Read Panasonic KX-TCA175RU Service Manual online
8
KX-TCA175RU
4.2.3.
Charge Circuit (Include Charger)
• Charge current is controlled as follows.
• Charge mode is trickle charge.
• Charge current repeats ON and OFF as follows.
• Charge current repeats ON and OFF as follows.
• Charge route
DC+ (6.5V)
→ IP1 → D1 → R2, R3 and R4 → CHG+ (Charger) → CHG+ (Handset) → L2 → Q2 → D13 → IP101 → Battery →
GND
→ R5 → CHG- (Handset) → CHG- (Charger) → GND
4.2.4.
Battery Low/Power Down Detector
"Battery Low" and "Power Down" are detected by BBIC (IC3) which checks the battery voltage.
The detected voltage is as follows;
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 3.5V ± 50mV
The BBIC detects this level and "
The BBIC detects this level and "
" starts flashing.
• Power Down
Battery voltage: V(Batt) 3.3V ± 50mV
The BBIC detects this level and power down.
The BBIC detects this level and power down.
IC3-97pin
Q4
Q3
Q2
Charge ON
Low
OFF
ON
ON
Charge Off
High
ON
OFF
OFF
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