|
|
PDF LM2587 Data sheet ( Hoja de datos )
| Número de pieza | LM2587 | |
| Descripción | SIMPLE SWITCHER 5A Flyback Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LM2587 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
|
No Preview Available !
April 1998
LM2587
SIMPLE SWITCHER® 5A Flyback Regulator
General Description
The LM2587 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 5.0A 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 a 100 kHz fixed-frequency internal oscillator that
permits the use of small magnetics. Other features include
soft start mode to reduce in-rush current during start up, cur-
rent mode control for improved rejection of input voltage and
output load transients and cycle-by-cycle current limiting. An
output voltage tolerance of ±4%, within specified input volt-
ages 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 5.0A, can stand off 65V
n Wide input voltage range: 4V to 40V
n Current-mode operation for improved transient
response, line regulation, and current limit
n 100 kHz switching frequency
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 Multiple-output regulator
n Simple boost regulator
n Forward converter
Flyback Regulator
Ordering Information
DS012316-1
Package Type
5-Lead TO-220 Bent, Staggered Leads
5-Lead TO-263
5-Lead TO-263 Tape and Reel
NSC Package
Drawing
T05D
TS5B
TS5B
Order Number
LM2587T-3.3, LM2587T-5.0, LM2587T-12, LM2587T-ADJ
LM2587S-3.3, LM2587S-5.0, LM2587S-12, LM2587S-ADJ
LM2587SX-3.3, LM2587SX-5.0, LM2587SX-12,
LM2587SX-ADJ
SIMPLE SWITCHER® and Switchers Made Simple® are registered trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012316
www.national.com
1 page  
All Output Voltage Versions
Electrical Characteristics (Note 5) (Continued)
Symbol
Parameters
Conditions
Typical
Min
Max Units
COMMON DEVICE PARAMETERS (Note 4)
θJA
Thermal Resistance
T Package, Junction to Ambient
(Note 10)
65
θJA
T Package, Junction to Ambient
45
(Note 11)
θJC
T Package, Junction to Case
2
θJA
S Package, Junction to Ambient
56
˚C/W
(Note 12)
θJA
S Package, Junction to Ambient
35
(Note 13)
θJA
S Package, Junction to Ambient
26
(Note 14)
θJC
S Package, Junction to Case
2
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended to
be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the Electrical
Characteristics.
Note 2: Note that switch current and output current are not identical in a step-up regulator. Output current cannot be internally limited when the LM2587 is used as
a step-up regulator. To prevent damage to the switch, the output current must be externally limited to 5A. However, output current is internally limited when the
LM2587 is used as a flyback regulator (see the Application Hints section for more information).
Note 3: The junction temperature of the device (TJ) is a function of the ambient temperature (TA), the junction-to-ambient thermal resistance (θJA), and the power
dissipation of the device (PD). A thermal shutdown will occur if the temperature exceeds the maximum junction temperature of the device: PD x θJA + TA(MAX) ≥ TJ-
(MAX). For a safe thermal design, check that the maximum power dissipated by the device is less than: PD ≤ [TJ(MAX) − TA(MAX))]/θJA. When calculating the maximum
allowable power dissipation, derate the maximum junction temperature — this ensures a margin of safety in the thermal design.
Note 4: External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM2587 is used as
shown in Figure 2 and Figure 3, system performance will be as specified by the system parameters.
Note 5: All room temperature limits are 100% production tested, and all limits at temperature extremes are guaranteed via correlation using standard Statistical Qual-
ity Control (SQC) methods.
Note 6: A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.
Note 7: To measure this parameter, the feedback voltage is set to a low value, depending on the output version of the device, to force the error amplifier output high.
Adj: VFB = 1.05V; 3.3V: VFB = 2.81V; 5.0V: VFB = 4.25V; 12V: VFB = 10.20V.
Note 8: To measure this parameter, the feedback voltage is set to a high value, depending on the output version of the device, to force the error amplifier output low.
Adj: VFB = 1.41V; 3.3V: VFB = 3.80V; 5.0V: VFB = 5.75V; 12V: VFB = 13.80V.
Note 9: To measure the worst-case error amplifier output current, the LM2587 is tested with the feedback voltage set to its low value (specified in Note 7) and at its
high value (specified in Note 8).
Note 10: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with 1⁄2 inch leads in a socket, or on a PC
board with minimum copper area.
Note 11: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with 1⁄2 inch leads soldered to a PC board
containing approximately 4 square inches of (1oz.) copper area surrounding the leads.
Note 12: Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.136 square inches (the same size as the
TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 13: Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.4896 square inches (3.6 times the area
of the TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 14: Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board copper area of 1.0064 square inches (7.4 times the
area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper. Additional copper area will reduce thermal resistance further. See the thermal model in Switchers Made
Simple® software.
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
DS012316-12
FIGURE 6. VOUT Load Current Step Response
Typical Flyback Regulator Applications
Figures 7, 8, 9, 11, 12 show six typical flyback applications,
varying from single output to triple output. Each drawing con-
tains the part number(s) and manufacturer(s) for every com-
ponent except the transformer. For the transformer part
numbers and manufacturers names, see the table in Figure
13. For applications with different output
voltages — requiring the LM2587-ADJ — or different output
configurations that do not match the standard configurations,
refer to the Switchers Made Simple software.
FIGURE 7. Single-Output Flyback Regulator
DS012316-13
11 www.national.com
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LM2587.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM258 | Low power dual operational amplifi |  NXP Semiconductors |
| LM258 | LOW POWER DUAL OPERATIONAL AMPLIFIERS |  STMicroelectronics |
| LM258 | Amplifiers and Comparators |  Motorola Inc |
| LM258 | LMx58 LMx58x LM2904 LM2904V Dual Operational Amplifiers (Rev. T) |  Texas Instruments |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |