PL2576-12F5 [CYSTEKEC]
Simple Switcher 3A Step- Down Voltage Regulator; SIMPLE SWITCHER 3A降压稳压器
| 型号： | PL2576-12F5 |
| 厂家： | 
CYSTECH ELECTONICS CORP. |
| 描述： | Simple Switcher 3A Step- Down Voltage Regulator |
| 文件： | 总10页 (文件大小：224K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 1/10
Simple Switcher
3A Step- Down Voltage Regulator
PL2576-XXXF5
Features
ꢀ3.3V, 5V, 12V, 15V, and adjustable output versions.
ꢀAdjustable version output voltage range, 1.23V to 37V±4% max over line
and load conditions.
TO-263-5L
ꢀGuaranteed 3A output current.
ꢀWide input voltage range.
ꢀRequires only 4 external components
ꢀ52 kHz fixed frequency oscillator
ꢀTTL shutdown capability, low power standby mode.
ꢀHigh efficiency
ꢀUses readily available standard inductors.
ꢀThermal shutdown and current limit protection.
Description
The PL2576-XXXF5 series of regulators are monolithic integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation.
These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include internal
frequency compensation and a fixed-frequency oscillator.
The PL2576-XXXF5 series offers a high-efficiency replacement for popular three-terminal linear regulators. It
substantially reduces the size of the heat sink, and in some cases no heat sink is required.
A standard series if inductors optimized for use with the PL2576 are available from several different
manufacturers. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output
load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50µA (typical)
standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
Applications
ꢀ
ꢀ
ꢀ
ꢀ
Simple high-efficiency step-down (buck) regulator.
Efficient pre-regulator for linear regulators.
On-card switching regulators.
Positive to negative converter (Buck-Boost).
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 2/10
Typical Application (Fixed Output Voltage Version)
7V-40V unregulated
DC input
Feedback
+VIN
1
+5V regulated output
3A load
4
L1
PL2576-5.0
Output
2
μ
100 H
+
+
Cin
D1
Cout
3 GND 5
ON/OFF
μ
100 F
1N5822
μ
1000 F
Figure. 1
Block Diagram
Vin
Unregulated
DC Input
ON/OFF
Internal
Regulator
1
5
ON / OFF
Feedback
4
+
Cin
Fixed Gain
Error Amp
R2
Comparator
3 Amp
Switch
Driver
1.0k
R1
Vout
L1
Output
GND
2
3
Cout
Current
Limit
Thermal
Reset
+
1.23V
52kHz
L
Shutdown
band-gap
reference
Oscillator
D1
O
A
D
3.3V, R2=1.7k
5V, R2=3.1k
12V, R2=8.84k
15V, R2=11.3k
For Adjustable version, R1=open, R2=0
Ordering Information
Temperature
Output Voltage
12
Package
Type
Range
3.3
5.0
15
ADJ
-40℃≤TA≤125℃
PL2576-3.3F5 PL2576-5.0F5 PL2576-12F5 PL2576-15F5 PL2576-ADJF5 TO-263-5L
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 3/10
Absolute Maximum Ratings (Note 1)
Maximum supply voltage ………………………………………………………………………………………………45V
ON/OFF pin input voltage …………………………………………………………………………………-0.3V≤V≤+VIN
Output voltage to ground (steady state)…………………………………………………………………………………-1V
Power dissipation ………………………………………………………………………………………. Internally limited
Storage temperature range…………………………….…………………………………………………..-65°C to +150°C
Maximum junction temperature……. ……………………………………………………………………………….150°C
Minimum ESD rating (C=100pF, R=1.5kΩ)……………………………………………………………………2kV
Lead temperature (Soldering, 10 seconds)……………………………………………………………….. …………260°C
Operating Ratings
Temperature range…………………………………………………………………………………. .-40°C ≤ TJ ≤ +125°C
Supply voltage…………………………………………………………………………………………………………40V
PL2576-3.3 Electrical Characteristics
Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full
operating temperature range
Symbol
Parameter
Conditions
Typ
Min
Max
Units
System Parameters
Test Circuit
(Note 3)
Figure 2
Output Voltage VIN=12V, ILOAD=0.5A
Circuit of Figure 2
3.3
3.3
3.234
3.336
V
V
VOUT
6V≤VIN≤40V, 0.5A≤ILOAD≤3A
3.168/3.135 3.432/3.465
VOUT
Output Voltage
Efficiency
Circuit of Figure 2
η
VIN=12V, ILOAD=3A
75
%
PL2576-5.0 Electrical Characteristics
Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full
operating temperature range
Symbol
Parameter
Conditions
Typ
Min
4.9
Max
5.1
Units
System Parameters
Test Circuit
(Note 3)
Figure 2
Output Voltage VIN=12V, ILOAD=0.5A
Circuit of Figure 2
5.0
3.3
V
V
VOUT
8V≤VIN≤40V, 0.5A≤ILOAD≤3A
4.800/4.750 5.200/5.250
VOUT
Output Voltage
Efficiency
Circuit of Figure 2
η
VIN=12V, ILOAD=3A
77
%
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 4/10
PL2576-12 Electrical Characteristics
Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full
operating temperature range
Symbol
Parameter
Conditions
Typ
Min
Max
Units
System Parameters
Test Circuit
(Note 3)
Figure 2
Output Voltage VIN=25V, ILOAD=0.5A
Circuit of Figure 2
12
12
11.76
12.24
V
V
VOUT
15V≤VIN≤40V, 0.5A≤ILOAD≤3A
11.52/11.40
12.48/12.60
VOUT
Output Voltage
Efficiency
Circuit of Figure 2
η
VIN=15V, ILOAD=3A
88
%
PL2576-15 Electrical Characteristics
Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full
operating temperature range
Symbol
Parameter
Conditions
Typ
Min
14.7
Max
15.3
Units
System Parameters
Test Circuit
(Note 3)
Figure 2
Output Voltage VIN=25V, ILOAD=0.5A
Circuit of Figure 2
15
V
V
VOUT
18V≤VIN≤40V, 0.5A≤ILOAD≤3A
3.3
14.40/14.25 15.60/15.75
VOUT
Output Voltage
Efficiency
Circuit of Figure 2
η
VIN=18V, ILOAD=3A
88
%
PL2576-ADJ Electrical Characteristics
Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full
operating temperature range
Symbol
Parameter
Conditions
Typ
Min
Max
Units
System Parameters
Test Circuit
(Note 3)
Figure 2
Feedback
VOUT
VIN=12V, ILOAD=0.5A,
1.230
1.217
1.243
V
V
Voltage
V
OUT=5V, Circuit of Figure 2
8V≤VIN≤40V, 0.5A≤ILOAD≤3A
OUT=5V, Circuit of Figure 2
VIN=12V, ILOAD=3A,
OUT=5V
1.230 1.193/1.180 1.267/1.280
Feedback
VOUT
V
Voltage
η
Efficiency
77
%
V
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 5/10
All Output Voltage Versions Electrical Characteristics
Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full
operating temperature range. Unless otherwise specified, VIN=12V for the 3.3V, 5.0V, and adjustable versions,
VIN=25V for the 12V version, and VIN=30V for the 15V version. ILOAD=500mA.
Symbol
Parameter
Conditions
Typ
50
52
1.4
Min
-
Max
Units
nA
kHz
V
Feedback bias current
Oscillator frequency
100/500
58/63
1.8/2.0
Ib
fO
VOUT=5V (adjustable version only)
(Note 8)
IOUT=3A (Note 4)
(Note 5)
47/42
VSAT Saturation voltage
-
Maximum duty cycle
DC
98
93
-
%
A
(ON)
(Notes 4, 8)
ICL
IL
Current limit
5.8
4.2/3.5
6.9/7.5
(Notes 6, 7) Output = 0V
-
-
2
Output leakage current
Quiescent current
mA
mA
µA
Output = -1V
7.5
-
30
(Note 6)
IQ
5
-
-
10
Standby quiescent
ISTBY
50
200
ON/OFF pin=5V (OFF)
current
ON/OFF Control
VIH
VOUT=0V
1.4
1.2
2.2/2.4
-
V
V
ON/OFF pin logic
VIL
VOUT=Nominal output voltage
-
1.0/0.8
input level
IIH
12
0
-
-
30
10
µA
µA
ON/OFF pin input
ON/OFF pin=5V (OFF)
ON/OFF pin=0V (ON)
current
IIL
Note 1 : Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate
conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed
specifications and test conditions, see the Electrical Characteristics.
