LM2575-15TB5T [FCI]
1.0A Step - Down Voltage Switching Regulators 1A output current; 1.0A步 - 向下压开关稳压器1A的输出电流
| 型号： | LM2575-15TB5T |
| 厂家： | 
FIRST COMPONENTS INTERNATIONAL |
| 描述： | 1.0A Step - Down Voltage Switching Regulators 1A output current |
| 文件： | 总10页 (文件大小：195K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM2575 1.0A Step - Down Voltage Switching Regulators
Features
Description
LM2575
for a step-
3.3V, 5V, 12V, 15V and Adjustable output
versions
of regulators provides all the active functions
down (buck) switching regulator, and drives
line and load regulation.
1A load with excellent
Adjustable version output voltage range
is available in fixed output volt ages of 3.3V,
LM2575
5V, 12V, 15V and
a
versatile Adjustable output
1.23V to 37V ±4% max over line and load
conditions
version. These regulators are simple to use and require
a minimum number of external components.
1A output current
Features include internal frequency compensation and
Requires Only 4 External Components
High Efficiency
TTL shutdown capability and low power
standby mode
Thermal shutdown, current limit protection
Uses standard inductors
LM2575 high-efficiency
a fixed- frequency oscillator.
replacement for popular three-terminal linear regulators,
and is requiring a smaller heat sink or even no heat sink.
performs well with standard inductors from
LM2575
several manufacturers, and simplifying the design of
switch-mode power supplies.
LM2575 guarantee +/-4%
tolerance on output voltage within specified input voltages
and output load conditions, and ±10% on the oscillator
frequency.
52 kHz fixed frequency internal oscillator
External shutdown is included with 50 uA(typical)
standby current. The output switch has cycle-by-cycle
current limiting as well as thermal shutdown for full
protection under fault conditions.
Application
Pre-regulator for linear regulators
On-card/ board switching regulators
High-efficiency step-down buck regulator
Positive to negative converter (buck-boost)
TYPICAL APPLICATION
Feedback
7V - 40V
Unregulated
DC Input
4
+V
IN
LM2575 -5.0
L1
5.0V, 1A
1
Output
2
Regulated
Output
C
+
IN
+
330 µH
C
OUT
3 GND
5
ON / OFF
100 µF
330 µF
D1
1N5819
LM2575 1.0A Step - Down Voltage Switching Regulators
MARKING INFORMATION & PIN CONFIGURATIONS
2
TO-220- 5
TO-220- 5B
TO-252-5 (DPAK)
TO-263-5(D PAK)
V
IN
Output
ON/OFF
Feedback
V
V
V
IN
Output
Ground
IN
IN
Ground
Output
ON/OFF
Feedback
ON/OFF
Feedback
Output
Ground
ON/OFF
Feedback
Ground
V V, VVV = Output Voltage (33=3.3V , 120=12V,A=Adj)
