HYT TC-508, Руководство по обслуживанию

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TC-508 Service Manual
12
2.5 Power Supply Section
LDO
U604
LDO
U602
LDO
U606
V_BAT
T
X
_
C
T
L
S
A
V
E
VT
VR SW
Q604
Q305
V_SAVE
VR
VCC
VDD
5V
R
F
_
M
U
T
E
Figure 6
Power Supply Section: The 7.4V battery voltage is converted to 5V via DC-DC module U604, and further
converted via LDO U602 to 3V including two channels: VCC and VDD. VCC powers CPU and VDD
powers PLL circuit. The 5V voltage will be converted via LDO U606 to 4.5V including two channels: VT
and V-SAVE. V-SAVE powers VCO circuit and VT powers TX circuit. Finally, V-SAVE controlled by Q604
and Q305 outputs VR, which supplies RX circuit.