SANYO VPC-MZ2EX, VPC-MZ2, VAR-GA4U, VAR-GA4EX, VAR-GA4E POWER CIRCUIT DESCRIPTION

1-4. PW1 POWER CIRCUIT DESCRIPTION

1. Outline

This is the main PW1 power circuit, and is comprised of the
following blocks.
Switching controller (IC501)
Digital and LCD system and 5.0 V system power output
(L5005, Q5015, D5005, C5036, C5037)
Digital 3.3 V system power supply (L5002, Q5003, D5002,
C5018)
Digital 3.4 V system power supply (L5003, Q5009, D5004,
C5029)
Series regulator (IC502)
Digital 2.5 V system power supply (Q5007, C5025, C5026)
Analog system 5 V power supply (L5008, Q5020, D5006,
C5045)

2. Switching Controller (IC501)

This is the basic circuit which is necessary for controlling the
power supply for a PWM-type switching regulator, and is pro­vided with four built-in channels, only CH1 (digital 3.3 V), CH3
(5 V system), CH2 (digital 3.4 V) and CH4 (analog system 5
V) are used. Feedback from 3.3 V (D) (CH1), 3.4 V (D) (CH2),
5 V (D) (CH3) and 5.0 V (A) power supply outputs are re­ceived, and the PWM duty is varied so that each one is main­tained at the correct voltage setting level.

2-1. Short-circuit protection circuit

If output is short-circuited for the length of time determined
by the condenser which is connected to Pin (33) of IC501, all
output is turned off. The control signal (P ON, P(A) ON and
LCD ON) are recontrolled to restore output.

3. Digital 3.3 V Power Output

3.3 V (D) is output. Feedback for the 3.3 V (D) is provided to
the switching controller (Pins (1) of IC501) so that PWM con­trol can be carried out.

4. Digital 3.4 V System Power Output

3.4 V (D) is output. Feedback is provided to the swiching con­troller (Pin (12) of IC501) so that PWM control can be carried
out.

5. 5 V System Power Output

5 V (D) and 5 V (L) are output. Feedback for the 5 V (D) is
provided to the switching controller (Pin (25) of IC501) so
that PWM control can be carried out.

6. Series Regulator (IC502)

This is provided with one built-in channel. Digital 3.4 V is in­put, and digital 2.5 V is output.

7. Digital 2.5 V System Power Output

2.5 V (D) is output. Feedback for the 2.5 V (D) is provided to
the Pin (7) of IC502. The current of Q5008 base is controled
so that the voltage of Q5008 collector is 2.5 V.

8. Analog 5 V System Power Output

5 V (A) is output. Feedback is provided to the swiching con­troller (Pin (36) of IC501) so that PWM control can be carried
out.

– 7 –

1-5. PW1 STROBE CIRCUIT DESCRIPTION

1. Charging Circuit

When UNREG power is supplied to the charge circuit and the
CHG signal becomes High (3.3 V), the charging circuit starts
operating and the main electorolytic capacitor is charged with
high-voltage direct current.
However, when the CHG signal is Low (0 V), the charging
circuit does not operate.

1-1. Power switch

When the CHG signal switches to Hi, Q5406 turns ON and
the charging circuit starts operating.

1-2. Power supply filter

L5401 and C5401 constitute the power supply filter. They
smooth out ripples in the current which accompany the switch­ing of the oscillation transformer.

1-3. Oscillation circuit

This circuit generates an AC voltage (pulse) in order to in­crease the UNREG power supply voltage when drops in cur­rent occur. This circuit generates a drive pulse with a frequency
of approximately 50-100 kHz. Because self-excited light omis­sion is used, the oscillation frequency changes according to
the drive conditions.

2. Light Emission Circuit

When RDY and TRIG signals are input from the ASIC expan­sion port, the stroboscope emits light.

2-1. Emission control circuit

When the RDY signal is input to the emission control circuit,
Q5409 switches on and preparation is made to let current
flow to the light emitting element. Moreover, when a STOP
signal is input, the stroboscope stops emitting light.