A
= Assembly Location
= Year
1
2 3 4 5
Y
W W
= Weekly
ORDERING INFORMATION
Ordering Number
Output Voltage
Package
Shipping
A d j
A d j
A d j
A d j
3.3
3.3
3.3
3.3
5.0
5.0
5.0
5.0
5.0
5.0
12
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
TO-252-5
TO-252-5
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
TO-220-5
TO-220-5B
TO-263-5
TO-263-5
50 Units / Tube
50 Units / Tube
LM2575-ATB5T
LM2575-ATB5BT
LM2575-ATA5R
LM2575 -ATA5T
800 Units/ Tape & Reel
50 Units / Tube
50 Units / Tube
-3.3TB5T
LM2575
LM2575 -3.3TB5BT
50 Units / Tube
800 Units/ Tape & Reel
LM2575
-3.3TA5R
LM2575
-3.3TA5T
50 Units / Tube
50 Units / Tube
-5.0TB5T
LM2575
-5.0TB5BT
50 Units / Tube
LM2575
800 Units/ Tape & Reel
LM2575-5.0TA5R
-5.0TA5T
50 Units / Tube
80 Units/ Tube
LM2575
LM2575-5.0TC5T
2,500 Units/ Tape & Reel
-5.0TC5R
LM2575
LM2575
-12TB5T
50 Units / Tube
50 Units / Tube
-12TB5BT
12
LM2575
800 Units/ Tape & Reel
LM2575
-12TA5R
12
LM2575
-12TA5T
12
50 Units / Tube
50 Units / Tube
LM2575
-15TB5T
15
LM2575
-15TB5BT
15
50 Units / Tube
800 Units/ Tape & Reel
LM2575
-15TA5R
15
LM2575
-15TA5T
15
50 Units / Tube
* TB5B: Bent and Staggered Leads of TO-220 package
** For detail Ordering Number identification, please see last page.
LM2575 1.0A Step - Down Voltage Switching Regulators
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE
UNIT
Maximum Supply Voltage
45
V
V
-0.3
V V
IN
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
-1.0
V
-
Power Dissipation
Internally Limited
-65 to + 150
+150
Storage Temperature Range
Maximum Junction Temperature
Lead Temperature (Soldering, 10 sec.)
°C
°C
°C
+260
RECOMMENDED OPERATING CONDITIONS
PARAMETER
VALUE
UNIT
-40
T
J
125
Temperature Range
°C
Supply Voltage
40
V
BLOCK DIAGRAM
Unregulated
V
IN
DC Input
ON/OFF
Internal
Regulator
ON/OFF
1
4
5
+
C
IN
Feed-
back
R2
Fixed Gain
Error AMP
Comparator
1 AMP
Switch
+
-
+
-
1.0K
R1
Output
Driver
L1
V
OUT
2
D1
+
1.23V
L
Band-Gap
Reference
52kHz
Oscillator
Thermal
Shutdown
C
Current
Limit
O
A
D
out
Reset
3
GND
V
OUT
3.3V, R2 = 1.7K
5V, R2 = 3.1K
12V, R2 = 8.84K
15V, R2 = 11.3K
For ADJ. Version
R1 = Open, R2 = 0W
LM2575 1.0A Step - Down Voltage Switching Regulators
LM2575-3.3
(Specifications with standard type face are for T = 25°C, and those with boldface type apply over full Operating Temperature Range)
ELECTRICAL CHARACTERISTICS:
J
Conditions
Parameter
Unit
Symbol
Min
Typ
Max
Output Voltage
Output Voltage
Efficiency
V
IN
= 12V, I
= 0.2A
V
3.234
3.3
3.3
75
3.366
V
V
LOAD
OUT
4.75V
V
40V, 0.2A
I
1A
V
3.168/3.135
3.432/3.465
IN
LOAD
OUT
h
-
-
V
IN
= 12V, I
= 1A
%
LOAD
LM2575-5.0
(Specifications with standard type face are for T = 25°C, and those with boldface type apply over full Operating Temperature Range)
ELECTRICAL CHARACTERISTICS:
J
Conditions
Parameter
Unit
Symbol
Min
Typ
Max
Output Voltage
Output Voltage
Efficiency
V
IN
= 12V, I
= 0.2A
V
4.900
5.0
5.0
77
5.100
V
V
LOAD
OUT
8V
V
40V, 0.2A
I
1A
V
4.800/4.750
5.200/5.250
IN
LOAD
OUT
h
-
-
V
IN
= 12V, I
= 1A
%
LOAD
LM2575-12
(Specifications with standard type face are for T = 25°C, and those with boldface type apply over full Operating Temperature Range)
ELECTRICAL CHARACTERISTICS:
J
Conditions
Parameter
Unit
Symbol
Min
Typ
Max
Output Voltage
Output Voltage
Efficiency
V
IN
= 25V, I
