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LM25007MM bảng dữ liệu(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
tên linh kiện LM25007MM
Giải thích chi tiết về linh kiện  42V, 0.5A Step-Down Switching Regulator
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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Pin Descriptions
Pin
Name
Description
Application Information
1
SW
Switching Node
Power switching node. Connect to the inductor,
bootstrap capacitor, and free-wheeling diode.
2
BST
Boost Boot–strap capacitor input
An external capacitor is required between the BST
and the SW pins. A 0.01µF ceramic capacitor is
recommended.
3
RCL
Current Limit OFF time programming pin
A resistor between this pin and RTN sets the
off-time when current limit is detected. The off-time
is preset to 17 µs if FB = 0V .
4
RTN
Circuit Ground
5
FB
Feedback Signal from Regulated Output
This pin is connected to the inverting input of the
internal regulation comparator. The regulation
threshold is 2.5V.
6
RON/SD
On-time set pin
A resistor between this pin and VIN sets the switch
on-time as a function of Vin. The minimum
recommended on-time is 300ns at the maximum
input voltage.
7
VCC
Output from the internal high voltage bias
regulator.
If an auxiliary voltage is available to raise the
voltage on this pin above the regulation setpoint
(7V), the internal series pass regulator will
shutdown, reducing the IC power dissipation. Do not
exceed 14V. This output provides gate drive power
for the internal Buck switch. An internal diode is
provided between this pin and the BST pin. A local
0.1uF decoupling capacitor is recommended.
8
VIN
Input supply voltage
Recommended operating range: 9V to 42V.
-
EP
Exposed pad, underside of the LLP package
option
Exposed metal pad on the LLP package underside.
It is recommended to connect this pad to the PC
board ground plane to aid in heat dissipation.
www.national.com
3


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