3A, 28V, 1MHz 同步降压型DC-DC变换器EUP3475A,EUP3476A芯片集成了135mΩ主开关和 9(2)
时间:2015-09-09 10:49来源:未知 作者:oumao18 点击:
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下载产品资料PDF文档 upd3475a EUP3476A 五 , 产品封装图 (Package ) Number Pin Name Description 1 BS High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel DMOS
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五,产品封装图 (Package)
|
Number |
Pin Name |
Description |
|
1 |
BS |
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side
N-Channel DMOS switch. Connect a 0.01µF or greater capacitor from SW to BS
to power the high side switch. |
|
2 |
IN |
Power Input. IN supplies the power to the IC, as well as the step-down converter
switches. Drive IN with a 4.5V to 28V power source. Bypass IN to GND with a
suitably large capacitor to eliminate noise on the input to the IC. See Input
Capacitor. |
|
3 |
SW |
Power Switching Output. SW is the switching node that supplies power to the
output. Connect the output LC filter from SW to the output load. Note that a
capacitor is required from SW to BS to power the high-side switch. |
4
9 (Exposed Pad) |
GND |
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation. |
|
5 |
FB |
Feedback Input. FB senses the output voltage and regulates it. Drive FB with a
resistive voltage divider connected to it from the output voltage. The feedback
threshold is 0.8V. See Setting the Output Voltage. |
|
6 |
COMP |
Compensation Node. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND. In some cases, an additional
capacitor from COMP to GND is required. See Compensation Components. |
|
7 |
EN |
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN
high to turn on the regulator; low to turn it off. Connect to IN with a 100K pull
up resistor for automatic startup. |
|
8 |
SS |
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor
from SS to GND to set the external soft-start period, or leave SS floating to set
the internal soft-start period. A 0.1µF capacitor sets the soft-start period to about
15ms. Leave SS pin floating, and the internal soft-start period is about 300µs. |
六.电路原理图
七,功能概述
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