|
|
PDF LX8586A-00CP Data sheet ( Hoja de datos )
| Número de pieza | LX8586A-00CP | |
| Descripción | 6A LOW DROPOUT POSITIVE REGULATORS | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LX8586A-00CP (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
|
No Preview Available !
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 8586
LX8586-xx/8586A-xx
6A LOW DROPOUT POSITIVE REGULATORS
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The LX8586/86A series ICs are low
dropout three-terminal regulators with
a minimum of 6A output current.
Pentium® Processor, Power PCTM,
Cyrix® 6x86TM and AMD-K5TM applica-
tions requiring fast transient response
are ideally suited for this product
family. The LX8586A is guaranteed to
have
< 1.1V at 6A and the LX8586 < 1.3V at
6A dropout voltage, making them
ideal to provide well-regulated outputs
of 2.5V to 3.6V using a 5V input
supply. Fixed versions are also
available and specified in the Available
Options table below.
Current limit is trimmed above 6.1A
to ensure adequate output current and
controlled short-circuit current.
On-chip thermal limiting provides
protection against any combination of
overload that would create excessive
junction temperatures.
The LX8586/86A series devices are
available in both through-hole versions
of the industry-standard, 3-pin TO-220
and TO-247 power packages.
Along with the standard µP supply
applications, the LX8586 series of
products are ideal for Pentium® Pro
Processor applications such as GTL+
Bus terminators (see application below).
PRODUCT HIGHLIGHT
1.5V, 6A R E G U L AT O R
H.S. (Note A)
From Silverbox
Power Supply
3.3V
1500µF
Sanyo
6MV1500GX
LX8586
IN OUT
ADJ
24.3Ω
±1%
121Ω
±1%
1.5V/6A
To GTL+
Terminator
4x 1500µF
Sanyo
6MV1500GX
A P P L I C AT I O N O F L X 8 5 8 6 AS 1 . 5 V G T L + B U S T E R M I N AT O R
Note A: See application note, page 3.
KEY FEATURES
s THREE-TERMINAL ADJUSTABLE OR FIXED
OUTPUT
s GUARANTEED < 1.1V HEADROOM AT 6A
(LX8586A)
s GUARANTEED < 1.3V HEADROOM AT 6A
(LX8586)
s OUTPUT CURRENT OF 6A MINIMUM
p FAST TRANSIENT RESPONSE
p 1% VOLTAGE REFERENCE INITIAL
ACCURACY
p OUTPUT SHORT CIRCUIT PROTECTION
p BUILT-IN THERMAL SHUTDOWN
s EVALUATION BOARD AVAILABLE:
REQUEST LXE9001 EVALUATION KIT
A P P L I C AT I O N S
s GTL+ BUS TERMINATORS
s PENTIUM PROCESSOR SUPPLIES
s POWER PC SUPPLIES
s MICROPROCESSOR SUPPLIES
s LOW VOLTAGE LOGIC SUPPLIES
s POST REGULATOR FOR SWITCHING SUPPLY
s LXE9001 EVALUATION BOARD FOR
PENTIUM APPLICATIONS AVAILABLE.
CONSULT FACTORY
s CYRIX 6x86TM
s AMD-K5TM AND AMD-K6TM
AVAILABLE O PTIONS PER PAR T #
Part #
Output
Voltage
LX8586/86A-00
Adjustable
LX8586/86A-33
3.3V
Other voltage options may be available —
Please contact factory for details.
Copyright © 1996
Rev. 1.0 12/96
PACKAGE ORDER INFORMATION
TA (°C)
Dropout
Voltage
P
Plastic TO-220
3-pin
V
Plastic TO-247
3-terminal
0 to 125
1.3V
1.1V
LX8586-xxCP
LX8586A-xxCP
LX8586-xxCV
LX8586A-xxCV
"xx" refers to output voltage, please see table above.
