om5428 ETC-unknow, om5428 Datasheet - Page 10

• Manufacturer Part Number: om5428
• Description: General Purpose Triggering Circuit
• Manufacturer: ETC-unknow

crossings of the mains voltage as long as the voltage produced by the temperature bridge connected to IC+ (pin 5) is higher than the voltage on
IC (pin 6). The voltage on IC is a sawtooth with a repetition time of approximately 30 s; this time is determined by the RC network formed by
Fig.4 Typical application of the OM5428 as a time proportional temperature controller. The arrangement gives triggering around the zero
R3 and C2. The values shown for Rs, Rg, Rz and C1 give a gate current I
Active
Neutral
C1
220 F
16V
230
Vac
NTC
100KΩ
R2
168K
VR1
50KΩ
lin
θ
R4
1MΩ
Rz
500K
VR25
R1
1M
t
w
DIFFEN
XOUT
= 100 s typical.
SDIS
QC+
QC-
PW
IC+
IC-
1
2
3
4
5
6
7
8
OM5428
GT
= 50 mA typical at V
16
14
13
15
12
11
10
9
VEE
XDIS
FLY
SAW
RMNS
VCC
TRIG
AMPIN
GT
R3
750K
C2
100 F
16V
= 1.5 V and a trigger pulse duration
Rs
100K
VR37
LOAD
T1
Triac
Rg
250