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Verfügbare Sprachen
Verfügbare Sprachen
4. POWER CIRCUIT
1-1. Outline
witching regulator system is adopted in order to make the unit compact, light, and efficient. The output volt-
ige is 5V, 9V, 17V, and - 13V, and Capstan Motor power source (PWM output) and Drum Motor power source
PWM output) are available. The circuits to which battery voltage 9.6V is directly inputted are system control-
er circuit (system controller 50 Reg), loading motor power source, and camera part (such as a zoom motor). In
iddition, 8.5V series regulator is available as a sensor power source.
1-2. Description of circuit
|. TL1451 ACNS (1C901)
1) See block diagram 4-1,
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Figure 4-1. Block Diagram of TL1451
2) Description of function
(a) Reference voltage part
P-con 9.6V (9-11.5V) applied by the Vcc (pin (9)) terminal composes a temperature-compensated.
reference voltage power source of 2.5V, which is used as an operation power source for the ana-
logue circuit within the IC. it is also taken out through the Vref (pin (16)) terminal, creating 1.25V in
the resistance divider, which is used as a reference voltage of the comparator.
(b) Chopping wave oscillator
Ry (pin (2)) terminal to generate a chopping wave oscillation waveform of approx. 200 kHz, whose
voltage amplification is between 1.4 and 2.0V.
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