2-2. Trigger circuit

When a TRIG signal is input to the trigger circuit, D5405
switches on, a high-voltage pulse of several kilovolts is gen­erated inside the trigger circuit, and this pulse is then applied
to the light emitting part.

2-3. Light emitting element

When the high-voltage pulse form the trigger circuit is ap­plied to the light emitting part, currnet flows to the light emit­ting element and light is emitted.

Beware of electric shocks.

1-4. Oscillation transformer

The low-voltage alternating current which is generated by the
oscillation control circuit is converted to a high-voltage alter­nating current by the oscillation transformer.

1-5. Rectifier circuit

The high-voltage alternating current which is generated at
the secondary side of T5401 is rectified to produce a high­voltage direct current and is accumulated at electrolytic ca­pacitor C5144 on the CA3 board.

1-6. Voltage monitoring circuit

This circuit is used to maintain the voltage accumulated at
C5144 at a constance level.
After the charging voltage is divided and converted to a lower
voltage by R5417 and R5419, it is output to the SY1 circuit
board as the monitoring voltage VMONIT. When this VMONIT
voltage reaches a specified level at the SY1 circuit board, the
CHG signal is switched to Low and charging is interrupted.

– 8 –

1-6. SY1 CIRCUIT DESCRIPTION

1. Configuration and Functions

For the overall configuration of the SY1 circuit board, refer to the block diagram. The SY1 circuit board centers around a 8-bit
microprocessor (IC301), and controls camera system condition (mode).
The 8-bit microprocessor handles the following functions.

1. Operation key input, 2. Clock control and backup, 3. Power ON/OFF, 4. Storobe charge control, 5. Signal input and output for
zoom and lens control.

Pin

1~4

5

6

7

8

9

10

11

12
13

14

15

16

17

18

19

20

21

22

23

24 VDD

25 AVSS

26~29 SCAN IN 3~0

30

31 DC IN

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

STBY_LED (GREEN)

Signal

SCAN OUT 0~3

P ON

PA ON

LCD ON

P ON2

VSS

VDD

SELF_LED

STBY_LED (RED)

AVREF_ON

SI

SO

SCK

PRG SI

PRG SO

PRG SCK

AV J AC K

NOT USED

CHG ON

INT_TMP

CHG VOL

BATTERY

AVREF

AVDD

RESET

XCOUT

XCIN

IC

XOUT

XIN

VSS

BAT OFF

SREQ

JOG 0

SCAN_IN5

JOG 1

BR PCON

I/O

O

O

O

O

O

O

O

O

O

O

I/O

O

I/O

O

O

O

O

Outline

Key matrix output

Digital power ON/OFF control H : ON

Analog power ON/OFF control H : ON

LCD power ON/OFF control H : ON

ASIC/CF card power timing control H : ON

-

-

I

I

I

-

-

-

I

I

I

I

I

-

-

I

I

I

I

-

I

I

I

I

I

GND

VDD

Self-timer LED control L : ON

Stand-by LED (green) control L : ON

Stand-by LED (red) control L : ON

A/D converter standard voltage control L : ON

Receiving data (from ASIC)

Sending data (to ASIC)

Communication clock (to ASIC)

Flash memory write receiving data

Flash memory write sending data

Flash memory write communication clock

AV jack connection detection H : AV JACK detection

-

Flash charge control H : ON

VDD

Analog GND

Key scan input

Internal temperature detection input (analog input)

DC JACK/battery detection input (analog input)

Storobe charge voltage detection (analog input)

Battery voltage detection (analog input)

Analog standard voltage input terminal

A/D converter analog power terminal

Reset input

Clock oscillation terminal (32.768 kHz)

Clock oscillation terminal

Flash memory writing voltage

Main clock oscillation terminal (4MHz)

Main clock oscillation terminal

GND

Battery OFF detection

Serial communication requirement (from ASIC)

