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PDF ( 数据手册 , 数据表 ) AX3002

零件编号 AX3002
描述 3A PWM Buck DC/DC Converter
制造商 AXElite
LOGO AXElite LOGO 


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AX3002 数据手册, 描述, 功能
AX3002
150KHz, 3A PWM Buck DC/DC Converter
™ GENERAL DESCRIPTION
The AX3002 series are monolithic IC designed for a step-down DC/DC converter,
and own the ability of driving a 3A load without additional transistor. It saves board
space. The external shutdown function can be controlled by logic level and then come
into standby mode. The internal compensation makes feedback control having good
line and load regulation without external design. Regarding protected function,
thermal shutdown is to prevent over temperature operating from damage, and current
limit is against over current operating of the output switch. If current limit function
occurs and VFB is down below 0.5V, the switching frequency will be reduced.
The AX3002 series operates at a switching frequency of 150KHz thus allow
smaller sized filter components than what would be needed with lower frequency
switching regulators. The output version included fixed 3.3V, 5V, 12V, and an
adjustable type. The chips are available in a 5-Lead TO-263 and 5-Lead TO-220
packages.
™ FEATURES
- Output voltage: 3.3V, 5V, 12V and adjustable output version.
- Adjustable version output voltage range, 1.23V to 19.5V.
- 150KHz fixed switching frequency.
- Voltage mode non-synchronous PWM control.
- Thermal-shutdown and current-limit protection.
- ON/OFF shutdown control input.
- Short Circuit Protect (SCP).
- Operating voltage can be up to 22V.
- Output load current: 3A.
- 5-Lead TO-263 & 5-Lead TO-220 Pb-Free packages.
- Low power standby mode.
- Built-in switching transistor on chip.
1/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Mar.12, 2008
Free Datasheet http://www.nDatasheet.com







AX3002 pdf, 数据表
150KHz, 3A PWM Buck DC/DC Converter AX3002
™ Function Descriptions (Continued)
For the best thermal performance, wide copper traces and generous amounts of
printed circuit board copper (need connect to the VSS pins) should be used in the
board layout, (One exception is the SW(switch) pin, which should not have large
areas of copper.) Large areas of copper provide the best transfer of heat (lower
thermal resistance) to the surrounding air, and moving air lowers the thermal
resistance even further.
Package thermal resistance and junction temperature increments are all
approximate. The increments are affected by a lot of factors. Some of these factors
include board size, shape, thickness, position, location, and even board temperature.
Other factors are, trace width, total printed circuit copper area, copper thickness,
single or double-sided, multi-layer board and the amount of solder on the board.
The effectiveness of the PC board to dissipate heat also depends on the size,
quantity and spacing of other components on the board, as well as whether the
surrounding air is still or moving. Furthermore, some of these components such as the
catch diode will add heat to the PC board and the heat can vary as the input voltage
changes. For the inductor, depending on the physical size, type of core material and the
DC resistance, it could either act as a heat sink taking heat away from the board, or it
could add heat to the board.
8/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.6 Mar.12, 2008
Free Datasheet http://www.nDatasheet.com














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