tca280b Hendon Semiconductors, tca280b Datasheet - Page 13

• Manufacturer Part Number: tca280b
• Description: General Purpose Triggering Circuit
• Manufacturer: Hendon Semiconductors

AC mains
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 superimposed on a DC reference voltage. The sawtooth has a repetition time of approximately 30 s;
this time is determined by C2. The proportional band is determined by the amplitude of the sawtooth; this can be chosen by the value of R12.
V S
Fig.8 Typical application of the TCA280B as a time proportional temperature controller. The arrangement gives triggering around the zero
The values shown for R
− U
13
RX2
BYX10
SUPPLY
Rd
10 kΩ
(5.5 W)
DC
16
V EE
11
V CC
680 µF
(16 V)
C1
d
, R
ENZ
PW
R1
180 kΩ
(0.5 W)
G
12
1
and C1 give a gate current I
CROSSING
DETECTOR
ZERO-
15 kΩ
2
R 25
QZ
R2
o
C = 33 kΩ
18 kΩ
47 kΩ
R6
R4
R5
IC−
R9
33 kΩ
IC+
R10
33 kΩ
75 kΩ
6
5
GT
R3
DIFFERENCE
AMPLIFIER
= 100 mA typ. at V
3
RX1
R7
330 kΩ
4
7
QC−
QC+
R8
220 kΩ
R11
150 kΩ
330 kΩ
R12
G
= 2.5 V and a trigger pulse duration t
C2
220 µF
(16 V)
R13
220 kΩ
IS
14
GENERATOR
SAWTOOTH
120 kΩ
R14
15
QS
INHA
IA
8
9
AMPLIFIER
w
OUTPUT
= 160 s typ.
10
82 Ω
R G
QA
Fig-8-cct
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