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LM3478 데이터시트(PDF) 1 Page - Texas Instruments

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부품명 LM3478
상세설명  High-Efficiency Low-Side N-Channel Controller for Switching Regulator
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LM3478
LM3478-Q1
www.ti.com
SNVS085V – JULY 2000 – REVISED FEBRUARY 2013
High-Efficiency Low-Side N-Channel Controller for Switching Regulator
Check for Samples: LM3478, LM3478-Q1
1
FEATURES
APPLICATIONS
2
LM3478Q in VSSOP-8 package is AEC-Q100
Distributed Power Systems
qualified and manufactured on an Automotive
Battery Chargers
Grade Flow
Offline Power Supplies
8-lead VSSOP-8 and SOIC-8 packages
Telecom Power Supplies
Internal push-pull driver with 1A peak current
Automotive Power Systems
capability
Current limit and thermal shutdown
KEY SPECIFICATIONS
Frequency compensation optimized with a
Wide supply voltage range of 2.97V to 40V
capacitor and a resistor
100kHz to 1MHz Adjustable clock frequency
Internal soft start
±2.5% (over temperature) internal reference
Current Mode Operation
10µA shutdown current (over temperature)
Undervoltage Lockout with hysteresis
DESCRIPTION
The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use
in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be
operated at extremely high switching frequency in order to reduce the overall solution size. The switching
frequency of the LM3478 can be adjusted to any value between 100kHz and 1MHz by using a single external
resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle
current limiting. Output current can be programmed with a single external resistor.
The LM3478 has built in features such as thermal shutdown, short-circuit protection, over voltage protection, etc.
Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing.
Internal soft-start limits the inrush current at start-up.
Typical Application Circuit
Figure 1. Typical High Efficiency Step-Up (Boost) Converter
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 © 2000–2013, 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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