AC16FSM datasheet(156/223 Pages) TECCOR

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AN1006

Application Notes

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AN1006 - 4

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Power Rectifiers

The rectifier is a unidirectional device which conducts when for-

ward voltage (above 0.7 V) is applied.

To connect the rectifier:

1. Connect Anode to Collector Terminal (C).

2. Connect Cathode to Emitter Terminal (E).

To begin testing, perform the following procedures.

Procedure 1: VRRM and IRM

To measure the VRRM and IRM parameter:

1. Set Variable Collector Supply Voltage Range to 1500 V.

(2000 V on 370)

2. Set Horizontal knob to sufficient scale to allow viewing of

trace at the required voltage level (100 V/DIV for 400 V and

600 V devices and 50 V/DIV for 200 V devices).

3. Set Mode to Leakage.

4. Set Vertical knob to 100 µA/DIV. (Due to leakage setting, the

CRT readout will be 100 nA per division.)

5. Set Terminal Selector to Emitter Grounded-Open Base.

6. Set Polarity to (–).

7. Set Power Dissipation to 2.2 W. (2W on 370)

8. Set Left-Right Terminal Jack Selector to correspond with

location of test fixture.

9. Increase Variable Collector Supply Voltage to the rated

VRRM of the device and observe the dot on the CRT. Read

across horizontally from the dot to the vertical current scale.

This measured value is the leakage current.

(Figure AN1006.2)

Figure AN1006.2

IRM = 340 nA at VRRM = 600 V

Procedure 2: VFM

Before testing, note the following:

•

A Kelvin test fixture is required for this test. If a Kelvin fixture is

not used, an error in measurement of VFM will result due to

voltage drop in fixture. If a Kelvin fixture is not available,

Figure AN1006.3 shows necessary information to wire a test

fixture with Kelvin connections.

•

Due to the current limitations of standard curve tracer

model 576, VFM cannot be tested at rated current without a Tek-

tronix model 176 high-current module. The procedure below is

done at IT(RMS) = 10 A (20 APK). This test parameter allows the

use of a standard curve tracer and still provides an estimate of

whether VFM is within specification.

Figure AN1006.3

Instructions for Wiring Kelvin Socket

To measure the VFM parameter:

1. Set Variable Collector Supply Voltage Range to 15 Max

Peak Volts. (16 V on 370)

2. Set Horizontal knob to 0.5 V/DIV.

3. Set Mode to Norm.

4. Set Vertical knob to 2 A/DIV.

5. Set Power Dissipation to 220 W (100 W on 577).

6. Set Polarity to (+).

7. Set Left-Right Terminal Jack Selector to correspond with

location of test fixture.

8. Increase Variable Collector Supply Voltage until current

reaches 20 A.

WARNING: Limit test time to 15 seconds maximum.

To measure VFM, follow along horizontal scale to the point where

the trace crosses the 20 A axis. The distance from the left-hand

side of scale to the crossing point is the VFM value.

(Figure AN1006.4)

Note: Model 370 current is limited to 10 A.

VRRM

IRM

100

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

SOCKET

SOCKET PINS

One set of

pins wired to

Collector (C),

Base (B), and

Emitter (E)

Terminals

The pins which correspond to

the anode and cathode of the

device are wired to the terminals

marked CSENSE (MT2/Anode) and

ESENSE (MT1/Cathode). The gate

does not require a Kelvin

connection.

Socket used

must have two

sets of pins

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