![background image](http://html.mh-extra.com/html/sii/ltp3445/ltp3445_technical-reference_1269762032.webp)
2-21
TC98KS-T1 (125
µ
m paper)
1.3
J & N tack HW74
1.3
TW80KK-S (2-ply paper)
2.6
2
TCC (2-ply paper)
2.6
2
T
C
: Temperature coefficient
2-ply thermal paper
0.00448
Recommended thermal paper (except for 2-ply thermal paper)
0.00352
1
The thermistor resistance value at T
X
(
°
C). Refer to Section 2.6.7.
2
For driving for 2-ply thermal paper, refer to Section 2.6.8.
2.6.3 Adjustment of the Head Activation Voltage
Adjustment of the head activation pulse width because of changing the head activation voltage is
according to equation (5). The adjustment method is different if the head drive voltage (V
P
) is over 6 V or
under 6 V.
Equation 5:
V=V
P
- 0.9 (over 5 V)
V=V
P
×
1.26 - 2.46 (under 5 V)
V
P
: Head activation voltage (V)
2.6.4 Adjustment of the Head Resistance
Adjustment of the head resistance is according to equation (6). Due to wiring resistance there is a drop
in voltage.
Equation 6:
RH:Head resistance
rank B
(162 - 178
Ω
)
178 (
Ω
)
rank C
(145 - 161
Ω
)
161 (
Ω
)
60: Wiring resistance in the thermal head (
Ω
)
R
C
: Common terminal wiring resistance in the thermal head 0.1 (
Ω
)
rc: Wiring resistance between V
P
and GND (
Ω
)
1
N: Number of dots driven at the same time
1
This resistance is the resistance of the wire used between the FPW terminal of thermal head, the power supply, the
resistance of switching circuit of relay, etc.
( RH + 60 + (R
C
+ rc )
×
N )
2
R =
RH
Summary of Contents for LTP3445
Page 2: ......
Page 5: ...iv ...
Page 43: ...2 32 ...
Page 61: ...6 2 Figure 6 1 LTP3445 Appearance and Dimensions ...
Page 69: ...8 6 ...