進入展臺在線留言

直播推薦

更多>

數字孿生賦能新型工業化分論壇直播回放

企業動態

更多>

推薦展會

更多>

2025第十一屆中國國際機電產品交易會暨先進制造業博覽會

展會城市：合肥市展會時間：2025-09-20

MINMAX電源模塊的應用

2011年03月24日 14:29:22人氣：2806來源：北京賽為達科技有限公司

General Test Set-Up
Figure 1 shows a general equipment set-up for testing DC/DC converters. Except where otherwise required, the following conditions should be applied:

● Nominal DC input voltage
● +25°C ambient temperature
● Full rated output load

Measurements

All connections to the converters should be made with great care, especially to the output pins. Standard four-terminal or Kelvin, measurement practices should always be observed in making DC/DC converters measurements. Figure 2 shows a voltage measurement being made from the output terminals of a DC/DC converter by means of separate contacts that do not carry load current. If contacts carrying load current are used for measurement, an erroneous reading of many millivolts can be resulted.

Output Voltage Accuracy
Make and record the following measurements:

1.Output voltage at nominal input voltage （VON）.

Output Voltage Accuracy =	VO - VON	X *
	VON
VO is output voltage specified in the data sheet.

2.Output voltage accuracy is derived by the formula.

Line Regulation
Unregulated
Make and record the following measurements:

1.Output voltage at nominal input voltage （VON）.

Line Regulation =	VO - VD	X *
	VON
	?VIN%
VD is maximum output voltage deviation measured.

2.Output voltage at maximum input voltage （VOH）.

3.Output voltage at minimum input voltage （VOL）.

4.Line regulation is derived by the formula.

Regulated
Make and record the following measurements:

1.Output voltage at nominal input voltage （VON）.

Line Regulation =	VO - VD	X *
	VON

VD is maximum output voltage deviation measured.

2.Output voltage at maximum input voltage （VOH）.

3.Output voltage at minimum input voltage （VOL）.

4.Line regulation is derived by the formula.

Load Regulation
Make and record the following measurements:

1.Output voltage at full load （VOF）.

Load Regulation =	VOM - VOF	X *
	VOF

2.Output voltage at minimum load specified in the data sheet （VOM）.

3.Load regulation is derived by the formula.

Efficiency
Make and record the following measurements:

1.Output voltage at nominal input voltage （VON）.

Efficiency =	VON x IO	X *
	VIN x IIN

VIN is nominal input voltage and IO is output current.

2.Input Current at nominal input voltage （IIN）.

3.Efficiency is derived by the formula.

Output Ripple & Noise

This is an AC measurement at the output of a power converter at rated load and +25°C ambient temperature. The Measurement is made in either millivolts RMS or millimvolts peak-to-peak. Figure 3 shows the typical voltage waveform.

In the case of DC/DC converters, the output ripple voltage is a series of small pulses with high frequency content and for this reason, it is almost always specified as peak-to-peak rather than RMS value. A 50 millivolts peak-to-peak output ripple from a DC/DC converter can have a very low RMS value – perhaps just 5V – but this type of specification would be of questionable value to the designer who must specify the power supply for his system.

Because of the high frequency content of this ripple, special measurement techniques must be employed so that correct measurements are obtained. First, a 20MHz bandwidth oscilloscope is normally used for the measurement so that all significant harmonics of the ripple spikes are included.

The actual ripple voltage measurement must be carefully made in order not to induce error voltages in the test equipment. Therefore, the conventional ground clip on an oscilloscope probe （see Figure 4） should never be used in this type of measurement. This clip, when placed in a field of radiated high frequency energy, acts as an antenna or inductive pickup loop, creating an extraneous voltage that is not part of the output noise of the converter.

This noise pickup is eliminated as shown in Figure 5 by using a scope probe with an external ground band or ring and pressing this band directly against the output common terminal of the power converter while the tip contacts the voltage output terminal. This makes the shortest possible connection across the output terminals.

Another method of measuring the output voltage ripple & noise that is specified for many switching power supplies is shown in Figure 6. A 30cm twisted pair of no. 20 AWG copper wire is connected to a 10uF capacitor of proper polarity and voltage rating. The oscilloscope probe ground led should connect right to the ground ring of the probe and be as short as possible. The oscilloscope bandwidth should be at 20MHz and connected to AC ground.

上一篇：MINMAX 電源模塊的應用

下一篇：安全閥的概念分類及選用技巧

全年征稿/資訊合作 聯系郵箱：[email protected]

免責聲明

凡本網注明"來源：智能制造網"的所有作品，版權均屬于智能制造網，轉載請必須注明智能制造網，http://m.lfljgfsj.com。違反者本網將追究相關法律責任。
企業發布的公司新聞、技術文章、資料下載等內容，如涉及侵權、違規遭投訴的，一律由發布企業自行承擔責任，本網有權刪除內容并追溯責任。
本網轉載并注明自其它來源的作品，目的在于傳遞更多信息，并不代表本網贊同其觀點或證實其內容的真實性，不承擔此類作品侵權行為的直接責任及連帶責任。其他媒體、網站或個人從本網轉載時，必須保留本網注明的作品來源，并自負版權等法律責任。
如涉及作品內容、版權等問題，請在作品發表之日起一周內與本網聯系，否則視為放棄相關權利。

国产免费一区二区三区最新不卡_gogo全球大胆高清人露出91_国产无遮挡一区二区三区毛片日本_免费淫视频_俄罗斯16一20sex牲色另类_免费观看黄色片视频

MINMAX電源模塊的應用

免責聲明