HP Model 712/100 hp 9000 series 700 model 712 technical reference manual (a261 - Page 66

Power Supply, Functional Information, Power Supply Specifications, Functional, Information

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7 Power Supply Functional Information The power supply is a semi-custom design. It is a 100KHz single-FET forward convertor with +5V and +12V as the two main outputs. Both of the main ouputs are sensed and fed back to provide an average regulation for the two outputs. The total continuous output power shall not exceed 70 Watts The power supply has a universal ac input to automaticlly sense line input voltage. An "Easy Power Off" feature is included in the power supply in order to allow the user to turn the system off without first doing a shutdown -h, which is usually required on Unix machines. With the "Easy Power Off" feature, when a user turns the On/Off switch off, a START_PWR_DOWN_L signal is coupled through an opto-coupler to the CPU chip, which causes the required shutdown routines to be initiated. When these routines have been completed, the I/O ASIC causes the POWER_UP_L signal to go high. This signal is coupled through another opto-coupler to the power supply, which then shuts down. The power supply will be customer removable with a screw driver after removing the top case of the computer. Power Supply Specifications Table 7-1. Power supply Output Specifications Voltage +5.1 V dc +12.0 V dc +3.3 V dc +5.0 V dc (SCSI) Current 11.5 A 1.0 A 1.0 A 0.5 A Table 7-2. Power Supply Input Specifications Input Power Input Voltage (115V range) Input Current (115V range) Input Voltage (230V range) Input Current (230V range) Line Frequency 110 W Max Input 90-132VAC 2.7A RMS max. 198-264 VAC 1.2A RMS max. 47 - 66 Hz Model 712 Technical Reference Power Supply 7-1

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7-1
Model 712 Technical Reference
Power Supply
7
Power Supply
Functional
Information
The power supply is a semi-custom design. It is a 100KHz single-FET forward convertor with
+5V and +12V as the two main outputs. Both of the main ouputs are sensed and fed back to
provide an average regulation for the two outputs. The total continuous output power shall not
exceed 70 Watts The power supply has a universal ac input to automaticlly sense line input voltage.
An "Easy Power Off" feature is included in the power supply in order to allow the user to turn
the system off without first doing a shutdown -h, which is usually required on Unix machines.
With
the
"Easy
Power
Off"
feature,
when
a
user
turns
the
On/Off
switch
off,
a
START_PWR_DOWN_L signal is coupled through an opto-coupler to the CPU chip, which
causes the required shutdown routines to be initiated. When these routines have been completed,
the I/O ASIC causes the POWER_UP_L signal to go high. This signal is coupled through another
opto-coupler to the power supply, which then shuts down. The power supply will be customer
removable with a screw driver after removing the top case of the computer.
Power Supply Specifications
Table 7-1.
Power supply Output Specifications
Voltage
Current
+5.1
V dc
+12.0 V dc
+3.3 V dc
+5.0 V dc (SCSI)
1
1.5 A
1.0 A
1.0 A
0.5 A
Table 7-2.
Power Supply Input Specifications
Input
Power
1
10 W Max Input
Input V
oltage (1
15V range)
90–132VAC
Input Current (1
15V range)
2.7A RMS max.
Input V
oltage (230V range)
198–264 V
AC
Input Current (230V range)
1.2A RMS max.
Line Frequency
47 – 66 Hz