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参数资料
| 型号： | FA7738N |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 6/19页 |
| 文件大小： | 484K |
| 代理商： | FA7738N |
14
FA7738N/P
(12) VBIAS circuit
The system incorporates VBIAS terminal to increase
the efficiency of the power supply circuit and reduce
IC loss. The internal power supply circuit of most
ICs is generated by voltage supplied by the VCC
voltage. The resulting output voltage of the power
supply circuit can be returned to the VBIAS terminal
to keep the voltage source for generating an internal
power supply at a low level, thus enabling operation
at lower power consumption (Fig. 5).
Fig. 5
When no VBIAS terminal is used, the operating
current consumption of the VCC terminal is 0.75 mA
(typically). When a VBIAS terminal is used, the
comparable consumption is 0.4 mA(typically).
This operation switchover is performed when the
VBIAS terminal voltage (i.e., output voltage of the
power supply circuit) is 3.1 V.
Therefore, said
operation will be effective only when the output
voltage of the power supply circuit is more than 3.1
V.
Moreover, the VBIAS terminal incorporates a 5.5 V
Zener diode for protection. This ensures that, if
voltage of more than 5.5 V is applied to the VBIAS
terminal, a current will be applied to the Zener diode,
resulting in a rise in the loss.
Therefore, use the power supply circuit with an
output voltage between 3.1 V and 5.5 V when using
the VBIAS terminal.
When no VBIAS terminal is used (with the power
supply circuit having an output voltage less than 3.1
V or more than 5.5 V), connect the VBIAS terminal
to GND (Fig. 6).
Fig. 6
When a VBIAS terminal is used, connect a ceramic
capacitor close to the VBIAS terminal as shown in
Fig. 5 to eliminate noise (about 0.1 μF is
recommended).
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