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PDF 2575T-12 Data sheet ( Hoja de datos )
| Número de pieza | 2575T-12 | |
| Descripción | LM2575 | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 2575T-12 (archivo pdf) en la parte inferior de esta página. Total 27 Páginas | ||
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August 2004
LM1575/LM2575/LM2575HV
SIMPLE SWITCHER® 1A Step-Down Voltage Regulator
General Description
The LM2575 series of regulators are monolithic integrated
circuits that provide all the active functions for a step-down
(buck) switching regulator, capable of driving a 1A load with
excellent line and load regulation. These devices are avail-
able 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 LM2575 series offers a high-efficiency replacement for
popular three-terminal linear regulators. It substantially re-
duces the size of the heat sink, and in many cases no heat
sink is required.
A standard series of inductors optimized for use with the
LM2575 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 out-
put voltage within specified input voltages and output load
conditions, and ±10% on the oscillator frequency. External
shutdown is included, featuring 50 µA (typical) standby cur-
rent. The output switch includes cycle-by-cycle current limit-
ing, as well as thermal shutdown for full protection under
fault conditions.
Features
n 3.3V, 5V, 12V, 15V, and adjustable output versions
n Adjustable version output voltage range,
1.23V to 37V (57V for HV version) ±4% max over
line and load conditions
n Guaranteed 1A output current
n Wide input voltage range, 40V up to 60V for HV version
n Requires only 4 external components
n 52 kHz fixed frequency internal oscillator
n TTL shutdown capability, low power standby mode
n High efficiency
n Uses readily available standard inductors
n Thermal shutdown and current limit protection
n P+ Product Enhancement tested
Applications
n Simple high-efficiency step-down (buck) regulator
n Efficient pre-regulator for linear regulators
n On-card switching regulators
n Positive to negative converter (Buck-Boost)
Typical Application (Fixed Output Voltage
Versions)
Note: Pin numbers are for the TO-220 package.
01147501
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS011475
www.national.com
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Maximum Supply Voltage
LM1575/LM2575
LM2575HV
ON /OFF Pin Input Voltage
Output Voltage to Ground
(Steady State)
Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
45V
63V
−0.3V ≤ V ≤ +VIN
−1V
Internally Limited
−65˚C to +150˚C
150˚C
Minimum ESD Rating
(C = 100 pF, R = 1.5 kΩ)
Lead Temperature
(Soldering, 10 sec.)
Operating Ratings
Temperature Range
LM1575
LM2575/LM2575HV
Supply Voltage
LM1575/LM2575
LM2575HV
2 kV
260˚C
−55˚C ≤ TJ ≤ +150˚C
−40˚C ≤ TJ ≤ +125˚C
40V
60V
LM1575-3.3, LM2575-3.3, LM2575HV-3.3
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range .
Symbol
Parameter
Conditions
Typ LM1575-3.3 LM2575-3.3 Units
LM2575HV-3.3 (Limits)
Limit
Limit
(Note 2)
(Note 3)
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
VOUT
Output Voltage
VIN = 12V, ILOAD = 0.2A
Circuit of Figure 2
3.3
3.267
3.234
V
V(Min)
3.333
3.366
V(Max)
VOUT
Output Voltage
LM1575/LM2575
4.75V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 1A
Circuit of Figure 2
3.3
3.200/3.168
3.168/3.135
V
V(Min)
3.400/3.432 3.432/3.465 V(Max)
VOUT
Output Voltage
LM2575HV
4.75V ≤ VIN ≤ 60V, 0.2A ≤ ILOAD ≤ 1A
Circuit of Figure 2
3.3
3.200/3.168
3.168/3.135
V
V(Min)
3.416/3.450 3.450/3.482 V(Max)
η Efficiency
VIN = 12V, ILOAD = 1A
75
%
LM1575-5.0, LM2575-5.0, LM2575HV-5.0
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range.
Symbol
Parameter
Conditions
Typ LM1575-5.0
LM2575-5.0
Units
LM2575HV-5.0 (Limits)
Limit
Limit
(Note 2)
(Note 3)
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
VOUT
Output Voltage
VIN = 12V, ILOAD = 0.2A
Circuit of Figure 2
5.0
4.950
4.900
V
V(Min)
5.050
5.100
V(Max)
VOUT
Output Voltage
LM1575/LM2575
0.2A ≤ ILOAD ≤ 1A,
8V ≤ VIN ≤ 40V
Circuit of Figure 2
5.0
4.850/4.800
5.150/5.200
4.800/4.750
5.200/5.250
V
V(Min)
V(Max)
VOUT
Output Voltage
LM2575HV
0.2A ≤ ILOAD ≤ 1A,
8V ≤ VIN ≤ 60V
Circuit of Figure 2
5.0
4.850/4.800
5.175/5.225
4.800/4.750
5.225/5.275
V
V(Min)
V(Max)
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Typical Performance Characteristics (Circuit of Figure 2) (Continued)
Feedback Pin Current
Maximum Power Dissipation
(TO-263) (See (Note 12))
Switching Waveforms
01147505
01147528
Load Transient Response
VOUT = 5V
A: Output Pin Voltage, 10V/div
B: Output Pin Current, 1A/div
C: Inductor Current, 0.5A/div
D: Output Ripple Voltage, 20 mV/div,
AC-Coupled
Horizontal Time Base: 5 µs/div
01147506
Test Circuit and Layout Guidelines
As in any switching regulator, layout is very important. Rap-
idly 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.
01147507
Single-point grounding (as indicated) or ground plane con-
struction should be used for best results. When using the
Adjustable version, physically locate the programming resis-
tors near the regulator, to keep the sensitive feedback wiring
short.
11
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11 Page | ||
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| PDF Descargar | [ Datasheet 2575T-12.PDF ] | |
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