Sanyo VPC-HD1000 Service Manual

Also see for VPC-HD1000BK: Quick manual

Contents

– 6 –1-3. PWA POWER CIRCUIT DESCRIPTION1. OutlineThis is the main power circuit, and is comprised of the follow-ing blocks.Switching controller (IC501)Motor system power output (L5301)Digital 3.25 V power output (L5004)Digital and CMOS I/O 1.8 V power output (L5005)Blue LED power output (Q5013, L5011)Backlight power output (Q5009, L5007)Digital 1 V power output (IC503, L5008)CMOS analog 3 V power output (IC505)CMOS digital 1.8 V power output (IC504, L5009)Charge circuit (IC521)2. Switching Controller (IC501)This is the basic circuit which is necessary for controlling thepower supply for a PWM-type switching regulator, and is pro-vided with seven built-in channels, only CH1 (motor system),CH2 (digital 3.25 V), CH3 (digital 1.8 V), CH5 (blue LED) andCH7 (backlight) are used.Each power supply output is received, and the PWM duty isvaried so that each one is maintained at the correct voltagesetting level.Feedback for the blue LED (CH5) and the backlight power(CH7) is provided to the both ends voltage of registance sothat regular current can be controlled to be current that wassetting.2-1. Short-circuit protection circuitIf output is short-circuited for the length of time determinedby the condenser which is connected to Pin (1) of IC501, alloutput is turned off. To reset, momentarily set the control sig-nal (P ON) to repeat control, or temporarily disconnect theinput power supply.3. Motor System Power OutputBOOST 5 V and USB_5V are output. Feedback for the 5 Voutput is provided to the switching controller (Pin (36) of IC501)so that PWM control can be carried out.4. Digital 3.25 V Power OutputVDD3 is output. Feedback for the VDD3 is provided to theswiching controller (Pin (45) of IC501) so that PWM controlcan be carried out.5. Digital 1.8 V and CMOS 1.8 V (I/O) Power OutputVDD 1.8 and +1.8 V (I/O) are output. Feedback for the 1.8 Vis provided to the switching controller (Pin (44) of IC501) sothat PWM control to be carried out.6. Blue LED Power Supply outputRegular current is being transmitted to blue LED. Feedbackfor the both ends voltage of registance that is being positionedto in series blue LED are provided to the switching controller(Pin (39) of IC501) so that PWM control to be carried out.7. Backlight Power Supply outputRegular current is being transmitted to LED for LCD back-light. Feedback for the both ends voltage of registance that isbeing positioned to in series LED are provided to the switch-ing controller (Pin (42) of IC501) so that PWM control to becarried out.8. Digital 1 V Power OutputVDD 1.0 is output. Feedback for the VDD 1.0 is provided tothe switching controller (Pin (11) of IC503) so that PWM con-trol to be carried out.9. CMOS Analog 3 V Power Output+3.0 V (A) is output. +3.0 V (A) is output to drop 3.0 V byregulator IC505 from 3.25 V power output.10. CMOS Digital 1.8 V Power Output+1.8 V (D) is output. Feedback for the +1.8 V (D) is providedto the switching controller (Pin (3) of IC504) so that PWMcontrol to be carried out.11. Camera charging circuitIf the camera’s power is turned off, power save mode andsleep mode setting while it is connected to the AC adaptor,the battery will be recharged. In the above condition, a CTLsignal is sent from the microprocessor and recharging starts.