AC16FSM datasheet(92/223 Pages) TECCOR

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Sidac

Data Sheets

Figure E9.15 Relaxation Oscillator Using a Sidac

Figure E9.16 Sidac Added to Protect Transistor for Typical Transistor Inductive Load Switching Requirements

DC(IN) ≥

SIDAC

(a) Circuit

max ≤

- V

min ≥

- V

H (MIN)

(b) Waveforms

VCE Monitor

100 mH

IC Monitor

RS = 0.1 Ω

Test Circuit

VBB1 =10 V

VBB2 =0

RBB2 =

100

Ω

RBB1 =

150

Ω

2N6127

(or equivalent)

Ω

Input

(See Note B)

TIP-47

VCC = 20 V

Voltage and Current Waveforms

Input

Voltage

0 V

5 V

0.63 A

Sidac VBO

10 V

VCE(sat)

tw ≈ 3 ms

(See Note A)

Collector

Current

Collector

Voltage

100 ms

Note A: Input pulse width is increased until ICM = 0.63 A.

Note B: Sidac (or Diac or series of Diacs) chosen so that VBO is just below VCEO rating of transistor to be protected.

The Sidac (or Diac) eliminates a reverse breakdown of the transistor in inductive switching circuits where otherwise the

transistor could be destroyed.

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