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• +12V_BA supply: To the BA board
• Power supply method: Two-channel synchronous rectification-type step-down DC-DC converter
• Components:
- DC-DC converter IC (IC4000)
- +5V switching FET (Q4004, Q4005)
- +5V coil (L4001)
- +5V output capacitor (C4023: Electrolytic capacitor)
- +12V_BA switching FET（Q4002, Q4003）
- +12V_BA coil (L4000)
- +12V_BA output capacitor (C4022: Electrolytic capacitor)
• Setting output voltages:
- +5V
- +12V_BA 5 V
• Circuit description
This circuit generates +5V and +12V_BA voltages by using a 2-channel synchronous rectification-type DC-DC
converter IC. Switching of an input voltage is performed by the two FETs controlled by the synchronous
rectification-type DC-DC converter IC to lower the voltage and shape the output voltage waveform with a coil and
an output capacitor.
Configuration of panel power
A 28 V voltage necessary for the panel power is generated by lowering the OUT_24V or DC_24V input voltage to +15.5
V and then boosting it to 28 V.
Input voltage: OUT_24V or DC_24V
2-channel
synchronous
rectification-type
step down
DC-DC converter
+15.5V
28V_TC synchronous rectification-type step-up DC-DC converter
• 28V_TCsupply: BC board (for panel power)
• Power supply method: Synchronous rectification-type step-up DC-DC converter
• Components:
- DC-DC converter IC (IC5001)
- Input capacitor (C5001, C5002: Electrolytic capacitor)
- 28V_TC switching FET (Q5004, Q5005)
- 28V_TC coil (L5000)
- 28V_TC output capacitor (C5040, C5041, C5043, C5044: Electrolytic capacitor)
• Setting output voltages: 28V_TC 28 V
BVM-E171
Backlight power supply
Step up
DC-DC converter
+ 28V_TC
7-8
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