XL2596S-3.3E1 [ETC]
3A 150KHz 40V Buck DC to DC Converter;
| 型号： | XL2596S-3.3E1 |
| 厂家： | 
ETC |
| 描述： | 3A 150KHz 40V Buck DC to DC Converter |
| 文件： | 总14页 (文件大小：407K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Features
General Description
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
The XL2596 is a 150 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
n Fixed 150KHz Switching Frequency
n 3A Constant Output Current Capability
n Internal Optimize Power Transistor
n High efficiency
number of external components, the regulator
is simple to use and include internal
frequency
compensation
and
a
fixed-frequency oscillator.
n Excellent line and load regulation
n TTL shutdown capability
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. When second current limit
function happens, the operation frequency
will be reduced from 150KHz to 50KHz. An
internal compensation block is built in to
minimize external component count.
n ON/OFF pin with hysteresis function
n Built in thermal shutdown function
n Built in current limit function
n Built in second current limit function
n Available in TO-220,TO-263 packages
Applications
n LCD Monitor and LCD TV
n Digital Photo Frame
n Set-up Box
n ADSL Modem
n Telecom / Networking Equipment
Figure1. Package Type of XL2596
Rev 2.4
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1
Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Pin Configurations
Figure2. Pin Configuration of XL2596 (Top View)
Table 1 Pin Description
Pin Number
Pin Name Description
Supply Voltage Input Pin. XL2596 operates from a 4.5V to
40V DC voltage. Bypass Vin to GND with a suitably large
capacitor to eliminate noise on the input.
1
VIN
Power Switch Output Pin (SW). Output is the switch node that
supplies power to the output.
Ground Pin. Care must be taken in layout. This pin should be
placed outside of the Schottky Diode to output capacitor
ground path to prevent switching current spikes from inducing
voltage noise into XL2596.
2
3
OUTPUT
GND
Feedback Pin (FB). Through an external resistor divider
4
5
FEEDBACK network, Feedback senses the output voltage and regulates it.
The feedback threshold voltage is 1.23V.
Enable Pin. Drive ON/OFF pin low to turn on the device, drive
ON/OFF
it high to turn it off. Floating is default low.
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Function Block
Figure3. Function Block Diagram of XL2596
Typical Application Circuit
Figure4. XL2596 Typical Application Circuit 12V-5V/3A
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Ordering Information
XL2596
E1
E1: Lead Free
Circuit Type
Package
Version
S: TO263-5L
T: TO220-5L
ADJ: Adjust
3.3: 3.3V
5.0: 5V
12: 12V
Temperature
Marking ID
Lead Free
Package
Range
Packing Type Supplied As
XL2596T-ADJE1
XL2596T-3.3E1
XL2596T-5.0E1
XL2596T-12E1
XL2596S-ADJE1
XL2596S-3.3E1
XL2596S-5.0E1
XL2596S-12E1
Tube
Tube
TO220-5L
TO263-5L
-40oC ~ 85oC
-40oC ~ 85oC
Tube
Tube
800 Units on Tape & Reel
800 Units on Tape & Reel
800 Units on Tape & Reel
800 Units on Tape & Reel
XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Absolute Maximum Ratings（Note1）
Parameter
Input Voltage
Symbol
Vin
Value
-0.3 to 45
Unit
V
Feedback Pin Voltage
-0.3 to Vin
V
VFB
ON/OFF Pin Voltage
-0.3 to Vin
-0.3 to Vin
V
VON/OFF
VOutput
PD
Output Switch Pin Voltage
Power Dissipation
V
Internally limited
mW
Thermal Resistance (TO220 & TO263)
(Junction to Ambient, No Heatsink, Free Air)
Operating Junction Temperature
Storage Temperature
30
ºC/W
RJA
-40 to 125
-65 to 150
260
ºC
ºC
ºC
V
TJ
TSTG
TLEAD
Lead Temperature (Soldering, 10 sec)
ESD (HBM)
2000
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage
to the device. This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
XL2596-3.3 Electrical Characteristics
Ta = 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
System parameters test circuit figure6
Output
Voltage
Vin = 4.75V to 40V
VOUT
3.168 3.3 3.432
73
V
Iload=0.2A to 3A
Vin=12V ,Vout=3.3V
Iout=3A
Efficiency
-
-
%
ŋ
XL2596-5.0 Electrical Characteristics
Ta = 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
System parameters test circuit figure7
Output
Voltage
Vin = 7V to 40V
VOUT
4.8
-
5
5.2
-
V
Iload=0.2A to 3A
Vin=12V ,Vout=5V
Iout=3A
Efficiency
80
%
ŋ
XL2596-12 Electrical Characteristics
Ta = 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
System parameters test circuit figure8
Output
Voltage
Vin = 15V to 40V
VOUT
11.52
-
12
90
12.48
-
V
Iload=0.2A to 3A
Vin=25V ,Vout=12V
Iout=3A
Efficiency
%
ŋ
XL2596-ADJ Electrical Characteristics
Ta = 25℃;unless otherwise specified.
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
System parameters test circuit figure9
Output
Voltage
Vin = 4.5V to 40V
VOUT
1.193 1.23 1.267
73
V
Iload=0.2A to 3A
Vin=12V ,Vout=3V
Iout=3A
Efficiency
-
-
%
ŋ
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Electrical Characteristics (DC Parameters)
Vin = 12V for the 3.3V,5V,and Adjustable versions and Vin=24V for the 12V version, GND=0V,
Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, Ta = 25℃; the others floating
unless otherwise specified.