= 0.2A
V
11.76
12.0
12.0
88
12.24
V
V
LOAD
OUT
15V
V
40V, 0.2A
I
1A
V
11.52/11.40
12.48/12.60
IN
LOAD
OUT
h
-
-
V
IN
= 15V, I
= 1A
%
LOAD
LM2575-15
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
ELECTRICAL CHARACTERISTICS:
Conditions
Parameter
Unit
Symbol
Min
Typ
Max
Feedback Voltage
Feedback Voltage
Efficiency
V
IN
= 30V, I
= 0.2A
V
14.70
15.0
15.0
88
15.30
V
V
LOAD
OUT
18V
V
40V, 0.2A
I
1A
V
14.40/14.25
15.60/15.75
IN
IN
LOAD
OUT
h
-
-
V
= 18V, I
= 1A
%
LOAD
LM2575-adj
(Specifications with standard type face are for T = 25°C, and those with boldface type apply over full Operating Temperature Range)
ELECTRICAL CHARACTERISTICS:
J
Conditions
Parameter
Unit
Symbol
Min
Typ
Max
Feedback Voltage
V
= 12V, I
= 0.2A, V
= 5V
V
1.217
1.230
1.243
V
IN
LOAD
OUT
OUT
8V
V
40V, 0.2A
V = 5V
OUT
I
1A
IN
LOAD
Feedback Voltage
V
1.193/1.180
1.230
1.267/1.280
V
OUT
h
-
-
V
IN
= 12V, I
= 1.0A, V =5V
OUT
Efficiency
77
%
LOAD
4
LM2575 1.0A Step - Down Voltage Switching Regulators
ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(Specifications with standard type face are for T = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise
J
specified, V = 12V for the 3.3V, 5.0V andADJ version, V = 25V for 12V version. and V = 30V for 15V version. I = 500 mA)
LOAD
IN
IN
IN
Symbol
Typ
Parameter
Conditions
= 5V (Adjustable Version Only)
(Note 11)
Min
Max
Unit
-
V
OUT
I
FB
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
50
52
100 / 500
nA
kHz
V
F
O
47 / 42
58 / 63
-
I
= 1A (Notes 4)
V
0.9
1.2 / 1.4
OUT
SAT
-
T
DC
Max Duty Cycle (ON)
(Note 5)
93
98
%
(Note 4, 11)
I
CL
Current Limit
1.7 / 1.3
2.2
3.0 / 3.2
A
-
-
-
(Notes 6, 7)
Output = 0 V
Output = -1V
2
I
OL
Output Leakage Current
mA
7.5
30
-
-
(Note 6)
I
Q
Quiescent Current
5
10
mA
Standby Quiescent Current
I
mA
ON/OFF Pin = 5V (OFF)
50
200
STBY
q
-
-
-
-
-
TO-220 Package, Junction to Ambient (Note 8)
TO-220 Package, Junction to Ambient (Note 8)
TO-220,TO-263, Package, Junction to Case
TO-252 Package, Junction to Case
JA
65
45
2
-
-
-
-
q
JA
q
Thermal Resistance
°C/W
JC
q
6
JC
q
TO-263 Package, Junction to Ambient (Note 10)
37
JA
-
V
OUT
=0V
V
2.2 / 2.4
1.4
1.2
12
0
V
V
ON/OFF Pin
IH
V
= Nominal Output Voltage
Logic Input Level
V
-
-
-
OUT
1.0 / 0.8
IL
V
mA
mA
30
ON/OFF Pin = 5V (OFF)
IH
ON/OFF Pin Input Current
I
IL
ON/OFF Pin = 0V (ON)
10
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indic
ate conditions for which the device is intended to be functional, but do not guarantee specific performance limits.
Guaranteed specifications and Test conditions are shown in Electrical Characteristics.
Note 2: All limits guaranteed at 25°C (standard type face) and over full operating temperature range (bold type face).
All 25°C limits are 100% production tested. All limits over full operating temperature range are guaranteed via
correlation using standard Statistics Quality Control methods.
Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator
LM2575 is used as show in the Figure 2 test circuit, system performance will be
system performance. When the
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: V = 40V
IN
Note 8: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
with ½ inch leads in a socket, or on a PC board with minimum copper area.
