LTPH245 datasheet(33/64 Pages) SII

Part #	LTPH245

Description	LINE THERMAL PRINTER MECHANISM TECHNICAL REFERENCE

PDF	64 Pages

Scroll/Zoom	100%

Manufacturer	SII [Seiko Instruments Inc]

Direct Link	http://www.sii.co.jp

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33 / 64 page

3-20

3.6.3

Calculation of Head Activation Voltage

Calculate the applied voltage using equation (5).

Equation (5):

V=Vp

× 0.98 - 1.26

Vp: Head activation voltage (V)

3.6.4

Calculation of Head Resistance

A drop in voltage occurs depending on the wiring resistance.

Calculate the head resistance using

equation (6).

Equation (6):

RH: Head resistance depending on resistance ranks

rank A (178.6 - 195.5

Ω):

195.5 (

Ω)

rank B (161.6 - 178.5

Ω):

178.5 (

Ω)

rank C (144.5 - 161.5

Ω):

161.5 (

Ω)

25: Wiring resistance in the thermal head (

Ω)

RC: Common terminal wiring resistance in the thermal head:

0.2 (

Ω)

rC:

Wiring resistance between VP and GND (

Ω) 1

Number of dots driven simultaneously

It indicates a series resistance of wire and relay switching circuits used between the FFC terminals and power

supply.

( RH + 25 + (RC + rC )

× N ) 2



LTPH245 Datasheet(PDF) 33 Page - Seiko Instruments Inc

LTPH245 Datasheet(HTML) 33 Page - Seiko Instruments Inc

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