shared laboratory where compressors, ovens, and welders are on the same distribution, this matters more than it does in a dedicated power lab.<\/p>\n<\/section>\n<section id=\"en-features\">\n<h2>3. EA-PSI 5040-40A features for precision development<\/h2>\n<div class=\"product-tabs\">\n<div class=\"tab-nav\"><button class=\"tab-btn active\" data-tab=\"tab-physical\">Physical Characteristics<\/button><br \/><button class=\"tab-btn\" data-tab=\"tab-electrical-tab\">Electrical Characteristics<\/button><br \/><button class=\"tab-btn\" data-tab=\"tab-protection\">Protection &amp; Compliance<\/button><\/div>\n<div id=\"tab-physical\" class=\"tab-content\">\n<h3>Physical Characteristics<\/h3>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Model<\/td>\n<td>EA-PSI 5040-40A<\/td>\n<\/tr>\n<tr>\n<td>Form factor<\/td>\n<td>Desktop, 200 \u00d7 87 \u00d7 331 mm<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>4.3 kg<\/td>\n<\/tr>\n<tr>\n<td>Display<\/td>\n<td>Blue LCD, set and actual values simultaneous<\/td>\n<\/tr>\n<tr>\n<td>Controls<\/td>\n<td>2 knobs, 5 buttons, 9 preset memory groups<\/td>\n<\/tr>\n<tr>\n<td>Cooling<\/td>\n<td>Temperature-controlled fan<\/td>\n<\/tr>\n<tr>\n<td>Interfaces<\/td>\n<td>USB, Ethernet, galvanically isolated analog<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19089\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/10\/Precision-Bench-Power-Supply-Auto-Ranging-Output-40V-40A-3.jpg\" alt=\"Precision Bench Power Supply Auto-Ranging Output 40V 40A Pr\u00e4zisions-Labornetzger\u00e4t mit automatischem Bereichswechsel, Ausgang 40 V \/ 40 A\" width=\"1920\" height=\"1079\" \/><\/p>\n<\/div>\n<div id=\"tab-electrical-tab\" class=\"tab-content\" style=\"display: none;\">\n<h3>Electrical Characteristics<\/h3>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>AC input<\/td>\n<td>90-264 V AC, 45-65 Hz<\/td>\n<\/tr>\n<tr>\n<td>Power factor<\/td>\n<td>&gt;0.99 active PFC<\/td>\n<\/tr>\n<tr>\n<td>Efficiency<\/td>\n<td>Up to 92%<\/td>\n<\/tr>\n<tr>\n<td>Output voltage<\/td>\n<td>0-40 V DC, auto-ranging<\/td>\n<\/tr>\n<tr>\n<td>Output current<\/td>\n<td>0-40 A DC, auto-ranging<\/td>\n<\/tr>\n<tr>\n<td>Output power<\/td>\n<td>0-640 W<\/td>\n<\/tr>\n<tr>\n<td>Voltage load regulation<\/td>\n<td>&lt;0.08%<\/td>\n<\/tr>\n<tr>\n<td>Voltage line regulation<\/td>\n<td>&lt;0.02%<\/td>\n<\/tr>\n<tr>\n<td>Ripple (PP \/ RMS)<\/td>\n<td>&lt;80 mV pp \/ &lt;10 mV RMS<\/td>\n<\/tr>\n<tr>\n<td>Load regulation time<\/td>\n<td>&lt;1 ms<\/td>\n<\/tr>\n<tr>\n<td>Voltage accuracy<\/td>\n<td>&lt;0.2%<\/td>\n<\/tr>\n<tr>\n<td>Current accuracy<\/td>\n<td>&lt;0.2%<\/td>\n<\/tr>\n<tr>\n<td>Power accuracy<\/td>\n<td>&lt;1%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div id=\"tab-protection\" class=\"tab-content\" style=\"display: none;\">\n<h3>Protection &amp; Compliance<\/h3>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Protections<\/td>\n<td>OVP, OCP, OPP, OTP<\/td>\n<\/tr>\n<tr>\n<td>Safety<\/td>\n<td>SELV compliant (EN 60950) for 40V model<\/td>\n<\/tr>\n<tr>\n<td>EMC<\/td>\n<td>EN 55022 Class B<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h3 id=\"en-auto-ranging\">3.1 Auto-ranging output and resolution<\/h3>\n<p>The 0-40V, 0-40A, 640W auto-ranging output means the supply can deliver high current at low voltage or high voltage at lower current within the 640W envelope. A 3.3V digital board and a 24V analog stage can be powered by the same instrument without swapping units. For a development bench that supports multiple projects, this reduces equipment count and bench clutter.<\/p>\n<h3 id=\"en-remote\">3.2 Remote sensing, interfaces, and automation<\/h3>\n<p>Remote sensing compensates for the voltage drop in the test leads, so the setpoint is maintained at the load. This is essential for precision work: with 40A through a 10m\u03a9 lead pair, the drop is 400mV \u2014 far larger than the accuracy specification of the supply itself.