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부품번호 LB03 기능
기능 SIMPLE SWITCHER 3A Step-Down Voltage Regulator
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LB03 데이터시트, 핀배열, 회로
June 1999
LM2576/LM2576HV Series
SIMPLE SWITCHER® 3A Step-Down Voltage Regulator
General Description
The LM2576 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 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 LM2576 series offers a high-efficiency replacement for
popular three-terminal linear regulators. It substantially re-
duces the size of the heat sink, and in some cases no heat
sink is required.
A standard series of inductors optimized for use with the
LM2576 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 3A 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)
FIGURE 1.
DS011476-1
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011476
www.national.com




LB03 pdf, 반도체, 판매, 대치품
LM2576-12, LM2576HV-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
LM2576-12
LM2576HV-12
Units
(Limits)
Typ Limit
(Note 2)
SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2
VOUT
Output Voltage
VIN = 25V, ILOAD = 0.5A
Circuit of Figure 2
12 V
11.76
V(Min)
12.24
V(Max)
VOUT
Output Voltage
LM2576
0.5A ILOAD 3A,
15V VIN 40V
Circuit of Figure 2
12 V
11.52/11.40
V(Min)
12.48/12.60
V(Max)
VOUT
Output Voltage
LM2576HV
0.5A ILOAD 3A,
15V VIN 60V
Circuit of Figure 2
12 V
11.52/11.40
V(Min)
12.54/12.66
V(Max)
η Efficiency
VIN = 15V, ILOAD = 3A
88
%
LM2576-15, LM2576HV-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
LM2576-15
LM2576HV-15
Units
(Limits)
Typ Limit
(Note 2)
SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2
VOUT
Output Voltage
VIN = 25V, ILOAD = 0.5A
Circuit of Figure 2
15 V
14.70
V(Min)
15.30
V(Max)
VOUT
Output Voltage
LM2576
0.5A ILOAD 3A,
18V VIN 40V
Circuit of Figure 2
15 V
14.40/14.25
V(Min)
15.60/15.75
V(Max)
VOUT
η
Output Voltage
LM2576HV
Efficiency
0.5A ILOAD 3A,
18V VIN 60V
Circuit of Figure 2
VIN = 18V, ILOAD = 3A
15 V
14.40/14.25
V(Min)
15.68/15.83
V(Max)
88 %
LM2576-ADJ, LM2576HV-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
LM2576-ADJ
LM2576HV-ADJ
Units
(Limits)
Typ Limit
(Note 2)
SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2
VOUT
Feedback Voltage
VIN = 12V, ILOAD = 0.5A
VOUT = 5V,
Circuit of Figure 2
1.230
1.217
1.243
V
V(Min)
V(Max)
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4

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LB03 전자부품, 판매, 대치품
Typical Performance Characteristics (Circuit of Figure 2) (Continued)
Current Limit
Quiescent Current
Standby
Quiescent Current
DS011476-30
Oscillator Frequency
Switch Saturation
Voltage
DS011476-31
Efficiency
DS011476-32
DS011476-33
Minimum Operating Voltage
Quiescent Current
vs Duty Cycle
DS011476-34
Feedback Voltage
vs Duty Cycle
DS011476-35
DS011476-36
DS011476-37
DS011476-38
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LB03

SIMPLE SWITCHER 3A Step-Down Voltage Regulator

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