Note 2 : All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face).
Note 3 : External components such as the catch diode, inductor, input and output capacitors can affect switching regulator
system performance. When the PL2576 is used as shown in the figure 2 test circuit, system performance will be as shown in
system parameters section of Electrical Characteristics.
Note 4 : Output pin sourcing current. No diode, inductor or capacitor connected to output.
Note 5 : Feedback pin removed from output and connected to 0V.
Note 6 : Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for
the 12V and 15V versions, to force the output transistor OFF.
Note 7 : VIN=40V.
Note 8 : The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes
the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the
average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 6/10
Typical Performance Characteristics (circuit of Figure 2)
Normalized Output Voltage
Line Regulation
1
0.8
0.6
0.4
0.2
0
1.4
1.2
1
LOAD
J
I
= 500mA,
IN
V = 20V,I
LOAD
J
= 500mA
T = 25℃
Normalized at T = 25℃
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
3.3V, 5V & ADJ
12V & 15V
-0.2
-0.4
-0.6
0
10
20
30
40
50
-50
-25
0
25
50
75
100 125
Input Voltage(V)
Junction Temperature(℃)
Dropout Voltage
Standby Quiescent Current
1.75
1.5
1.25
1
200
175
150
125
100
75
LOAD
I
=3A
VIN=40V
LOAD
I
=1A
ON/OFF
V
= 5V
0.75
0.5
0.25
0
LOAD
I
=0.2A
50
1
L = 150μH
VIN=12V
Rind = 0.1Ω
25
0
-50
-25
0
25
50
75
100 125
-75 -50 -25
0
25 50 75 100 125 150
Junction Temperature(℃)
Junction Temperature(℃)
Current Limit
Quiescent Current
20
18
16
14
12
10
8
6.5
6
IN
V =25V
OUT
V
= 5V, measured
J
at ground pin, T = 25℃
5.5
5
LOAD
I
=3A
4.5
4
6
LOAD
I
=0.2A
4
-75 -50 -25
0
25 50 75 100 125 150
0
10
20
30
40
50
Input Voltage (V)
Junction Temperature (℃)
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 7/10
Switch Saturation Voltage
Efficiency
1.6
1.4
1.2
1
95
90
85
80
75
70
65
60
LOAD
I
= 3A
-55℃
15V OUT
LOAD
I
= 0.2A
0.8
0.6
0.4
0.2
0
5V
25℃
LOAD
I
= 3A
150℃
LOAD
I
= 0.2A
40
J
T = 25℃
0
10
20
30
50
0
0.5
1
1.5
2
2.5
3
Switch Current (A)
Input Voltage (V)
Oscillator Frequency
Minimum Operating Voltage
8
6
5
4.5
4
Adjustable version only
Normalized at 25℃
4
3.5
3
2
0
2.5
2
-2
-4
-6
-8
IN
V = 40V
1.5
1
OUT
V
≒1.23V
= 0.5A
LOAD
I
IN
V = 12V
0.5
0
-75 -50 -25
0
25 50 75 100 125 150
-50
-25
0
25
50
75
100 125
Junction Temperature (℃)
Junction Temperature (℃)
Feedback Voltage vs Duty Cycle
Quiescent Current vs Duty Cycle
20
15
10
5
20
17.5
15
Adjustable version only
Adjustable version only
LOAD
I
= 0.5A
LOAD
I
= 0.5A
12.5
10
IN
V =40V
IN
V =7V
0
7.5
5
-5
IN
V =40V
-10
-15
-20
IN
V =7V
2.5
0
0
20
40
60
80
100
0
20
40
60
80
100
Duty Cycle (%)
Duty Cycle (%)
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 8/10
Minimum Power Dissipation
Feedback Pin Current
100
75
5
4.5
4
Adjustable version only
JA
θ = 32℃/W
50
3.5
3
JA
θ = 37℃/W
25
JA
θ = 50℃/W
2.5
2
0
-25
-50
-75
-100
1.5
1
0.5
0
JA
θ = 73℃/W
0
10 20 30 40 50 60 70 80 90 100
Ambient Temperature (℃)
