UV TRON
®
DRIVING CIRCUIT C3704 SERIES
Figure 2: Schematic Diagram
UV TRON
(SOLD SEPARATELY)
ANODE
CATHODE
Q
A
+5Vdc
+
POWER SUPPLY
–
GND
* Not included in C3704-02.
CONSTANT *
VOLTAGE
CIRCUIT
+350Vdc
HIGH VOLTAGE
DC-DC
CONVERTER
SIGNAL
PROCESSING
CIRCUIT
3 5 7 9
Q (1)
Q (2)
K
OUTPUT SIGNAL
WAVEFORM
Q
5V
GND
5V
GND
10 ms
(Note 4)
OPEN COLLECTOR
OUTPUT (3)
Tr : 50
•
100mA
JUMPER LEAD FOR SETTING
BACKGROUND CANCEL LEVEL
TPT C0004EA
Figure 3: Method of Connection
v
POWER SUPPLY INPUT AND SIGNAL OUTPUT POINT
–
: GND
+
: POWER SUPPLY INPUT
1 : SIGNAL OUTPUT Q
2 : SIGNAL OUTPUT Q
3 : OPEN COLLECTOR OUTPUT
v
(Note 3)
JUMPER LEAD FOR SETTING
BACKGROUND CANCEL LEVEL
This background cancel circuit outputs signal pulses
of 10ms width only when 3 to 9 pulses enter the
circuit with a time interval of 2 seconds or less from
the UV TRON. Cancel level can be set in 4 steps
(number of pulses: 3, 5, 7, 9) by this jumper lead.
Connect to “3” for general use. When using where
much natural excitation light is present, set the
cancel level at a higher step (5, 7, 9).
v
Cx : POINT FOR ADDING A CAPACITOR TO
EXTEND OUTPUT PULSE WIDTH
(Note 4)
v
CONNECTING POINT OF UV TRON
A : Connecting Anode of UV TRON
K : Connecting Cathode of UV TRON
Note 3: No load can be driven by an output from points “1” and “2” because these signals are
output from the only C-MOS IC directly. When a load such as a buzzer and a relay is
connected to this circuit, it should be connected to the point open collector output. The
transistor ratings of the open collector is 50V, 100mA. Be careful not to exceed the ratings.
Note 4: The output pulse width is set to 10ms at shipping. If the pulse width needs to be
extended, add a capacitor to this point. (When using an electrolytic condenser, make
sure the polarity is correct.)
e.g. CX = 1
µF:
Pulse Width 1s, CX=10
µF
: Pulse Width 10s
PRECAUTIONS FOR USE
q
q
q
Since the operation impedance is extremely high, the UV TRON should be connected as close as possible to the circuit
board within 5 cm.
Take care to avoid external noise since a C-MOS IC is used in the circuit. It is recommended that the whole PC board be put
in the shield box when it is used.
To reduce current consumption, oscillating frequency is very low (approx. 20 Hz) in this DC-DC converter. Thus, the output
impedance of the high voltage power supply is extremely high. If the surrounding humidity is high, electrical leakage on the
PC board surface may lead to a drop in the supply voltage to the UV TRON. This voltage drop may result in lowered detec-
tion performance, so a moistureproof material (silicone compound, etc.) should be applied at the connecting point of the
UV TRON, etc., if using the unit in a humid environment.
q
A model equipped with a flame sensor (R2868) is also available.
HAMAMATSU PHOTONICS K.K., Electron Tube Center
314-5, Shimokanzo, Toyooka-village, Iwata-gun, Shizuoka-ken, 438-0193, Japan, Telephone: (81)539/62-5248, Fax: (81)539/62-2205, Telex: 4225-186HAMAHQ
U.S.A.:
Hamamatsu Corporation: 360 Foothill Road, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1)908-231-0960, Fax: (1)908-231-1218
Germany:
Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658
France:
Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: (33)1 69 53 71 00, Fax: (33)1 69 53 71 10
United Kingdom:
Hamamatsu Photonics UK Limited: Lough Point, 2 Gladbeck Way, Windmill Hill, Enfield, Middlesex EN2 7JA, United Kingdom, Telephone: (44)181-367-3560, Fax: (44)181-367-6384
North Europe:
Hamamatsu Photonics Norden AB: Färögatan 7, S-164-40 Kista, Sweden, Telephone: (46)8-703-29-50, Fax: (46)8-750-58-95
Italy:
Hamamatsu Photonics Italia S.R.L.: Via Della Moia, 1/E 20020 Arese, (Milano), Italy, Telephone: (39)2-935 81 733, Fax: (39)2-935 81 741
TPT1007E01
JUL.1997 CR
Created in Japan
HAMAMATSU [ HAMAMATSU CORPORATION ]
