Power Supply - Toshiba 400CS User Manual

1.9

Power Supply

The power supply supplies five kinds of voltages to the 400 series system board. The power
supply has one microprocessor, which operates at 500 KHz, and performs the following
functions:
1. Determines if the AC cable or battery is connected to the computer.
2. Detects AC output and circuit malfunctions.
3. Controls the LED icon and speaker.
4. Turns the battery charging system on and off and detects a fully charged battery.
5. Determines if the power can be turned on and off.
6. Provides more accurate detection of a low battery.
7. Calculates the remaining battery capacity.
The power supply output rating is specified in table 1-8.
Use for
System logic, FDD, HDD,
Display
CPU
Flash ROM, PCMCIA
CPU, RAM, GA
VRAM, GA
400 Series
Table 1-8 Power supply output rating
Name voltage
VCC
CPUV
12V
B3V
B5V
DC Regulation
tolerance
(%)
+5 ±5
+2.9 ±5
+12 ±5
+3.3 ±0.3V
+4.7 ±5
1-17