<\/p>\n<p>The supply supports USB, Ethernet, and a galvanically isolated analog interface, and is compatible with SCPI, LabView VIs, and Windows control software. For automated R&amp;D sequences \u2014 voltage sweeps, load profiles, burn-in \u2014 this removes manual setpoint changes and reduces operator error. The <a href=\"https:\/\/tps-elektronik.com\/en\/category\/production\/\">TPS production category<\/a> and <a href=\"https:\/\/tps-elektronik.com\/en\/category\/blog-content\/\">TPS blog content<\/a> provide additional application context.<\/p>\n<h3 id=\"en-protection\">3.3 Protection and thermal behaviour<\/h3>\n<p>OVP, OCP, OPP, and OTP protect both the supply and the circuit under development. Set OVP just above the expected rail voltage, and OCP just above the expected current, so that a fault in the DUT triggers a controlled shutdown rather than damage. The temperature-controlled fan keeps acoustic noise low at partial load, which matters on a bench where the engineer sits for hours.<\/p>\n<p>For related high-current test hardware, see the <a href=\"https:\/\/www.shop-tps.com\/shop\/tps-dm570t1512kif-27873?category=194\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">TPS-DM570T1512KIF<\/a> and <a href=\"https:\/\/www.shop-tps.com\/shop\/tps-dm570t1512kirf-27874?category=194\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">TPS-DM570T1512KIRF<\/a> bidirectional DC-DC modules.<\/p>\n<\/section>\n<section id=\"en-specs\">\n<h2>4. Product specifications<\/h2>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>EA-PSI 5040-40A<\/th>\n<th>Typical entry-level bench supply<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Output<\/td>\n<td>0-40V \/ 0-40A \/ 640W, auto-ranging<\/td>\n<td>0-30V \/ 0-5A \/ 150W, fixed range<\/td>\n<\/tr>\n<tr>\n<td>Ripple (RMS)<\/td>\n<td>&lt;10 mV<\/td>\n<td>Often unspecified<\/td>\n<\/tr>\n<tr>\n<td>Voltage load regulation<\/td>\n<td>&lt;0.08%<\/td>\n<td>0.1-0.5%<\/td>\n<\/tr>\n<tr>\n<td>Load regulation time<\/td>\n<td>&lt;1 ms<\/td>\n<td>Often unspecified<\/td>\n<\/tr>\n<tr>\n<td>Voltage accuracy<\/td>\n<td>&lt;0.2%<\/td>\n<td>0.5-1%<\/td>\n<\/tr>\n<tr>\n<td>Remote sensing<\/td>\n<td>Yes<\/td>\n<td>Usually no<\/td>\n<\/tr>\n<tr>\n<td>Interfaces<\/td>\n<td>USB, Ethernet, isolated analog<\/td>\n<td>USB optional<\/td>\n<\/tr>\n<tr>\n<td>Presets<\/td>\n<td>9<\/td>\n<td>2-4<\/td>\n<\/tr>\n<tr>\n<td>Efficiency<\/td>\n<td>Up to 92%<\/td>\n<td>Lower, more heat<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19084\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/10\/RD-Bench-DC-Source-SCPI-LabView-Automation-4-1.jpg\" alt=\"R&amp;D Bench DC Source SCPI LabView Automation F&amp;E-Bank DC-Quelle SCPI LabView-Automatisierung\" width=\"1920\" height=\"1079\" \/>The comparison shows where the specification matters. The auto-ranging envelope and the remote sensing are the two features that change how the bench is used day to day.<\/p>\n<\/section>\n<section id=\"en-rfq\">\n<h2>5. RFQ checklist<\/h2>\n<p>To streamline quotation and evaluation for a <strong>desktop dc power supply<\/strong> used in precision circuit development, provide the following information:<\/p>\n<ul>\n<li><strong>Voltage and current range<\/strong>: Maximum rail voltage and peak current for the circuits under development<\/li>\n<li><strong>Ripple requirement<\/strong>: RMS and peak-to-peak limits, and the measurement bandwidth to be used<\/li>\n<li><strong>Regulation requirement<\/strong>: Load and line regulation targets, and the acceptable load-step recovery time<\/li>\n<li><strong>Resolution and accuracy<\/strong>: Setpoint resolution and accuracy needed for the application<\/li>\n<li><strong>Remote sensing<\/strong>: Whether sensing at the load is required<\/li>\n<li><strong>Automation interface<\/strong>: USB, Ethernet, isolated analog, and the control software environment<\/li>\n<li><strong>Topology requirement<\/strong>: Whether a pure linear topology is mandated, or whether output quality is the deciding criterion<\/li>\n<li><strong>Documentation<\/strong>: Calibration certificate, test report, and compliance documentation<\/li>\n<\/ul>\n<p>Providing these details reduces clarification cycles. TPS&#8217;s engineering team can support supply selection, ripple measurement setup, and automation integration as part of the RFQ process.