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POWER SYSTEM
This product uses an external power adapter to provide DC+12V. It is the source of other
voltages +5VX, 3.3VX, and VLCD.
The voltage of +5VX is produced by regulator LM2596-5V (U5) and external components that
can realize DC to DC conversion from +12V to +5V. For some chips (MPU, ADC) that are
sensitive to any voltage variance, we need LDO 1084-3.3V (U11) to produce a stable voltage
3.3VX.
There is still an important consideration about power consumption. We must greatly reduce
the power consumption even up to 90% in power saving mode. So we need to switch off the
power that needn't exist when the system enters to this mode. We use the P-channel
MOSFET TRLML6402 (Q1) to control the on/off state of the panel's power VLCD.
See FIG1-1.
FIG1-1
ViewSonic Corporation
14
Confidential -
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Do Not Copy
VE510+-1
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