-75 -50 -25
0
25 50 75 100 125 150
Junction Temperature (℃)
Switching Waveforms
Load Transient Response
50V
A
0
100mV
Output
Voltage
Change
0
4A
2A
0
-100mV
B
3A
2A
4A
2A
0
Load
Current
C
D
1A
0
μ
100 s / div
μ
5
s/ div
VOUT=15V
A : Output Pin Voltage, 50 V / div
B : Output Pin Current, 2A / div
C : Inductor Current, 2A / div
D : Output Ripple Voltage, 50mV / div
AC Coupled
μ
Horizontal Time Base : 5 s / div
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 9/10
Test Circuit and Layout Guidelines
As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring
inductance generate voltage transients which can cause problems. For minimal inductance and ground
loops, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point
grounding (as indicated) or ground plane construction should be used for best results. When using the
Adjustable version, physically locate the programming resistors near the regulator, to keep the sensitive
feedback wiring short.
Fixed Output Voltage Versions
Feedback
4
PL2576
+Vin
1
Fixed Output
Vout
L1
Output
2
μ
100
H
Vin
Cin
100
Unregulated
DC Input
+
+
Cout
1000
GND
3
ON / OFF
5
L
μ
F
D1
MBR360
μ
F
O
A
D
μ
Cin--100 F, 75V, Aluminum Electrolytic
μ
Cout--1000 F, 25V, Aluminum Electrolytic
D1--Schottky, MBR360
μ
L1--100 H, Pulse Eng, PE92108
R1--2k, 0.1%
R2--6.12k, 0.1%
Adjustable Output Voltage Version
Feedback
4
+Vin
PL2576-ADJ
Vout
1
L1
Output
2
5.00V
μ
100
H
7V-40V
R2
R1
Unregulated
DC Input
+
+
Cin
100
Cout
1000
GND
3
ON / OFF
5
L
D1
MBR360
μ
F
μ
F
O
A
D
R2
R1
Vout=VREF(1+
Vout
)
-1)
R2=R1(
VREF
where VREF=1.23V, R1 between 1k and 5k
Figure 2
PL2576-XXXF5
CYStek Product Specification
Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
CYStech Electronics Corp.
Page No. : 10/10
TO-263-5L Dimension
Marking:
2576-XXX
Style: Pin 1.Vin 2.Vout 3.GND
4.Feedback 5.ON/OFF
5-Lead TO-263-5L Plastic Package
CYStek Package Code: F5
*: Typical
Inches
DIM
Millimeters
Inches
Millimeters
DIM
Min.
0.176
0
Max.
0.184
0.006
0.069
0.036
0.021
0.054
0.401
Min.
Max.
4.67
Min.
Max.
Min.
Max.
A
A1
B
4.47
0
E
e
0.323
0.339
0.820
0.860
0.150
1.760
0.910
0.530
1.370
10.180
0.067(typical)
1.700(typical)
0.061
0.028
0.012
0.046
0.389
1.560
0.710
0.310
1.170
9.880
e1
L
0.264
0.596
0.200
0.092
0.272
0.612
0.216
0.108
0.670
15.140
5.080
2.340
0.690
15.540
5.480
2.740
b
c
L1
L2
V
c1
D
0.220REF
5.600REF
Notes: 1.Controlling dimension: inch
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.
Material:
• Lead: 42 Alloy ; solder plating
• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0
Important Notice:
• All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek.
• CYStek reserves the right to make changes to its products without notice.
• CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
• CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
PL2576-XXXF5
CYStek Product Specification
相关型号：
PL257CS
Rectangular Connector Adapter, 25 Contacts(Side1), 25 Contacts(Side2), Panel Mount, Female-Female
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