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PDF LM2586 Data sheet ( Hoja de datos )

Número de pieza LM2586
Descripción SIMPLE SWITCHER 3A Flyback Regulator with Shutdown
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM2586 Hoja de datos, Descripción, Manual

May 1996
LM2586
SIMPLE SWITCHER® 3A Flyback Regulator with
Shutdown
General Description
The LM2586 series of regulators are monolithic integrated
circuits specifically designed for flyback, step-up (boost), and
forward converter applications. The device is available in 4
different output voltage versions: 3.3V, 5.0V, 12V, and adjust-
able.
Requiring a minimum number of external components, these
regulators are cost effective, and simple to use. Included in
the datasheet are typical circuits of boost and flyback regula-
tors. Also listed are selector guides for diodes and capacitors
and a family of standard inductors and flyback transformers
designed to work with these switching regulators.
The power switch is a 3.0A NPN device that can stand-off
65V. Protecting the power switch are current and thermal
limiting circuits, and an undervoltage lockout circuit. This IC
contains an adjustable frequency oscillator that can be pro-
grammed up to 200 kHz. The oscillator can also be synchro-
nized with other devices, so that multiple devices can oper-
ate at the same switching frequency.
Other features include soft start mode to reduce in-rush cur-
rent during start up, and current mode control for improved
rejection of input voltage and output load transients and
cycle-by-cycle current limiting. The device also has a shut-
down pin, so that it can be turned off externally. An output
voltage tolerance of ±4%, within specified input voltages and
output load conditions, is guaranteed for the power supply
system.
Features
n Requires few external components
n Family of standard inductors and transformers
n NPN output switches 3.0A, can stand off 65V
n Wide input voltage range: 4V to 40V
n Adjustable switching frequency: 100 kHz to 200 kHz
n External shutdown capability
n Draws less than 60 µA when shut down
n Frequency synchronization
n Current-mode operation for improved transient
response, line regulation, and current limit
n Internal soft-start function reduces in-rush current during
start-up
n Output transistor protected by current limit, under
voltage lockout, and thermal shutdown
n System output voltage tolerance of ±4% max over line
and load conditions
Typical Applications
n Flyback regulator
n Forward converter
n Multiple-output regulator
n Simple boost regulator
Flyback Regulator
SIMPLE SWITCHER® and Switchers Made Simple ® are registered trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012516
DS012516-1
www.national.com

1 page




LM2586 pdf
LM2586-ADJ (Continued)
Symbol
Parameters
Conditions
COMMON DEVICE PARAMETERS for all versions (Note 5)
IS Input Supply Current
IS/D Shutdown Input
Supply Current
Switch Off (Note 8)
ISWITCH = 1.8A
VSH = 3V
VUV Input Supply
Undervoltage Lockout
RLOAD = 100
fO Oscillator Frequency Measured at Switch Pin
RLOAD = 100, VCOMP = 1.0V
Freq. Adj. Pin Open (Pin 1)
fSC
VEAO
Short-Circuit
Frequency
Error Amplifier
Output Swing
RSET = 22 k
Measured at Switch Pin
RLOAD = 100
VFEEDBACK = 1.15V
Upper Limit
(Note 7)
Lower Limit
(Note 8)
IEAO
Error Amp
Output Current
(Note 9)
(Source or Sink)
ISS
DMAX
Soft Start Current
Maximum Duty Cycle
VFEEDBACK = 0.92V
VCOMP = 1.0V
RLOAD = 100
(Note 7)
IL
VSUS
VSAT
ICL
VSTH
ISYNC
VSHTH
Switch Leakage
Current
Switch Sustaining Voltage
Switch Saturation Voltage
NPN Switch Current Limit
Synchronization
Threshold Voltage
Synchronization
Pin Current
ON/OFF Pin (Pin 1)
Threshold Voltage
Switch Off
VSWITCH = 60V
dV/dT = 1.5V/ns
ISWITCH = 3.0A
FSYNC = 200 kHz
VCOMP = 1V, VIN = 5V
VIN = 5V
VCOMP = 1V, VSYNC = VSTH
VCOMP = 1V
(Note 10)
ISH ON/OFF Pin (Pin 1)
Current
θJA Thermal Resistance
VCOMP = 1V
VSH = VSHTH
T Package, Junction to
Ambient (Note 11)
θJA T Package, Junction to
Ambient (Note 12)
θJC T Package, Junction to Case
θJA S Package, Junction to
Ambient (Note 13)
θJA S Package, Junction to
Ambient (Note 14)
θJA S Package, Junction to
Ambient (Note 15)
θJC S Package, Junction to Case
Typical
11
50
16
3.30
100
200
25
2.8
0.25
165
11.0
98
15
0.45
4.0
0.75
100
1.6
40
65
45
2
56
35
26
2
5
Min
3.05
85/75
2.6/2.4
110/70
8.0/7.0
93/90
65
3.0
0.625/0.40
1.0/0.8
15/10
Max
15.5/16.5
100/115
100/300
3.75
Units
mA
mA
µA
V
115/125
0.40/0.55
kHz
kHz
kHz
V
V
260/320
17.0/19.0
300/600
0.65/0.9
7.0
0.875/1.00
200
2.2/2.4
65/75
µA
µA
%
µA
V
V
A
V
µA
V
µA
˚C/W
www.national.com

5 Page





LM2586 arduino
Flyback Regulator Operation (Continued)
DS012516-24
As shown in Figure 4, the LM2586 can be used as a flyback regulator by using a minimum number of external components. The switching waveforms of this
regulator are shown in Figure 5. Typical Performance Characteristics observed during the operation of this circuit are shown in Figure 6.
FIGURE 4. 12V Flyback Regulator Design Example
Typical Performance Characteristics
A: Switch Voltage, 20V/div
B: Switch Current, 2A/div
C: Output Rectifier Current, 2A/div
D: Output Ripple Voltage, 50 mV/div AC-Coupled
DS012516-65
FIGURE 5. Switching Waveforms
11 www.national.com

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