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XL2576 Schematic ( PDF Datasheet ) - XLSEMI

Teilenummer XL2576
Beschreibung 3A 52KHz 40V Buck DC to DC Converter
Hersteller XLSEMI
Logo XLSEMI Logo 




Gesamt 14 Seiten
XL2576 Datasheet, Funktion
3A 52KHz 40V Buck DC to DC Converter
Datasheet
XL2576
Features
n Wide 4.5V to 40V Input Voltage Range
n 3.3V,5V,12V and adjustable versions
n Output Adjustable from 1.23V to 37V
n Maximum Duty Cycle 100%
n Minimum Drop Out 1.5V
n Fixed 52KHz Switching Frequency
n 3A Constant Output Current Capability
n Internal Optimize Power Transistor
n High efficiency
n Excellent line and load regulation
n TTL shutdown capability
n ON/OFF pin with hysteresis function
n Built in thermal shutdown function
n Built in current limit function
n Available in TO-220,TO-263 packages
General Description
The XL2576 is a 52 KHz fixed frequency
PWM buck (step-down) DC/DC converter,
capable of driving a 3A 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.
Applications
n LCD Monitor and LCD TV
n Digital Photo Frame
n Set-up Box
n ADSL Modem
n Telecom / Networking Equipment
Rev 2.2
Figure1. Package Type of XL2576
1






XL2576 Datasheet, Funktion
3A 52KHz 40V Buck DC to DC Converter
XL2576-3.3 Electrical Characteristics
Ta = 25;unless otherwise specified.
Symbol Parameter
Test Condition
System parameters test circuit figure5
VOUT
Efficiency
Output
Voltage
ŋ
Vin = 4.75V to 40V
Iload=0.2A to 3A
Vin=12V ,Vout=3.3V
Iout=3A
XL2576-5.0 Electrical Characteristics
Ta = 25;unless otherwise specified.
Symbol Parameter
Test Condition
System parameters test circuit figure5
VOUT
Efficiency
Output
Voltage
ŋ
Vin = 7V to 40V
Iload=0.2A to 3A
Vin=12V ,Vout=5V
Iout=3A
XL2576-ADJ Electrical Characteristics
Ta = 25;unless otherwise specified.
Symbol Parameter
Test Condition
System parameters test circuit figure5
VOUT
Efficiency
Output
Voltage
ŋ
Vin = 4.5V to 40V
Iload=0.2A to 3A
Vin=12V ,Vout=3V
Iout=3A
Datasheet
XL2576
Min. Typ. Max. Unit
3.168 3.3 3.432 V
- 75 - %
Min. Typ. Max. Unit
4.8 5 5.2 V
- 78 - %
Min. Typ. Max. Unit
1.193 1.23 1.267 V
- 73 - %
Rev 2.2
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
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XL2576 pdf, datenblatt
3A 52KHz 40V Buck DC to DC Converter
Datasheet
XL2576
Typical System Application for ADJ Version
CFF 10n
R1 1K
R2 3.1K
+24V
CIN
470uf 50V
FEEDBACK
VIN
1
4
XL2576-ADJ
2
OUTPUT
35
GND ON/OFF
C1
105
OFF
ON
L1 150uh/3A
5V/3A
COUT
D1
LOAD
470uf 35V
1N5821
VOUT=1.23*(1+R2/R1)
Figure8. XL2576-ADJ System Parameters Test Circuit
Rev 2.2
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
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