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XL4301 Schematic ( PDF Datasheet ) - XLSEMI

Teilenummer XL4301
Beschreibung 3A 180KHz 45V Buck DC/DC Converter
Hersteller XLSEMI
Logo XLSEMI Logo 




Gesamt 10 Seiten
XL4301 Datasheet, Funktion
XLSEMI
3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop
Datasheet
XL4301
Features
„ Operation Voltage from 8V to 40V
„ Adjust VOUT from 1.25V to VIN-2V
„ Minimum Drop Out 0.3V
„ Fixed 180KHz Switching Frequency
„ Maximum 3A Switching Current
„ Internal Optimize Power MOSFET
„ Excellent line and load regulation
„ With output constant current loop
„ Built in thermal shutdown function
„ Built in current limit function
„ Built in output cable compensation
„ Recommend output power less than 13W
„ SOP8-EP (Exposed PAD) package
Applications
„ Car Charger
„ Battery Charger
„ LCD Monitor and LCD TV
„ Portable instrument power supply
„ Telecom / Networking Equipment
„ Buck constant current driver
General Description
The XL4301 is a 180KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 2.5A 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 enable
function, an over current protection function
is built inside. An internal compensation
block is built in to minimize external
component count.
The XL4301 built in a simple,
user-programmable output cable voltage drop
compensation function. Use the curve in
Table 2 to choose the proper compensation
resistance values for cable compensation.
Rev1.0
Figure1. Package Type of XL4301
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1






XL4301 Datasheet, Funktion
XLSEMI
3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop
Typical System Application (Car Charger)
Datasheet
XL4301
Figure5. XL4301 System Parameters Test Circuit (VIN=8V~40V, VOUT=5V/0.1A~2.5A)
Output voltage VS Output current
5.5
5.0
4.5
4.0
3.5
3.0 VIN=8V,VOUT=5V,IOUT=0.1A~2.8A
2.5 VIN=12V,VOUT=5V,IOUT=0.1A~2.8A
VIN=24V,VOUT=5V,IOUT=0.1A~2.8A
2.0 VIN=36V,VOUT=5V,IOUT=0.1A~2.8A
1.5
1.0
0.5
0.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Output current(A)
Figure6. Output Constant Current Curve
Efficiency VS Output current
100
95
90
85
80
75
70
65 VIN=8V,VOUT=5V,IOUT=0.1A~2.5A
60 VIN=12V,VOUT=5V,IOUT=0.1A~2.5A
VIN=24V,VOUT=5V,IOUT=0.1A~2.5A
55 VIN=36V,VOUT=5V,IOUT=0.1A~2.5A
50
45
40
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50
Output current(A)
Figure7. Efficiency Curve
Output voltage VS Output current
5.3
5.2
5.1
5.0
4.9 VIN=8V,VOUT=5V,IOUT=0.1A~2.5A
VIN=12V,VOUT=5V,IOUT=0.1A~2.5A
VIN=24V,VOUT=5V,IOUT=0.1A~2.5A
4.8 VIN=36V,VOUT=5V,IOUT=0.1A~2.5A
4.7
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
Output current(A)
Figure8. Line&Load regulation Curve
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-50
-25
0
25 50 75 100 125
Figure9. Feedback voltage Curve
Rev1.0
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