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LMZ14202TZE-ADJ bảng dữ liệu(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LMZ14202TZE-ADJ
Giải thích chi tiết về linh kiện  2A SIMPLE SWITCHER짰 Power Module with 42V Maximum Input Voltage
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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Current Limit 3.3V
OUT @ 25°C
30114554
Current Limit 3.3V
OUT @ 85°C
30114568
Application Block Diagram
30114508
COT Control Circuit Overview
Constant On Time control is based on a comparator and an
on-time one shot, with the output voltage feedback compared
with an internal 0.8V reference. If the feedback voltage is be-
low the reference, the main MOSFET is turned on for a fixed
on-time determined by a programming resistor R
ON. RON is
connected to V
IN such that on-time is reduced with increasing
input supply voltage. Following this on-time, the main MOS-
FET remains off for a minimum of 260 ns. If the voltage on the
feedback pin falls below the reference level again the on-time
cycle is repeated. Regulation is achieved in this manner.
Design Steps for the LMZ14202
Application
The LMZ14202 is fully supported by Webench® and offers
the following: Component selection, electrical and thermal
simulations as well as the build-it board for a reduction in de-
sign time. The following list of steps can be used to manually
design the LMZ14202 application.
• Select minimum operating V
IN with enable divider resistors
• Program V
O with divider resistor selection
• Program turn-on time with soft-start capacitor selection
• Select C
O
• Select C
IN
• Set operating frequency with R
ON
• Determine module dissipation
• Layout PCB for required thermal performance
ENABLE DIVIDER, R
ENT AND RENB SELECTION
The enable input provides a precise 1.18V band-gap rising
threshold to allow direct logic drive or connection to a voltage
divider from a higher enable voltage such as V
IN. The enable
input also incorporates 90 mV (typ) of hysteresis resulting in
a falling threshold of 1.09V. The maximum recommended
voltage into the EN pin is 6.5V. For applications where the
midpoint of the enable divider exceeds 6.5V, a small zener
can be added to limit this voltage.
The function of this resistive divider is to allow the designer to
choose an input voltage below which the circuit will be dis-
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LMZ14202TZE-ADJ NSC-LMZ14202TZE-ADJ Datasheet
1Mb / 18P
   2A SIMPLE SWITCHER짰 Power Module with 42V Maximum Input Voltage
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1Mb / 18P
   2A SIMPLE SWITCHER짰 Power Module with 42V Maximum Input Voltage
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Texas Instruments
LMZ14202TZE-ADJ/NOPB TI-LMZ14202TZE-ADJ/NOPB Datasheet
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Mô tả tương tự - LMZ14202TZE-ADJ

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
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