JFET

VPS8703 test board

Overview

VPS8703 is a transformer driver specially designed for micro-power isolated power supplies with small size and low standby power consumption. Its peripherals only need to be matched with simple input and output filter capacitors, isolation transformers and rectifier circuits to achieve an input voltage of 6.5~30V , isolated power supply with multiple output voltages and output power up to 15W. VPS8703 internally integrates two N-channel power MOSFETs and two P-channel power MOSFETs, and forms a bridge connection. The integrated oscillator inside the chip provides a pair of high-precision complementary signals, which can effectively ensure the high symmetry of the two power MOSFET drives and prevent the circuit from working.

Magnetization occurs during the process.

VPS8703 integrates frequency modulation function and multiple protection methods. Frequency adjustment can be achieved according to different application requirements. At the same time, a high-precision dead zone control circuit is designed internally to ensure that no common phenomenon occurs under various working conditions; over-current detection protection and over-temperature protection are integrated to avoid short circuit at the switching power supply output. Damage the device under abnormal circumstances.

Because the full-bridge topology is bipolar polarization, the design of the transformer is also extremely simple. It only needs to be calculated according to the volt-second balance theorem. The number of primary side turns can be calculated according to the following formula:

Among them, Dmax is the maximum pulse width, which is 1 in the full-bridge topology, ΔB is the saturation magnetic flux of the transformer in T, and Ae is the effective area of the transformer core in square centimeters.

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

Hot

Technical Resources More

Search Datasheet?

Supported by EEWorld Datasheet

Technical Videos More

Forum More

Update:2025-05-11 00:36:18

Packaging issues of chip capacitors
Is there any difference between the 0805 package of chip capacitors and the 0805 package of chip resistors?I use the 09 version. When choosing the capacitor package, I saw the 0805 package of capacito
Multi-task watchdog and feeding method
Watchdogs are divided into hardware watchdogs and software watchdogs. The hardware watchdog uses a timer circuit whose timing output is connected to the reset end of the circuit. The program clears th
Variable capacitor detection
1. Gently rotate the shaft by hand, it should feel very smooth, and should not feel sometimes loose, sometimes tight, or even stuck. When the carrier shaft is pushed forward, backward, up, down, left,
Why does the F28035 CLA only respond to task1?
When debugging the CLA program, triggering the CLA task only responds to TASK1, and the MIFR indication is normal. For example, when triggering task 2, MIFR=2, but task 1 is still executed. When using
Nonlinear distortion of transistor amplifier circuit and its solution
[p=30, null, left][font=宋体][size=4][color=#000000]Crystal transistors are widely used in modern circuits. Their main functions are amplification and switching. This article mainly analyzes the amplifi
vxworks sound card driver
Dear vxworks experts, who can write a sound card driver for vxworks? Can the files in the sound folder under the Drv file in the installation directory be used directly as sound card drivers? I search

Datasheet More

Circuits More