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PDF LM2577 Data sheet ( Hoja de datos )

Número de pieza LM2577
Descripción SIMPLE SWITCHER Step-Up Voltage Regulator
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM2577 Hoja de datos, Descripción, Manual

June 1999
LM1577/LM2577 Series
SIMPLE SWITCHER® Step-Up Voltage Regulator
General Description
The LM1577/LM2577 are monolithic integrated circuits that
provide all of the power and control functions for step-up
(boost), flyback, and forward converter switching regulators.
The device is available in three different output voltage ver-
sions: 12V, 15V, and adjustable.
Requiring a minimum number of external components, these
regulators are cost effective, and simple to use. Listed in this
data sheet are a family of standard inductors and flyback
transformers designed to work with these switching regula-
tors.
Included on the chip is a 3.0A NPN switch and its associated
protection circuitry, consisting of current and thermal limiting,
and undervoltage lockout. Other features include a 52 kHz
fixed-frequency oscillator that requires no external compo-
nents, a soft start mode to reduce in-rush current during
start-up, and current mode control for improved rejection of
input voltage and output load transients.
Features
n Requires few external components
n NPN output switches 3.0A, can stand off 65V
n Wide input voltage range: 3.5V to 40V
n Current-mode operation for improved transient
response, line regulation, and current limit
n 52 kHz internal oscillator
n Soft-start function reduces in-rush current during start-up
n Output switch protected by current limit, under-voltage
lockout, and thermal shutdown
Typical Applications
n Simple boost regulator
n Flyback and forward regulators
n Multiple-output regulator
Typical Application
Note: Pin numbers shown are for TO-220 (T) package.
Ordering Information
DS011468-1
Temperature
Range
−40˚C TA +125˚C
−55˚C TA +150˚C
Package
Type
24-Pin Surface Mount
16-Pin Molded DIP
5-Lead Surface Mount
5-Straight Leads
5-Bent Staggered
Leads
4-Pin TO-3
Output Voltage
12V 15V
LM2577M-12 LM2577M-15
LM2577N-12 LM2577N-15
LM2577S-12 LM2577S-15
LM2577T-12 LM2577T-15
LM2577T-12 LM2577T-15
Flow LB03
Flow LB03
LM1577K-12/883 LM1577K-15/883
ADJ
LM2577M-ADJ
LM2577N-ADJ
LM2577S-ADJ
LM2577T-ADJ
LM2577T-ADJ
Flow LB03
LM1577K-
ADJ/883
NSC
Package Package
Drawing
M24B
SO
N16A
N
TS5B TO-263
T05A TO-220
T05D TO-220
K04A TO-3
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011468
www.national.com

1 page




LM2577 pdf
Electrical Characteristics — LM1577-ADJ, LM2577-ADJ
Specifications with standard type face are
Range. Unless otherwise specified, VIN =
5foVr,TVJF=EE2D5B˚ACC,Ka=ndVtRhEoFs,eainndbIoSWldITtCyHpe=
face
0.
apply
over
full
Operating
Temperature
LM1577-ADJ LM2577-ADJ
Units
Symbol
Parameter
Conditions
Typical
Limit
Limit
(Limits)
(Notes 3, 4) (Note 5)
SYSTEM PARAMETERS Circuit of Figure 3 (Note 6)
VOUT
Output Voltage
VIN = 5V to 10V
ILOAD = 100 mA to 800 mA
(Note 3)
12.0 V
11.60/11.40 11.60/11.40 V(min)
12.40/12.60 12.40/12.60 V(max)
VOUT/
VIN
VOUT/
ILOAD
η
Line Regulation
Load Regulation
Efficiency
DEVICE PARAMETERS
VIN = 3.5V to 10V
ILOAD = 300 mA
VIN = 5V
ILOAD = 100 mA to 800 mA
VIN = 5V, ILOAD = 800 mA
20 mV
50/100
50/100
mV(max)
20 mV
50/100
50/100
mV(max)
80 %
IS
Input Supply Current VFEEDBACK = 1.5V (Switch Off)
7.5
mA
10.0/14.0
10.0/14.0
mA(max)
ISWITCH = 2.0A
25
mA
VCOMP = 2.0V (Max Duty Cycle)
50/85
50/85
mA(max)
VUV Input Supply
ISWITCH = 100 mA
2.90
V
Undervoltage Lockout
2.70/2.65
2.70/2.65
V(min)
3.10/3.15
3.10/3.15
V(max)
fO Oscillator Frequency Measured at Switch Pin
ISWITCH = 100 mA
52 kHz
48/42
48/42
kHz(min)
56/62
56/62
kHz(max)
VREF
VREF/
VIN
IB
Reference
Voltage
Reference Voltage
Line Regulation
Error Amp
Input Bias Current
Measured at Feedback Pin
VIN = 3.5V to 40V
VCOMP = 1.0V
VIN = 3.5V to 40V
VCOMP = 1.0V
1.230
0.5
1.214/1.206 1.214/1.206
1.246/1.254 1.246/1.254
V
V(min)
V(max)
mV
100 nA
300/800
300/800
nA(max)
GM Error Amp
ICOMP = −30 µA to +30 µA
Transconductance
VCOMP = 1.0V
3700
2400/1600
4800/5800
2400/1600
4800/5800
µmho
µmho(min)
µmho(max)
AVOL
Error Amp
Voltage Gain
Error Amplifier
VCOMP = 1.1V to 1.9V
RCOMP = 1.0 M(Note 7)
Upper Limit
800 V/V
500/250
500/250
V/V(min)
2.4 V
Output Swing
VFEEDBACK = 1.0V
Lower Limit
2.2/2.0
2.2/2.0
V(min)
0.3 V
Error Amp
Output Current
VFEEDBACK = 1.5V
VFEEDBACK = 1.0V to 1.5V
VCOMP = 1.0V
±200
0.40/0.55
0.40/0.55
±130/±90
±300/±400
±130/±90
±300/±400
V(max)
µA
µA(min)
µA(max)
ISS
Soft Start Current
VFEEDBACK = 1.0V
VCOMP = 0V
5.0 µA
2.5/1.5
2.5/1.5
µA(min)
7.5/9.5
7.5/9.5
µA(max)
D
ISWITCH/
VCOMP
Maximum Duty Cycle
Switch
Transconductance
VCOMP = 1.5V
ISWITCH = 100 mA
95
12.5
93/90
93/90
%
%(min)
A/V
5 www.national.com

5 Page





LM2577 arduino
LM1577-12, LM2577-12 Test Circuit
DS011468-30
L = 415-0930 (AIE)
D = any manufacturer
COUT = Sprague Type 673D
Electrolytic 680 µF, 20V
Note: Pin numbers shown are for TO-220 (T) package
FIGURE 1. Circuit Used to Specify System Parameters for 12V Versions
LM1577-15, LM2577-15 Test Circuit
DS011468-26
L = 415-0930 (AIE)
D = any manufacturer
COUT = Sprague Type 673D
Electrolytic 680 µF, 20V
Note: Pin numbers shown are for TO-220 (T) package
FIGURE 2. Circuit Used to Specify System Parameters for 15V Versions
LM1577-ADJ, LM2577-ADJ Test Circuit
DS011468-9
L = 415-0930 (AIE)
D = any manufacturer
COUT = Sprague Type 673D
Electrolytic 680 µF, 20V
R1 = 48.7k in series with 511(1%)
R2 = 5.62k (1%)
Note: Pin numbers shown are for TO-220 (T) package
FIGURE 3. Circuit Used to Specify System Parameters for ADJ Versions
11
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