XL4012 降压型直流电源变换器芯片(大功率型)

12A 300KHz 32V Buck DC to DC Converter XL4012
Rev 2.0 www.xlsemi.com
1
Features
􀂄 Wide 5V to 32V Input Voltage Range
􀂄 Output Adjustable from 0.8V to 30V
􀂄 Maximum Duty Cycle 100%
􀂄 Minimum Drop Out 0.6V
􀂄 Fixed 300KHz Switching Frequency
􀂄 12A Constant Output Current Capability
􀂄 Internal Optimize Power MOSFET
􀂄 High efficiency
􀂄 Excellent line and load regulation
􀂄 Built in thermal shutdown function
􀂄 Built in current limit function
􀂄 Built in output short protection function
􀂄 Available in TO-220 package
Applications
􀂄 LCD Monitor and LCD TV
􀂄 Di*al Photo Frame
􀂄 Set-up Box
􀂄 ADSL Modem
􀂄 Telecom / Networking Equipment
General Description
The XL4012 is a 300 KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 12A load with high
efficiency, low ripple and excellent line and
load regulation. Requiring a minimum
number of external components, the regulator
is simple to use and include internal
frequency compensation and a
fixed-frequency oscillator.
The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 100%. An over
current protection function is built inside.
When short protection function happens, the
operation frequency will be reduced from
300KHz to 60KHz. An internal compensation
block is built in to minimize external
component count.
Figure1. Package T*e of XL4012