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PDF LM2575 Data sheet ( Hoja de datos )
| Número de pieza | LM2575 | |
| Descripción | 1A Step-Down Voltage Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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 1. - 1A, Step-Down Switching Regulator  Hay una vista previa y un enlace de descarga de LM2575 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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 pow-
er supplies.
Other features include a guaranteed ±4% tolerance on output
voltage within specified input voltages and output load con-
ditions, and ±10% on the oscillator frequency. External shut-
down is included, featuring 50 μA (typical) standby current.
The output switch includes cycle-by-cycle current limiting, as
well as thermal shutdown for full protection under fault con-
ditions.
Features
■ 3.3V, 5V, 12V, 15V, and adjustable output versions
■ Adjustable version output voltage range,
1.23V to 37V (57V for HV version) ±4% max over
line and load conditions
■ Guaranteed 1A output current
■ Wide input voltage range, 40V up to 60V for HV version
■ Requires only 4 external components
■ 52 kHz fixed frequency internal oscillator
■ TTL shutdown capability, low power standby mode
■ High efficiency
■ Uses readily available standard inductors
■ Thermal shutdown and current limit protection
■ P+ Product Enhancement tested
Applications
■ Simple high-efficiency step-down (buck) regulator
■ Efficient pre-regulator for linear regulators
■ On-card switching regulators
■ Positive to negative converter (Buck-Boost)
Typical Application
(Fixed Output Voltage Versions)
Note: Pin numbers are for the TO-220 package.
1147501
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation
© 2007 National Semiconductor Corporation 11475
1 page  
LM1575-ADJ, LM2575-ADJ, LM2575HV-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 LM1575-ADJ LM2575-ADJ Units
LM2575HV-ADJ (Limits)
Limit
(Note 2)
Limit
(Note 3)
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
VOUT
Feedback Voltage
VIN = 12V, ILOAD = 0.2A
VOUT = 5V
Circuit of Figure 2
1.230
1.217
1.243
1.217
1.243
V
V(Min)
V(Max)
VOUT
Feedback Voltage
LM1575/LM2575
VOUT
Feedback Voltage
LM2575HV
η Efficiency
0.2A ≤ ILOAD ≤ 1A,
8V ≤ VIN ≤ 40V
VOUT = 5V, Circuit of Figure 2
0.2A ≤ ILOAD ≤ 1A,
8V ≤ VIN ≤ 60V
VOUT = 5V, Circuit of Figure 2
VIN = 12V, ILOAD = 1A, VOUT = 5V
1.230
1.230
77
1.205/1.193
1.255/1.267
1.205/1.193
1.261/1.273
1.193/1.180
1.267/1.280
1.193/1.180
1.273/1.286
V
V(Min)
V(Max)
V
V(Min)
V(Max)
%
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, 5V, and Adjustable version, VIN = 25V for the 12V version, and VIN =
30V for the 15V version. ILOAD = 200 mA.
Symbol
Parameter
Conditions
Typ LM1575-XX LM2575-XX Units
LM2575HV-XX (Limits)
Limit
Limit
(Note 2)
(Note 3)
DEVICE PARAMETERS
Ib Feedback Bias Current VOUT = 5V (Adjustable Version Only)
fO Oscillator Frequency (Note 13)
50 100/500
52
47/43
100/500
47/42
nA
kHz
kHz(Min)
58/62
58/63
kHz(Max)
VSAT
Saturation Voltage
IOUT = 1A (Note 5)
0.9
1.2/1.4
1.2/1.4
V
V(Max)
DC Max Duty Cycle (ON) (Note 6)
98
%
93 93 %(Min)
ICL Current Limit
Peak Current (Notes 5, 13)
2.2
1.7/1.3
1.7/1.3
A
A(Min)
3.0/3.2
3.0/3.2
A(Max)
IL
Output Leakage
(Notes 7, 8)
Output = 0V
Current
Output = −1V
2
7.5
2 mA(Max)
mA
Output = −1V
30 30 mA(Max)
IQ
Quiescent Current
(Note 7)
5
10/12
mA
10 mA(Max)
ISTBY
Standby Quiescent
Current
ON /OFF Pin = 5V (OFF)
50
200/500
μA
200 μA(Max)
7
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LM2575.PDF ] | |
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