Electrical Specifications

FIG.12 Relaxation Oscillator Using a SIDAC

(a) Circuit

SIDAC

R

(b) Waveforms

t

t

C

Rmax

Rmin

V-V

I

IN

BO

BO

V-V

I

IN

TM

H(MIN)

VV

DC(IN)

BO

INPUT

+

+

-

-

(See Note B)

R

=150

BB1

W

R =0.1

S

W

R

=100

BB2

W

V=0

BB2

V

=10V

BB1

V

=20V

CC

V

MONITOR

CE

I

MONITOR

C

TIP-47

100mH

0V

5V

0.63A

0

COLLECTOR

VOLTAGE

VOLTAGE AND CURRENT WAVEFORMS

NOTE A

NOTE B

: Input pulse width is increased until I

=0.63A.

: Sidac (or Diac or series of diacs) chosen so that V

is just below V

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.

CM

BO

CEO

TEST CIRCUIT

INPUT

VOLTAGE

T =3ms

(See Note A)

W

100mS

COLLECTOR

CURRENT

10V

50

W

50

W

2N6127

(or equivalent)

FIG.13 SIDAC Added To Protect Transistor For Typical Transistor Inductive Load Switching Requirements

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