Schottky diode detection
Schottky diode (Schottky) is also called the Schottky diode (hereinafter referred to as SBD), it is a kind of low power consumption, ultra-high speed semiconductor devices, which are widely used in switching power supply, inverter, such as drive circuit, high frequency, low pressure, large current rectifier diode, fly-wheel diode, protecting diode is used, or in microwave communication and other circuit in the rectifier diode, small signal detection diode use.
1, performance comparison
Schottky diode is super fast recovery diodes, fast recovery rectifiers, silicon high frequency rectifier diode, silicon high speed switch diode performance comparison. Table shows, silicon high speed switch the diode TRR is very low, but the average rectifier current is small, cannot be big current rectifier with.
2, detection method
Below through an example to introduce the method of detecting schottky diode. Detection contents include: (1) identify electrode; (2) the inspection pipe unidirectional conductivity; (3) test is the wizard pressure drop VF; (4) measurement reverse breakdown voltage VBR.
Measured tube for B82-004 type schottky tube, a total of three pin, the contour as shown in figure 4 shows, in accordance with the tube feet from left to right order plaits of serial number (1), (2), (3). Choose the type 500 multimeter R x 1 file measurement.
Test conclusion:
First, according to (1); (2), (3);(4) all can measure between positive resistance, decision measured tube for common Yin pipe, (1), (3) for foot two anode, (2) the feet for public cathode.
Second, because (1); (2), (3);(2) the positive resistance between only a few ohms, and reverse resistance to infinity, it has unilateral electrical conductivity.
Third, internal two schottky diode positive guide through pressure drop were 0.315 V, 0.33 V, are less than manual given the maximum allowable value of m VFM (0.55 V).
In addition, use of ZC25-3 type megohmmeter and 500 multimeter 250 VDC file measure, internal two tube of the reverse breakdown voltage VBR in turn for 140 v, 135 v. Check the manual, B82-004 the highest reverse working voltage (namely peak reverse voltage) VBR = 40 v. Leave that higher safety coefficient.
