Sanyo IDC-1000ZE Service Manual page 14

Digital disc camera
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3-3. PW1 POWER CIRCUIT DESCRIPTION
1. Outline
This is the PW1 power circuit for camera block. The oscilla-
tion frequency is 400 kHz, and it has no voltage adjustment.
1-1. IC501 and IC511
This is necessary for controlling the power supply for a PWM-
type switching regulator, and IC501 is provided with four built-
in channels step-down circuits. IC511 is provided with trans-
former control and step-up circuit for backlight. The oscilla-
tion frequency is approx. 200 kHz.
1-2. Short-circuit protection circuit
If output is short-circuited for the length of time (approx. 120
ms) determined by the condenser which are connected to
Pin (17) of IC501 and Pin (17) of IC511, all output is turned
off. The control signal (P ON) are recontrolled or reset on the
power to restore output.
1-3. Head 4 V Power Output
IC501 CH1 is output. It is used for head power supply of disc.
Feedback for output voltage is provided to Pin (29) of IC501
so that PWM control can be carried out.
1-4. Digital 3.3 V System Power Output
IC501 CH2 is output. It is used for digital circuit power supply
of camera. Feedback for output voltage is provided to Pin
(26) of IC501 so that PWM control can be carried out.
1-5. Digital 2.4 V System Power Output
IC501 CH3 is output. It is used for core power supply of cam-
era ASIC. Feedback for output voltage is provided to Pin (11)
of IC501 so that PWM control can be carried out.
1-6. Motor 5 V Power Output
IC501 CH4 is output. It is used for lens circuit power supply.
Feedback for output voltage is provided to Pin (7) of IC501
so that PWM control can be carried out.
1-7. CCD Power Output
IC511 CH1 is output. It is output CCD power supply (5.1 V
(A), 15.0 V (A), –8 V (A)) and digital 5.1 V (D) by transformer
T5101. Feedback for 5.1 V (D) is provided to Pin (29) of IC511
so that PWM control can be carried out.
1-8. LCD Panel Power Output
IC511 CH2 is output. It is output LCD panel power supply
(5.1 V (L), 12.4 V (L), 15 V (L)) by transformer T5102. Feed-
back for 5.1 V (L) is provided to Pin (26) of IC511 so that
PWM control can be carried out.
1-9. EVF Back Light Power Output
IC511 CH3 is output. It is output EVF backlight power supply.
The backlight is controlled constant current 15 mA. Output
voltage is approx. 11-14 V by LED VF is scattered.
1-10. LCD Back Light Power Output
IC511 CH4 is output. It is output EVF backlight power supply.
The backlight is controlled constant current 8.3 mA. Output
voltage is approx. 20-24 V by LED VF is scattered.
– 14 –

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