Jog shuttle input 0

Key scan input 5

Jog shuttle input 1

-

See next page →

– 9 –

49 BR OPEN

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

BR CLOSE

CARD

BUZZER

SCAN IN 4

SCAN OUT 4

WAKE UP

SYMUTE

USB

NOT USED

NOT USED -

NOT USED

NOT USED

ASIC TEST 1 O ASIC reset control signal 1

ASIC TEST 2

ASIC RESET

O

O Barrier close control L : Close

I

O

I

O

I

O

I

--

-

-

O

O

Table 4-1. 8-bit Microprocessor Port Specification

Barrier open control H : Open

CF card insertion detection L : Insertion

Buzzer beep tone output H : Pulse output

Key scan input 4

Key scan output 4

-

Audio mute control L : Mute

USB connector detection L : USB detecion

-

-

-

ASIC reset control signal 2

ASIC reset singal

2. Internal Communication Bus

The SY1 circuit board carries out overall control of camera operation by detecting the input from the keyboard and the condition
of the camera circuits. The 8-bit microprocessor reads the signals from each sensor element as input data and outputs this data
to the camera circuits (ASIC) or to the LCD display device as operation mode setting data. Fig. 4-1 shows the internal commu­nication between the 8-bit microprocessor, ASIC and SPARC lite circuits.

ASIC RESET

S. REQ

8-bit

Microprocessor

Fig. 4-1 Internal Bus Communication System

ASIC SO

ASIC SI

ASIC SCK

ASIC TEST 1

ASIC TEST 2

3. Key Operaiton

For details of the key operation, refer to the instruction manual.

SCAN

SCAN
OUT

IN

0

1

2

3

4

0

← LEFT

TELE

MODE

STILL IMAGE

--

123

↑ UP

WIDE

SET FLASH MODE BARRIER OPEN

SEQUENTIAL

SHOT

→ RIGHT

PLAY MODE

INFO

VIDEO CLIP

SHOOTING

-

↓ DOWN

REC MODE

(LCD OFF)

SET UP

-

4

1st shutter

REC MODE

(LCD ON)

PC MODE

-

ASIC

5

2nd shutter

-

BARRIER

CLOSE

TEST

POWER ON

Table 4-2. Key Operation

– 10 –

4. Power Supply Control

The 8-bit microprocessor controls the power supply for the overall system.
The following is a description of how the power supply is turned on and off. When the battery is attached, a regulated 3.2 V
voltage is normally input to the 8-bit microprocessor (IC301) by IC302, so that clock counting and key scanning is carried out
even when the power switch is turned off, so that the camera can start up again. When the battery is removed, the 8-bit micro­processor operates in sleep mode using the backup capacitor. At this time, the 8-bit microprocessor only carries out clock
counting, and waits in standby for the battery to be attached again. When a switch is operated, the 8-bit microprocessor supplies
power to the system as required.
The 8-bit microprocessor first sets both the P (A) ON signal at pin (6) and the P ON signal at pin (5) to high, and then turns on the
DC/DC converter. After this, low signals are output from pins (62), (63) and (64) so that the ASIC is set to the active condition. If
the LCD monitor is on, the LCD ON signal at pin (7) set to high, and the DC/DC converter for the LCD monitor is turned on. Once
it is completed, the ASIC returns to the reset condition, all DC/DC converters are turned off and the power supply to the whole
system is halted.

ASIC,

memory

Power voltage

Power OFF

Power switch ON-

Auto power OFF

Shutter switch ON

CAMERA

Monitor OFF

LCD finder

Play back

Table 4-3. Camera Mode (Battery Operation)

Note) 4 MHz = Main clock operation, 32 kHz = Sub clock operation

3.3 V

OFF

OFF

ON

OFF

ON

ON

CCD

5 V (A)

+12 V etc.

OFF

OFF

ON→OFF

OFF

ON

OFF

8 bit

CPU

3.2 V

(ALWAYS)

32KHz OFF

4 MHz OFF

4 MHz OFF

4 MHz OFF

4 MHz ON

4 MHz ON

MONITOR

+12V etc.

LCD

5V (L)

– 11 –