CXA2534Q
f) PWM Driver For PVCC
To ensure the good power efficiency of the H-bridge driver, a Buck DC-to-DC converter may be used to
regulate the PVCC. The controller selects the peak voltage among the channels and used it to control
the duty cycle of the PWM. External components necessary are: PNP transistor, inductor coil, diode
and capacitors. The configuration of a Buck DC-to-DC converter is shown as follow:
BATT
33µ
10pF
47µF
0.1µF
2200pF
100k
47
PWMFIL
27
PSW
PVCC
PVCC
29
14
19
CXA2534Q
g) Bypass Capacitor
To have prevent noise, a bypass capacitor (roughly 0.1 µF) is connected from PVCC pin to the GND pin
as close as possible.
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SONY [ SONY CORPORATION ]