Note 9: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
with ¼ inch leads soldered to a PC board containing approximately 4 square inches of copper area surrounding
the leads.
Note 10: If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board Copper area
thermally connected to the package. Using 0.5 square inches of copper area, q is 50°C//W, with 1 square inch
JA
of copper area, q is 37°C/W, and with 1.6 or more square inches of copper area, q is 32°C/W.
JA
JA
Note 11: 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
LM2575 By lowering the minimum duty cycle from
5% down to approximately 2%.
5
LM2575 1.0A Step - Down Voltage Switching Regulators
TEST CIRCUIT AND LAYOUT GUIDELINES
Careful layout is important with any switching regulator. Rapidly switching currents associated with wiring
inductance generate voltage transients, which can cause problems. To minimize inductance and ground loops,
the lengths of the leads indicated by heavy lines in Figure 1 below should be kept as short as possible. Single-
point grounding (as indicated in Figure 1) or ground plane construction should be used for best results. When
LM2575, to keep the
using the Adjustable version, place the programming resistors as close as possible to
sensitive feedback wiring short.
Figure 1(a). Fixed Output Voltage Versions
Feedback
4
LM2575
+V
IN
FIXED OUTPUT
L1
1
VOUT
Output
2
330 µH
GND 3
ON/OFF 5
V
IN
+
+
L
Unregulated
DC Input
D1
MBR360
C
O
A
D
IN
100 µF
C
OUT
330 µF
C - 100 µF, 75V,Aluminum Electrolytic
IN
C
- 330 µF, 25V,Aluminum Electrolytic
OUT
D1 - Schottky, MBR360
L1 - 330 µH, 3L Electronic Corp. TC-331M-1.0A- 5026
R1 - 2k, 0.1%
R2 - 6.12k, 0.1%
6
LM2575 1.0A Step - Down Voltage Switching Regulators
Figure 1(b).Adjustable Output Voltage Versions
Feedback
4
+V
IN
LM2575-adj
L1
V
=5.0V
1
Output
OUT
2
330 µH
ON/ OFF
GND 3
5
R2
7V - 40V
Unregulated
DC Input
+
L
O
A
D
+
D1
MBR360
C
IN
C
100 µF
OUT
330 µF
R1
R2
V
= V
( 1 +
)
OUT
REF
R1
-1)
V
OUT
R2 = R1 (
V
REF
where V
= 1.23V, R1 between 1k and 5k.
REF
Typical Performance Characteristics
Figure 2. Switch Saturation Voltage
Figure 3. Dropout Voltage
1.2
2.0
1.5
1.0
0.5
0
DV
= 5%
OUT
R
= 0.2W
IND
T = - 55°C
J
I
= 1A
1.0
LOAD
T = - 25°C
J
0.8
T = 150°C
J
I
= 200mA
LOAD
0.6
0.4
0
0.2
0.4
0.6
0.8
1.0
-75 -50 -25
0
25 50 75 100 125 150
SWITCH CURRENT (A)
JUNCTION TEMPERATURE (°C)
LM2575 1.0A Step - Down Voltage Switching Regulators
Typical Performance Characteristics