Parameters
Symbol
Vin
Test Condition
Min. Typ. Max. Unit
Input operation voltage
Shutdown Supply Current
4.5
40
V
ISTBY
VON/OFF=5V
80
2
200
uA
VON/OFF =0V,
VFB =Vin
Quiescent Supply Current
Iq
10
mA
Oscillator Frequency
Switch Current Limit
Fosc
IL
127
3.6
150
4.8
173
6.9
Khz
A
VFB =0
High (Regulator OFF)
Low (Regulator ON)
1.4
0.8
ON/OFF Pin Threshold
VON/OFF
V
IH
IL
VON/OFF =2.5V (OFF)
VON/OFF =0.5V (ON)
5
15
5
uA
uA
ON/OFF
Pin
Input
Leakage Current
0.2
VFB=0V
Iout=3A
Output Saturation Voltage
Max. Duty Cycle
VCE
1.3
1.5
V
DMAX
VFB=0V
100
%
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Test Circuit and Layout guidelines
Figure5. Standard Test Circuits and Layout Guides
Select R1 to be approximately 1K, 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 PIN1 and PIN3;
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.)
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
XL2596 Series Buck Regulator Design Procedure (Fixed Output)
Conditions
Inductor
(L1)
Output Capacitor (COUT)
Through Hole Electrolytic
Surface Mount Tantalum
Output Load
Max Input Inductance Panasonic
Nichicon
PL Series
(uf/V)
AVX TPS
Series
Sprague
595D Series
(uf/V)
Voltage Current Voltage (V) (uh)
HFQ Series
(uf/V)
(V)
3.3
(A)
3
(uf/V)
5
22
22
22
33
22
33
47
22
22
33
47
22
68
68
22
33
68
68
33
68
150
470/25
560/35
680/35
560/35
470/25
330/35
330/35
470/25
560/25
330/35
330/35
470/25
180/35
180/35
470/25
330/25
180/25
180/35
330/25
180/25
82/25
560/16
560/35
680/35
470/35
470/35
330/35
270/50
560/16
560/25
330/35
270/35
560/16
180/35
180/35
470/25
330/25
180/25
180/25
330/25
180/25
82/25
330/6.3
330/6.3
330/6.3
330/6.3
330/6.3
330/6.3
220/10
220/10
220/10
220/10
220/10
220/10
100/10
100/10
100/16
100/16
100/16
100/16
100/16
100/16
68/20
390/6.3
390/6.3
390/6.3
390/6.3
390/6.3
390/6.3
330/10
330/10
330/10
330/10
330/10
330/10
270/10
270/10
180/16
180/16
120/20
120/20
180/16
120/20
68/25
7
10
40
6
2
3
10
40
8
5
10
15
40
9
2
3
20
40
15
18
30
40
15
20
40
12
2
Rev 2.4
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9
Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
XL2596 Series Buck Regulator Design Procedure (Adjustable Output)
Output
Voltage
(V)
Through Hole Output Electrolytic
Surface Mount Output Capacitor
Panasonic
HFQ Series
(uf/V)
Nichicon
PL Series
(uf/V)
Feedforward AVX TPS
Sprague
595D Series
(uf/V)
Feedforward
Capacitor
Capacitor
Series
(uf/V)
330/6.3
330/6.3
220/10
100/16
100/16
68/20
2
820/35
560/35
470/25
330/25
330/25
220/25
220/35
100/50
820/35
470/35
470/35
330/25
330/25
220/35
150/35
100/50
33nf
470/4
33nf
4
10nf
390/6.3
330/10
180/16
180/16
120/20
33/25
10nf
6
3.3nf
1.5nf
1nf
3.3nf
1.5nf
1nf
9
12
15
24
28
680pf
560pf
390pf
680pf
220pf
220pf
33/25
10/35
15/50
Schottky Diode Selection Table
Current Surface Through VR (The same as system maximum input voltage)
Mount Hole
20V
30V
40V
50V
60V
1N5817
1N5818
1N5819
1A
3A
√
1N5820
MBR320
SK32
1N5821
MBR330
SK33
1N5822
√
√
MBR340 MBR350
SK34 SK35
MBR360
SK36
√
√
30WQ03
31DQ03
SR303
30WQ04 30WQ05
31DQ04 31DQ05
√
√
SR302
SR304
SR305
SR306
1N5823
SR502
SB520
1N5824
SR503
1N5825
SR504
SB540
√
√
√
SR505
SB550
SR506
SB560
5A
SB530
50WQ03
50WQ04 50WQ05
√
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Typical System Application for 3.3V Version
Figure6. XL2596-3.3 System Parameters Test Circuit
Typical System Application for 5V Version
Figure7. XL2596-5.0 System Parameters Test Circuit
Rev 2.4
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Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Typical System Application for 12V Version
Figure8. XL2596-12 System Parameters Test Circuit
Typical System Application for ADJ Version
CFF 10n
R2 3.1K
R1 1K
FEEDBACK
L1 47uh/3A
4
VIN
OUTPUT
5V/3A
COUT
1 XL2596-ADJ 2
3
5
GND
ON/OFF
+24V
LOAD
CIN
470uf 50V
C1
105
D1
1N5821
470uf 35V
OFF
ON
VOUT=1.23*(1+R2/R1)
Figure9. XL2596-ADJ System Parameters Test Circuit
Rev 2.4
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12
Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Package Information
(1) TO220-5L
Rev 2.4
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13
Datasheet
XL2596
3A 150KHz 40V Buck DC to DC Converter
Package Information
(2) TO263-5L
Rev 2.4
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14
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