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Teilenummer | XL4012 |
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Beschreibung | 12A 300KHz 32V Buck DC to DC Converter | |
Hersteller | Xlsemi | |
Logo | ||
Gesamt 9 Seiten 12A 300KHz 32V Buck DC to DC Converter
Datasheet
XL4012
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
Digital 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 Type of XL4012
12A 300KHz 32V Buck DC to DC Converter
Test Circuit and Layout guidelines
Datasheet
XL4012
Figure5. Standard Test Circuits and Layout Guides
Select R1 to be approximately 2K, use a 1% resistor for best stability.
C1 and CFF are optional; in order to increase stability and reduce the input power line noise, CIN
and C1 must be placed near to VIN and GND;
For output voltages greater than approximately 10V, an additional capacitor CFF is required. The
compensation capacitor is typically between 100 pf and 33 nf, and is wired in parallel with the
output voltage setting resistor, R2. It provides additional stability for high output voltage, low
input-output voltages, and/or very low ESR output capacitors, such as solid tantalum capacitors.
CFF=1/(31*1000*R2); This capacitor type can be ceramic, plastic, silver mica, etc. (Because of
the unstable characteristics of ceramic capacitors made with Z5U material, they are not
recommended.)
6 Page | ||
Seiten | Gesamt 9 Seiten | |
PDF Download | [ XL4012 Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
XL4012 | 12A 300KHz 32V Buck DC to DC Converter | Xlsemi |
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