Sony NW-HD5 (serv.man2) Service Manual ▷ View online
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1-3. 3.3V/2.4V Generator Circuit
Fig.1-2 shows the 3.3V/2.4V generator circuit.
= 3.3V voltage =
The capacitor C9011 which is connected to Pin-33 of Power Control IC9003 is mounted for adjusting the output timing of Pin-34 of IC9003. This signal line becomes “H” in the
wake-up mode and “L” in the sleep mode. In this unit, this signal controls ON and OFF of 3.3V DC-DC CONVERTER IC9004.
When IC9003 is in the wake-up mode, CRST2 signal line becomes “H”. By this “H” signal, Q9009 turns “OFF” and “L” signal is input to Pin-1 [SHDN] of 3.3V DC-DC
CONVERTER IC9004. Then, IC9004 starts-up. When IC9004 starts up, IC9004 outputs the switching waveform from Pin-4 [SW]. Then, 3.3[V] is generated by the DC-DC
converter circuit composed of IC9004, L9003 and C9005. Then, the created voltage is supplied as the following 3 kinds of voltage.
3.3V voltage
3.3V_A voltage
3.3V_HDD voltage
= Mode Control of 3.3V DC-DC CONVERTER IC9004 =
3.3V DC-DC CONVERTER IC9004 has the lower power consumption mode and this mode is controlled by the signal output from pin-157[XHDD_PWR_CTL] of MULTI
INTERFACE IC7001. IC7001 outputs “H” signal when it recognizes that the following condition is satisfied.
= Condition that IC9004 enters the lower power consumption mode =
HDD drive is “OFF”
Table.1-8 Mode control of 3.3V DC-DC CONVERTER IC9004
IC7001 Pin-157 [XHDD_PWR_CTL]
Lower Power Consumption Mode
L
OFF
H
ON
= 2.4V voltage =
When 3.3V_A voltage is supplied, it is input to pin-4[VDD] and pin-1[CE] of +2.4V REGULATOR IC4302. Then IC4302 starts up. IC4302 generates +2.4[V] and outputs it from
pin-3[VOUT] as 2.4V_AD voltage and 2.4V_DAC voltage for the unit.
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Fig.1-2 3.3V/2.4V Generator Circuit
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1-4. Power Control by Multi Interface IC7001
MULTI INTERFACE IC7001 performs the power controls shown in Table.1-9 (See Fig.1-3).
Table.1-9 List of Power Control by System Controller IC1003
Terminals
ON
OFF
Remarks
IC7001 Pin-158 [GSEN_PWR_CTL]
H
L
The power control signal for B+ SWITCH IC8001 (H:ON)
IC7001 Pin-159 [BACKLIGHT_PWR]
H
L
The control signal for the backlight driver IC5001 (H: ON)
IC7001 Pin-157 [XHDD_PWR_CTL]
L
H
The power control signal for the HDD driving voltage (L: ON)
Fig.1-3 Power Control by Multi Interface IC7001
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2. Charging Circuit
2-1. Charging Circuit
Fig.2-1 shows the charging circuit. In this model, the charge control IC9002 controls all charge operation. In this unit, when DC-IN 6V voltage or VBUS voltage is supplied to
the unit, it is supplied to Pin-8 [PSEL] of IC9002 via D9008. Then, Charge Control IC9002 starts the operation corresponding to Table.2-1.
Table.2-1 Power Source Selection
Pin-8 [PSEL]
AC
USB
Charging Source
Maximum Charging Rate
System Power Source
H
Present
Absent
AC
ISET1
AC
H
Absent
Present
USB
ISET2
USB
H
Present
Present
AC
ISET1 X 1/2
AC
H
Absent
Absent
N/A
N/A
Battery
= Charging operation with the power supplied from AC power adapter =
When DC-IN 6V voltage is supplied to Pin-4 [AC] of IC9002, the controller section inside IC9002 starts the charging operation. As a rechargeable Lithium-ion Battery is
supplied for the model, the charging method is the constant current and constant voltage method. CHARGE CONTROL IC9002 performs the constant current charging with
the charging current shown in Table.2-6. The charging current can be set with the external register which is connected to Pin-10 [ISET1] of IC9002.
When the constant current charging terminates, CHARGE CONTROL IC9501 changes the mode from the constant current charging method to the constant voltage charging
method.
= Charging operation with VBUS voltage =
When VBUS voltage is supplied to Pin-20 [USB] of IC9002, the controller section inside IC9002 starts the charging operation. As a rechargeable Lithium-ion Battery is
supplied for the model, the charging method is the constant current and constant voltage method. CHARGE CONTROL IC9002 performs the constant current charging with
the charging current shown in Table.2-6. The charging current can be set with the external register which is connected to Pin-7 [ISET2] of IC9002. In this unit, MULTI
INTERFACE IC7001 controls the charging current depending on the current which is supplied from PC. (See Table.2-2)
When the constant current charging terminates, CHARGE CONTROL IC9501 changes the mode from the constant current charging method to the constant voltage charging
method.
Table.2-2 Charging Control by MULTI INTERFACE IC7001
Output Terminal
500[mA]- Permit
100[mA]- Permit
Description
IC7001 Pin-163 [VBUS_LIM]
H
L
Charging current control terminal during USB charging
During USB charging, MULTI INTERFACE IC7001 monitors the PC operation mode. If IC7001 detects that PC is in SUSPEND mode, IC7001 outputs “H” signal from Pin-162
[SUSPEND]. By this “H” signal, Q9005 turns “ON” and “L” signal is input toPin-9 [CE] of IC9002. Then, the controller section inside IC9002 stops and the charging operation
also stops.
also stops.
Table.2-3 Charging Control by MULTI INTERFACE IC7001
Output Terminal
PC: SUSPEND
PC: Normal
Description
IC7001 Pin-162 [SUSPEND]
H
L
Charging operation stops when PC is in SUSPEND mode.
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