Ymin Capacitors Solve The Power Supply Dilemma Of AI Server Cpus/Gpus

(MENAFN- Market Press Release) February 2, 2026 9:23 pm - Solving the power supply dilemma of AI server CPUs/GPUs: How to stabilize voltage at the nanosecond level? How to filter out MHz noise?

I. Application Issues of Ultra-Low ESR (?3m?) in AI Server VRM

Main Question 1: Our CPU power supply has a very poor transient response, and measurements show a large voltage drop. Is it because the VRM ESR of the output capacitor is too high? Are there any capacitors with an ESR below 4m? that you would recommend?

Q1:
Question: When debugging the CPU power supply VRM of an AI server, the core voltage transient drop exceeds the standard. After optimizing the PCB layout and increasing the number of output capacitors, the discharge slope is still not ideal, and we suspect that the capacitor's ESR is too high. How can we accurately measure or evaluate the actual ESR of the capacitor in the circuit? Besides the datasheet, what are some practical methods for on-board verification?

Answer: For this scenario, we recommend Yongming MPS series multilayer solid-state capacitors, with an ESR as low as?3m? (@100kHz), comparable to high-end Japanese competitors. On-board verification can be done by observing the voltage recovery speed through load step testing or by measuring the impedance curve with a network analyzer. After replacement, there is no need to redesign the compensation loop. We recommend performing transient response testing to confirm the improvement effect.

Q2:

Question: During high-temperature testing of the GPU power supply module, the voltage drop intensified, and thermal imaging showed that the capacitor area temperature exceeded 85°C. It is known that ESR has a positive temperature coefficient. When evaluating the high-temperature performance of capacitors, in addition to the room temperature ESR value, should we focus on the ESR drift curve across the entire temperature range? Which materials or structures result in smaller temperature drift for capacitors?

Answer: The ESR stability of capacitors across the entire temperature range of -55°C to 105°C should be the primary focus. Yongming MPS series multilayer polymer solid capacitors, with their stable solid electrolyte and multilayer structure, maintain an ESR increase of less than 15% at 85°C compared to 25°C, making them suitable for high-temperature, high-reliability scenarios in AI servers.

Q3: Question: Due to limited PCB layout space, it is impossible to reduce the overall ESR by using parallel capacitors. The existing single capacitor has an ESR of approximately 5m?, resulting in substandard transient response. What are the impedance characteristics of single, large-capacity multilayer solid capacitors with ESR below 3m? on the market at high frequencies above 1MHz? Is the high-frequency filtering effect affected by the structure?

Answer: High-quality low-ESR multilayer solid capacitors (such as the Yongming MPS series) achieve both low ESR and low ESL (equivalent series inductance) through optimized internal electrode structure. They maintain low impedance even in the 1MHz-10MHz high-frequency range, providing excellent high-frequency filtering. Their impedance-frequency curves overlap with those of leading international brands of the same specifications, without affecting power supply integrity design.

Q4: Question: In multi-phase VRM designs, current imbalance between phases is suspected to be related to the consistency of ESR in each phase's output capacitors. Even using capacitors from the same batch has limited improvement. In high-performance AI server power supply designs, what level of batch consistency and dispersion of capacitor ESR should be achieved? Does the manufacturer provide relevant statistical distribution data?

Answer: High-performance capacitors require strict control of ESR consistency. The Yongming MPS series, relying on fully automated production processes, controls the ESR dispersion within each batch to within ±10%, and provides detailed batch parameter statistical reports to meet the high-power power supply design requirements of multi-phase current sharing.

Q5: Question: Besides expensive network analyzers, what are some simple methods for qualitative or semi-quantitative evaluation of capacitor ESR and discharge speed in engineering settings? When performing step tests with an electronic load, how can effective parameters be extracted from the voltage drop waveform to compare the performance of different capacitors?

Answer: Load step testing is a simple and effective method. Focus on two core parameters: the maximum voltage drop amplitude (?V) and the time it takes for the voltage to recover to a stable value. A smaller?V and shorter recovery time indicate a lower equivalent ESR and faster response of the capacitor network. Leading suppliers like Yung Ming provide application notes to guide test setup and data interpretation, quantifying the improvement effect of ultra-low ESR capacitors.

II. Thermal Management Issues Regarding High Ripple Current and High Temperature Stability
Main Question 2: After prolonged machine operation, capacitors become extremely hot, and the ambient temperature is also high. I'm worried they might fail over time. Are there any 560?F capacitors with exceptionally high ripple current that can withstand temperatures up to 105?? Capacity is also important.

Q6: Question: When the AI??server is fully loaded, the temperature of the capacitor area in the GPU power supply circuit exceeds 90°C. The calculated ripple current requirement is approximately 8.5A. The existing capacitors have insufficient rated ripple current at high temperatures. How should the ripple current value in the datasheet be interpreted when selecting a capacitor? For example, for a capacitor labeled "10.2A @ 45°C", how much is the actual usable current derating at 85°C?

Answer: Ripple current needs to be calculated according to the temperature-derating curve. Yongming MPS series capacitors are rated at 10.2A ripple current (@45°C). At 85°C, the effective ripple current is still?8.2A, with a derating of only about 20%. Low loss and excellent thermal design ensure stable operation at high temperatures.

Q7: Question: After increasing the PCB copper foil thickness from 1oz to 2oz, the capacitor temperature rise improvement still did not meet the standard. For capacitors that withstand ripple currents above 10A, besides copper thickness, what other PCB design factors significantly affect the operating temperature? Are there any recommended layout and heat dissipation via design guidelines?

Answer: PCB design should ensure short and wide current paths to reduce loop impedance. For high ripple current capacitors such as the Yongming MPS series, it is recommended to arrange a heat dissipation via array around the capacitor pads and connect it to the ground plane. Combined with its ultra-low ESR of?3m?, typical temperature rise can be controlled within 15°C.

Q8: Question: In a multi-phase VRM, even with uniform capacitor arrangement, the temperature of the capacitors in the middle phase is still 5-8°C higher than that on both sides, suspected to be caused by airflow and layout asymmetry. How can the thermal stress of each phase be balanced through capacitor layout or selection strategies?

Answer: A capacitor model with a higher ripple current rating can be selected for the central hot phase, or two capacitors can be connected in parallel to share the heat load. For example, using the Yongming MPS series high-Irip capacitor for local reinforcement can optimize the system's thermal distribution without changing the overall capacitor capacity.

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