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Ｔｏｎ＝Ｅｏ ÷ Ｐｏ

Ｐｏ＝Ｅｏ ÷ Ｔｏｎ

ＶＨ＝ √ （Ｐｏ ÷ Ｒａｖ） × （Rcom×Ｎ＋Rav＋Ric＋Rlead）

Rav:

Average resistance value

The number of simultaneous printing dot

Rcom:

Common resistance

Ric:

Driver-On resistance

Rlead:

Lead resistance

(5) Thermistor characteristics

B constant:

Resistance value R25:

Thermistor calculation formula: RX=R25×EXP{B×(1/TX-1/T25)} T: Absolute temperature

Operating temp. range:

Thermal time constant :

200

180

160

140

120

100

-20

(6) Cautions on operation

① When performing the continuous printing with high printing rate, regulate the head base

(thermistor) temperature so that it does not exceed the standard value.

② For the waiting time, control (circuit design) the printer so that VH (power supply of the

heating element) is turned off (the GND level) in order to prevent thermal head damages

caused by ions and noises.

③ When the thermistor is disconnected, control (circuit design) the printer so that the thermal

head is not overheated.

④ Do not input any pulse noise of equal or more than 2V, 20ns in each signal terminal.

⑤ Control signals of CLK, LAT, DIN, and STB with C -MOS (equivalent to 74HC240). In

addition, when the power supply is on/off and for the non-printing time, maintain the STB

signal in the "DISABLE" state.

⑥ Surge noise to prevent , the cable length of VH and GND shall be equal or shorter

than 100mm. Mount an aluminum electrolytic capacitor of 47 μ F between VH and GND

of the head side, which should be as close to the head side as possible. In addition, mount a

Date

Design

Inspection

Rev.

Design

3950K±2%

30KΩ±5% at25℃

-20〜+80℃

Within 30sec (in the air)

-10

Changes made

Inspect.

(example)

800

144 ［dot ］

(example)

0.05

50 ［ Ω ］

Temperature ［ ℃］

FTP-639MCL354 SPECIFICATION

A1NA02273-0354

FUJITSU COMPONENT LIMITED

Approv.

［ Ω ］

Submit to

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