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
1 page  
PRODUCT DATABOOK 1996/1997
LX8586-xx/8586A-xx
6A LOW DROPOUT POSITIVE REGULATORS
PR O D U C T I O N D ATA S H E E T
APPLICATION NOTES
OVERLOAD RECOVERY (continued)
If this limited current is not sufficient to develop the designed
voltage across the output resistor, the voltage will stabilize at some
lower value, and will never reach the designed value. Under these
circumstances, it may be necessary to cycle the input voltage down
to zero in order to make the regulator output voltage return to
regulation.
RIPPLE REJECTION
Ripple rejection can be improved by connecting a capacitor
between the ADJ pin and ground. The value of the capacitor should
be chosen so that the impedance of the capacitor is equal in
magnitude to the resistance of R1 at the ripple frequency. The
capacitor value can be determined by using this equation:
C = 1 / (6.28 * FR * R1)
where: C ≡ the value of the capacitor in Farads;
select an equal or larger standard value.
FR ≡ the ripple frequency in Hz
R1 ≡ the value of resistor R1 in ohms
At a ripple frequency of 120Hz, with R1 = 100Ω:
C = 1 / (6.28 * 120Hz * 100Ω) = 13.3µF
The closest equal or larger standard value should be used, in this
case, 15µF.
When an ADJ pin bypass capacitor is used, output ripple
amplitude will be essentially independent of the output voltage. If
an ADJ pin bypass capacitor is not used, output ripple will be
proportional to the ratio of the output voltage to the reference
voltage:
M = VOUT/VREF
where: M ≡ a multiplier for the ripple seen when the
ADJ pin is optimally bypassed.
VREF = 1.25V.
For example, if VOUT = 2.5V the output ripple will be:
M = 2.5V/1.25V= 2
Output ripple will be twice as bad as it would be if the ADJ pin
were to be bypassed to ground with a properly selected capacitor.
OUTPUT VOLTAGE
The LX8586/86A ICs develop a 1.25V reference voltage between the
output and the adjust terminal (See Figure 2). By placing a resistor, R1,
between these two terminals, a constant current is caused to flow
through R1 and down through R2 to set the overall output voltage.
Normally this current is the specified minimum load current of 10mA.
Because IADJis very small and constant when compared with the current
through R1, it represents a small error and can usually be ignored.
LX8586/86A
VIN IN OUT
ADJ
VREF
IADJ
50µA
VOUT = VREF
1
+
R2
R1
+ IADJ R2
VOUT
R1
R2
FIGURE 2 — BASIC ADJUSTABLE REGULATOR
LOAD REGULATION
Because the LX8586/86A regulators are three-terminal devices, it is
not possible to provide true remote load sensing. Load regulation
will be limited by the resistance of the wire connecting the regulator
to the load. The data sheet specification for load regulation is
measured at the bottom of the package. Negative side sensing is a
true Kelvin connection, with the bottom of the output divider
returned to the negative side of the load. Although it may not be
immediately obvious, best load regulation is obtained when the top
of the resistor divider, (R1), is connected directly to the case of the
regulator, not to the load. This is illustrated in Figure 3. If R1 were
connected to the load, the effective resistance between the regulator
and the load would be:
RPeff = RP *
R2+R1
R1
where: RP ≡ Actual parasitic line resistance.
When the circuit is connected as shown in Figure 3, the parasitic
resistance appears as its actual value, rather than the higher RPeff.
LX8586/86A
ParRaPsitic
Line Resistance
VIN IN
OUT
ADJ Connect
R1 to Case
of Regulator
R1
R2 RL
Connect
R2
to Load
FIGURE 3 — CONNECTIONS FOR BEST LOAD REGULATION
Copyright © 1996
Rev. 1.0 12/96
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LX8586A-00CP.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LX8586A-00CP | 6A LOW DROPOUT POSITIVE REGULATORS | Microsemi Corporation |
| LX8586A-00CV | 6A LOW DROPOUT POSITIVE REGULATORS | Microsemi Corporation |
| 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 |