Figure 5. Maximum Power Dissipation(TO-263)
Figure 4. Quiescent Current
20
V
= 5V
OUT
Measured at
Ground Pin
18
16
14
12
10
8
4
3
2
1
0
q
= 32°C/ W
JA
T = 25°C
J
q
= 37°C/ W
JA
I
= 1A
LOAD
q
= 50°C/ W
JA
6
I
= 200mA
q
= 73°C/ W
LOAD
JA
4
0
10
20
30
40
50
60
0
10 20 30 40 50 60 70 80 90 100
AMBIENT TEMPERATURE (°C)
INPUT VOLTAGE (V)
Figure 7. ON / OFF Pin Current (Sinking)
Figure 6. Minimum Operating Voltage
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
8
Adjustable Version Only
V
= 40V
IN
7
6
5
4
3
2
1
0
-40°C
T
J
125°C
V
OUT
= 1.23V
I
= 120 mA
LOAD
-50 -25
0
25 50
75 100 125
0
5
10
15
20
25
JUNCTION TEMPERATURE (°C)
ON / OFF PIN VOLTAGE (V)
8
LM2575 1.0A Step - Down Voltage Switching Regulators
TO-220-5 PACKAGE OUTLINE DIMENSIONS
9.97 ± 0.20
4.50 ± 0.20
9.90 ± 0.20
8.0 ± 0.20
3.60 ± 0.20
7.0
8.70
+0.1
2.80 ± 0.10
1.30
-0.05
1.30 ± 0.10
1.70
3.70 ± 0.20
1.50 DP0.20
3°
4.60
7.0 ± 0.20
9.20 ± 0.20
8.40
3°
3°
1.2
3-R0.2
5-0.8 ± 0.10
+0.1
0.50
-0.05
2.40 ± 0.20
1.7(TYP)
3°
3°
2 - R 0.3
Unit: mm
10.00 ± 0.20
TO-263-5 PACKAGE OUTLINE DIMENSIONS
9.90
4.50
1.30
15°
0.40
1.20
3°
4.60
1.50 DP0.20
9.20
Pad Layout
0.10
3°
15.3
17.5
2.00
0.75
9
2.40
3.8
1.20
R0.30
4.90
1.7
R0.30
2.54
0.50
10.0
1.70 TYP
(1.70 ± 0.20)
0.80
8.0
7.0
1.07
0.40
4.40
1.75
3°
3°
R 0.3
0.90
R 0.45
7.2
Units: mm
9.20
15.30
10.00
4.90
9
Unit: mm
LM2575 1.0A Step - Down Voltage Switching Regulators
TO-220-5B PACKAGE OUTLINE DIMENSIONS
0.18 ± 0.004
4.57 ± 0.1
0.4 ± 0.006
0.05 ± 0.004
10.16 ± 0.15
1.27 ± 0.1
0.108 ± 0.006
0.151 ± 0.002
2.74 ± 0.15
3.84 ± 0.05
0.05 ± 0.004
1.27 ± 0.1
0.4985 ± 0.0075
0.358 ± 0.008
12.66 ± 0.2
9.1± 0.2
0.032 ± 0.004
0.81 ± 0.1
0.9645 ± 0.0075
24.5 ± 0.2
0.996 ± 0.008
25.3± 0.2
0.138 ± 0.004
3.5 ± 0.1
0.105 ± 0.006
2.76± 0.15
0.1535 ± 0.0035
3.9 ± 0.1
0.213 ± 0.004
5.4 ± 0.1
0.173 ± 0.006
4.4 ± 0.15
0.220 TYP
1.700 TYP
0.0165 ± 0.0045
0.42 ± 0.11
0.331 ± 0.006
8.4 ± 0.15
0.268 ± 0.004
0.68 ± 0.1
Inches
(
)
mm
TO-252-5 PACKAGE OUTLINE DIMENSIONS
0.256 ± 0.004
6.5 ± 0.1
0.212 ± 0.003
0.024 Ref
Pad Layout
0.02 ± 0.001
5.375 ± 0.075
0.600 Ref
0.51 ± 0.02
29° ± 0.5°
7
3
0.24 ± 0.004
0.039 ± 0.002
6.10 ± 0.1
1.0 ± 0.05
0.9
0.2835 ± 0.0035
7.20 ± 0.1
0.39 ± 0.008
9.9 ± 0.2
7
1.27
0.025 ± 0.002
0.06 ± 0.004
6.25
0.64 ± 0.05
1.525 ± 0.1
0.0235 ± 0.0015
0.60 ± 0.025
0.003 ± 0.002
0.050BSC
Units: mm
0.07 ± 0.05
1.270BSC
0.091 ± 0.002
2.3 ± 0.05
Inches
(
)
mm
10
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