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SM74301 Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte SM74301
Spiegazioni elettronici  SM74301 100V, 350 mA Constant On-Time Buck Switching Regulator
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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SM74301 Scheda tecnica(HTML) 1 Page - Texas Instruments

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RT/SD
FB
VIN
SW
RTN
BST
6V - 95V
Input
SM74301
SHUTDOWN
RCL
VCC
VIN
GND
RCL
RT
C1
C3
C4
L1
D1
RFB2
RFB1
R3
C2
GND
VOUT
SM74301
www.ti.com
SNVS719A – JULY 2011
SM74301 100V, 350 mA Constant On-Time Buck Switching Regulator
Check for Samples: SM74301
1
FEATURES
PACKAGE
2
Renewable Energy Grade
VSSOP-8
Operating Input Voltage Range: 6V to 95V
WSON-8 (4mm x 4mm)
Integrated 100V, N-Channel Buck Switch
DESCRIPTION
Internal Start-Up Regulator
The SM74301 is a Constant On-Time (COT) Buck
No Loop Compensation Required
Switching
Regulator
which
operates
at
a
low
Ultra-Fast Transient Response
minimum input voltage of 6V and does not require a
minimum load current as some other COT parts.
On Time Varies Inversely with Input Voltage
Operating Frequency Remains Constant with
The
SM74301
Step
Down
Switching
Regulator
Varying Line Voltage and Load Current
features all of the functions needed to implement a
low cost, efficient, Buck bias regulator. This high
Adjustable Output Voltage from 2.5V
voltage regulator contains a 100V N-Channel Buck
Highly Efficient Operation
Switch. The device is easy to implement and is
Precision Internal Reference
provided in the VSSOP-8 and the thermally enhanced
WSON-8 packages. The regulator is based on a
Low Bias Current
control
scheme
using
an
ON
time
inversely
Intelligent Current Limit
proportional to VIN. This feature allows the operating
Thermal Shutdown
frequency to remain relatively constant. The control
scheme requires no loop compensation. An intelligent
current limit is implemented with forced OFF time,
TYPICAL APPLICATIONS
which is inversely proportional to Vout. This scheme
High Voltage Photovoltaic Systems
ensures short circuit control while providing minimum
Non-Isolated Telecommunication Buck
foldback. Other features include: Thermal Shutdown,
Regulator
VCC under-voltage lockout, Gate drive under-voltage
lockout, Max Duty Cycle limiter, and a pre-charge
Secondary High Voltage Post Regulator
switch.
Typical Application, Basic Step-Down Regulator
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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