FDMF8704 查看數據表（PDF） - Fairchild Semiconductor
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FDMF8704 Datasheet PDF : 11 Pages
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Application Information
Supply Capacitor Selection
For the supply input (VCIN) of the FDMF8704, a local ceramic
bypass capacitor is recommended to reduce the noise and to
supply the peak current. Use at least a 1µF, X7R or X5R
capacitor. Keep this capacitor close to the FDMF8704 VCIN and
CGND pins.
Bootstrap Circuit
The bootstrap circuit uses a charge storage capacitor (CBOOT)
and the external schottky diode, as shown in Figure 18. A
Typical Application
VIN 12V
VCIN 5V
bootstrap capacitance of 100nF, X7R or X5R capacitor is
adequate.
The peak surge current rating of the boot diode should be
checked in-circuit, since this is dependent on the equivalent
impedance of the entire bootstrap circuit, including the PCB
traces. Boot diode must be sized big enough to carry the
forward charge current. Refer to Figure 14 for boot diode
average forward current.
The bootstrap diode must have low VF and low reverse current
leakage. Breakdown voltage of the bootstrap diode must be
greater than the BOOT to VSWH voltage.
VIN VCIN
PWM BOOT
HSEN
DISB VSWH
CGND PGND
FDMF8704
VCC EN
PWM1
PWM
PWM2
Controller PWM3
PWM4
GND
Signal Power
GND GND
VIN VCIN
PWM BOOT
HSEN
DISB VSWH
CGND PGND FDMF8704
VIN VCIN
PWM BOOT
HSEN
DISB VSWH
CGND PGND
FDMF8704
FDMF8704 Rev. F2
VIN VCIN
PWM BOOT
HSEN
DISB VSWH
CGND PGND
FDMF8704
Figure 17. Typical Application
8
VOUT
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