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To fully answer five questions of SMD diodes
Editor:    Hit: 46  Date: 2012-9-26
To fully answer five questions of SMD diodes

Reverse-blocking diode, can withstand a certain amount of back pressure, back pressure is the maximum tolerable rated voltage。 Instance a 5A/100V the diode, its rated back pressure is 100V. All diode manufacturers will remain a certain margin diode of 100 V is usually used 110V it will not matter, but it is not recommended so exceeds the rated, manufacturers can not guarantee the reliability, the problem is that you problems. And many power design company, in order to protect the reliability, but also derating design。

  1. What is the impact current diode forward?
Switching power supply in the boot or other transient case, you need to patch diode capable of withstanding great impact on current rather than bad, this inrush current should of course is not repetitive or long interval. Usually diode data sheet has to define the impact of current, inrush current of the test conditions is often a single waveform, such as a single sine wave or square wave. Its current value is often up to a few hundred.

  2. What is the forward voltage drop of the diode?
The diode produces a voltage drop at forward conduction, the current flowing when。 This voltage drop, and the forward current, as well as temperature. Usually a silicon diode, the greater the current, the greater the pressure drop。 The higher the temperature, the smaller the pressure drop。 However, the silicon carbide diodes are higher the temperature, the greater the pressure drop。

  3. What is the reverse leakage current of the diode?
Diode reverse blocking when not entirely satisfactory cutoff. Withstand anti-presses when some tiny current to the anode from the cathode drain. This current is typically very small, and the higher the back pressure, the greater the leakage current, the higher the temperature, the greater the leakage current。 The large leakage current will bring a large loss, particularly in high pressure applications.

  4. Diode is conducting when the transient process like?
Transient process for diode reverse recovery characteristics, are usually concerned more. But in fact, the diode forward conduction from the anti-deflection also notable places. SMD diode conduction just forward voltage drop will be increased to a maximum, before declining to a steady-state value. This maximum is increased with the increase in the di / dt. That diode with conduction instantly generated a positive peak voltage, and the voltage is greater than the steady-state voltage. Positive peak voltage fast recovery tube is relatively small, slow recovery pipe will be very serious. This leads to another question:

  5. RCD clamp circuit, the diode in the end choose slow pipe, tube or fast?
The RCD circuit is commonly used in the need to clamp the occasion, such as the flyback primary side MOS voltage clamp, rectifier voltage clamp。 Some technical literature that should slow recovery tube, the reason is the slow recovery tube due to its reverse recovery time is relatively long, part of the energy so that the clamp capacitor SMD diode reverse recovery process back to the circuit, so that the entire RCD circuit the loss can be reduced. However, this is only suitable for small current, low di / dt occasions。 Such as low-power flyback primary side clamp circuit. But is not suitable for high-current, high di / dt clamp occasions, such as high-current output of the secondary power clamp circuit. Because slow recovery tube spike conduction will produce high conduction voltage drop, leading to the clamp capacitor voltage is low, but no law to clamp the voltage spike. So should choose the class of the Schottky diode.

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