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PDF CS5205A-1GDP3 Data sheet ( Hoja de datos )
| Número de pieza | CS5205A-1GDP3 | |
| Descripción | 5A Adjustable Linear Regulator | |
| Fabricantes | Cherry Semiconductor Corporation | |
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CS5205A-1
5A Adjustable Linear Regulator
Description
The CS5205A-1 linear regulator
provides 5A at an adjustable volt-
age with an accuracy of ±1%. Two
external resistors are used to set the
output voltage within a 1.25V to
13V range.
The regulator is intended for use as
a post regulator and microproces-
sor supply. The fast loop response
and low dropout voltage make this
regulator ideal for applications
where low voltage operation and
good transient response are impor-
tant.
The circuit is designed to operate
with dropout voltages as low as 1V
depending on the output current
level. The maximum quiescent cur-
rent is only 10mA at full load.
The regulator is fully protected
against overload conditions with
protection circuitry for Safe
Operating Area (SOA), overcurrent
and thermal shutdown.
The CS5205A-1 is pin compatible
with the LT1084 family of linear
regulators but has lower dropout
voltage.
The regulator is available in TO-220
and surface mount D2 packages.
Features
s Output Current to 5A
s Output Trimmed to +/- 1%
s Dropout Voltage
1.15V @ 5A
s Fast Transient Response
s Fault Protection Circuitry
Thermal Shutdown
Overcurrent Protection
Safe Area Protection
Block Diagram
Package Options
3L TO-220
Tab (VOUT)
3L D2PAK
VOUT
VIN 1
Thermal
Shutdown
Bandgap
Output
Current
Limit
- + Error
Amplifier
Adj
1 Adj
2 VOUT
3 VIN
1
Rev. 7/8/97
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: [email protected]
Web Site: www.cherry-semi.com
1 A ¨ Company
1 page  
Applications Information: continued
Best load regulation occurs when R1 is connected directly
to the output pin of the regulator as shown in Figure 3. If
R1 is connected to the load, RC is multiplied by the divider
ratio and the effective resistance between the regulator and
the load becomes
( )RC ´ R1 + R2
R1
RC = conductor parasitic resistance
VIN VOUT
CS5205A-1
Adj
conductor parasitic
RC resistance
RLOAD
R1
R2
The maximum power dissipation for a regulator is:
PD(max)={VIN(max)ÐVOUT(min)}IOUT(max)+VIN(max)IQ
(2)
where
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current, for the application
IQ is the maximum quiescent current at IOUT(max).
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment has a thermal resistance. Like series
electrical resistances, these resistances are summed to
determine RQJA, the total thermal resistance between the
junction and the surrounding air.
1. Thermal Resistance of the junction to case, RQJC (¡C/W)
2. Thermal Resistance of the case to Heat Sink, RQCS (¡C/W)
3. Thermal Resistance of the Heat Sink to the ambient air,
RQSA (¡C/W)
Figure 3. Grounding scheme for the adjustable output regulator to min-
imize parasitics.
Calculating Power Dissipation and Heat Sink Requirements
The CS5205A-1 linear regulator includes thermal shut-
down and safe operating area circuitry to protect the
device. High power regulators such as these usually oper-
ate at high junction temperatures so it is important to cal-
culate the power dissipation and junction temperatures
accurately to ensure that an adequate heat sink is used.
The case is connected to VOUT on the CS5205A-1, electrical
isolation may be required for some applications. Thermal
compound should always be used with high current regu-
lators such as these.
The thermal characteristics of an IC depend on the follow-
ing four factors:
1. Maximum Ambient Temperature TA (¡C)
2. Power dissipation PD (Watts)
3. Maximum junction temperature TJ (¡C)
4. Thermal resistance junction to ambient RQJA (C/W)
These are connected by the equation:
RQJA = RQJC + RQCS + RQSA
(3)
The value for RQJA is calculated using equation (3) and the
result can be substituted in equation (1).
The value for RQJC is normally quoted as a single figure for
a given package type based on an average die size. For a
high current regulator such as the CS5205A-1 the majority
of the heat is generated in the power transistor section.
The value for RQSA depends on the heat sink type, while
RQCS depends on factors such as package type, heat sink
interface (is an insulator and thermal grease used?), and
the contact area between the heat sink and the package.
Once these calculations are complete, the maximum per-
missible value of RQJA can be calculated and the proper
heat sink selected. For further discussion on heat sink
selection, see application note ÒThermal Management for
Linear Regulators.Ó
These four are related by the equation
TJ = TA + PD ´ RQJA
(1)
The maximum ambient temperature and the power dissi-
pation are determined by the design while the maximum
junction temperature and the thermal resistance depend
on the manufacturer and the package type.
5
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet CS5205A-1GDP3.PDF ] | |
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