Star Micronics CBM-820 manual Drive circuit

7.2 Drive circuit

The recommended drive unit is shown below.

Drive output: 24V, 1.0A max.

F.G

1

2

With shield

TR1

D1

L1	Peripheral
	unit 1

M-GND

+24V

7824

3

4

TR2

M-GND

D2

5

	R3
L2	4.7kΩ
	1/4W

Peripheral unit 2

	+5V
TR3	R1	6
	R2

Compulsion switch

Frame ground

Printer side User side

Notes

•Peripheral Units 1 and 2 cannot be driven simultaneously.

•For continuous driving, do not use drive duty greater than 20%.

•Compulsion switch status is available as status data.

•Minimum resistance for coils L1 and L2 is 24Ω .

•Absolute maximum ratings for diodes D1 and D2 (Ta = 25° C) are: Average Rectified Current Io = 1A

Maximum forward surge current (60Hz, 1-cycle sine wave) IFSM = 40A

•Absolute maximum rating for transistors TR1 and TR2 (Ta = 25° C) are: Collector current Ic = 2A

Collector loss Pc = 1.2W

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