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发表于 2008-2-18 11:36:19
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LM3478
LM3478
High Efficiency Low-Side N-Channel Controller for
Switching Regulator
General Description
The LM3478 is a versatile Low-Side N-FET switching regulator
controller. It is suitable for use in topologies requiring
low side FET, 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 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.
Key Specifications
n Wide supply voltage range of 2.97V to 40V
n 100kHz to 1MHz Adjustable clock frequency
n ±2.5% (over temperature) internal reference
n 10μA shutdown current (over temperature)
Features
n 8-lead Mini-SO8 (MSOP-8) package
n Internal push-pull driver with 1A peak current capability
n Current limit and thermal shutdown
n Frequency compensation optimized with a capacitor and
a resistor
n Internal softstart
n Current Mode Operation
n Undervoltage Lockout with hysteresis
Applications
n Distributed Power Systems
n Battery Chargers
n Offline Power Supplies
n Telecom Power Supplies
n Automotive Power Systems |
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IP卡
狗仔卡
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
显身卡