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19104\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/10\/HEA3588-EA-PSI-5040-40A-3.png\" alt=\"EA-PSI 5040-40A desktop dc power supply\" width=\"1024\" height=\"576\" \/><\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/www.shop-tps.com\/shop\/category\/power-modules-dcdc-bidirectional-194\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Submit your desktop DC supply RFQ \u2192<\/a><\/p>\n<\/section>\n<section id=\"en-faq\">\n<h2>6. FAQ<\/h2>\n<p><strong>Is the EA-PSI 5040-40A a linear power supply?<\/strong><br \/>No. It is a switch-mode supply with active PFC, up to 92% efficiency, and a temperature-controlled fan. Its ripple specification (&lt;10mV RMS, &lt;80mV pp) is low enough for most precision development work, but the topology is switch-mode. If a pure linear topology is mandatory, state that in the RFQ and a different model will be selected.<\/p>\n<p><strong>How should ripple be measured to compare with the datasheet?<\/strong><br \/>Measure at the load terminals, with a short ground lead and a bandwidth limit on the oscilloscope. Use remote sensing. Measuring at the supply output with a long ground clip will include probe-loop pickup that does not belong to the supply.<\/p>\n<p><strong>Why does remote sensing matter for precision circuits?<\/strong><br \/>Remote sensing closes the regulation loop at the load, compensating for the voltage drop in the test leads. At 40A through a 10m\u03a9 lead pair, the drop is 400mV \u2014 far larger than the supply&#8217;s accuracy specification. Without remote sensing, the setpoint at the device is not the setpoint at the supply.<\/p>\n<p><strong>Can the supply be automated for R&amp;D test sequences?<\/strong><br \/>Yes. It supports USB, Ethernet, and a galvanically isolated analog interface, and is compatible with SCPI, LabView VIs, and Windows control software. Voltage sweeps, load profiles, and burn-in sequences can be scripted.<\/p>\n<p><strong>What is the advantage of the auto-ranging output?<\/strong><br \/>The 0-40V, 0-40A, 640W auto-ranging envelope allows high current at low voltage or high voltage at lower current within the same 640W limit. One instrument covers low-voltage digital boards and higher-voltage analog stages, reducing bench equipment count.<\/p>\n<\/section>\n<footer style=\"background: #2d5797; padding: 30px; border-radius: 14px; margin-top: 40px;\">\n<p style=\"color: #ffffff; font-size: 16px; line-height: 1.6; margin: 0;\"><strong>Next step:<\/strong> For precision circuit development requiring &lt;10mV RMS ripple, &lt;0.08% load regulation, remote sensing, and automated control, the <strong>EA-PSI 5040-40A<\/strong> is a validated desktop DC supply. <a style=\"color: #ffffff; font-weight: 600; text-decoration: underline;\" href=\"https:\/\/www.shop-tps.com\/shop\/category\/power-modules-dcdc-bidirectional-194\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">View TPS power modules \u2192<\/a><\/p>\n<\/footer><\/article>\n\n<style id=\"wpforms-css-vars-4659-block-e8187460-1b75-46e0-a763-3fe380056692\">\n\t\t\t\t#wpforms-4659.wpforms-block-e8187460-1b75-46e0-a763-3fe380056692 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It also involves output ripple, load regulation, remote sensing, resolution, protection behavior, and whether the supply can deliver a repeatable setpoint at the device terminals \u2014 not just at\u2026 <a href=\"https:\/\/tps-elektronik.com\/en\/how-to-achieve-low-ripple-and-stable-output-for-precision-circuit-development-with-tps-linear-desktop-dc-power-supply\/\">Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":19104,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[53],"tags":[],"class_list":["post-18965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-production"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TPS Desktop DC Power Supply - TPS<\/title>\n<meta name=\"description\" content=\"Desktop DC power supply for precision circuit development with under 10mV RMS ripple and stable output. 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