Marquette Hellige GmbH MicroSmart V 2.xx Page 27
Servicing Instructions 227 470 35 B - 97.12
Voltage supply +24V
Switching
regulator
Uin
GND
GND
Uout
24V DC/DC converter
V500
T7
L504
Besides the logic supply, the thermal array needs a 24V power supply to current-activate the dots.
This 24V voltage is also used for the stepping motor. The voltage is generated by the switching
regulator MC33063. The switching regulator works in step-up operation in connection with the
external power MOSFET. For brief peak loads, the electrolytic storage capacitor supplies the
necessary power.
Input voltage 10V...16V
Output voltage +23.5 V ± 5%
Output current min. 0 mA, max. 600 mA
Efficiency 80%
To Next Page
Loading...