SDB0900E70 Datasheet, PDF (6/6 Pages) Suntac Electronic Corp. – silicon bilateral voltage triggered switch

Sidac
Data Sheets
(a) Circuit
VDC(IN) ≥ VB0
R
SIDAC
VC
VBO
VC
(b) Waveforms
t
C
IL
RL
IL
Rmax ≤
VIN - VBO
IBO
t
Rmin _≥
VIN - VTM
IH _(MIN)
Figure E9.15 Relaxation Oscillator Using a Sidac
Input
(See Note B)
2N6127
(or equivalent)
R_{BB1 =}
150 Ω
50 Ω
50 Ω
R_{BB2 =}
100 Ω
V_BB1 =10 V
+ ^VBB2 ⁼⁰
-
Test Circuit
V_CE Monitor
TIP-47
100 mH
+
V_CC = 20 V
-
R_S = 0.1 Ω
I_C Monitor
Input
Voltage
0V
5V
Collector
Current
0.63 A
0
Sidac V_BO
t_w ≈ 3 ms
(See Note A)
t_w
100 ms
Collector
Voltage
10 V
V_CE(sat)
Voltage and Current Waveforms
Note A: Input pulse width is increased until I_CM = 0.63 A.
Note B: Sidac (or Diac or series of Diacs) chosen so that V_BO is just below V_CEO 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.
Figure E9.16 Sidac Added to Protect Transistor for Typical Transistor Inductive Load Switching Requirements
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