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PDF CS5207-1GT3 Data sheet ( Hoja de datos )
| Número de pieza | CS5207-1GT3 | |
| Descripción | 7A Adjustable Linear Regulator | |
| Fabricantes | Cherry Semiconductor Corporation | |
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CS5207-1
7A Adjustable Linear Regulator
Description
The CS5207-1 linear regulator pro-
vides 7A at adjustable voltages
with an accuracy of ±1.5%. Two
external resistors are used to set the
output voltage within a 1.25V to
13V range.
The regulator is intended for use as
post regulator and microprocessor
supply. The fast loop response and
low dropout voltage make this reg-
ulator ideal for applications where
low voltage operation and good
transient response are important.
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 regulator is available in a
TO-220 package. A 3.3V, fixed ver-
sion is also available. Please consult
factory for more information.
Features
s Output Current to 7A
s Output Trimmed to ±1.5%
s Dropout Voltage
1.4V @ 7A
s Fast Transient Response
s Fault Protection Circuitry
Thermal Shutdown
Overcurrent Protection
Safe Area Protection
s 3.3V Fixed Version
Available
VIN
Rev. 7/8/97
Block Diagram
Package Options
VOUT
3L TO-220
Tab (VOUT)
Thermal
Shutdown
Bandgap
Output
Current
Limit
- + Error
Amplifier
Adj
1 Adj
2 VOUT
3 VIN
1
A 3.3V fixed version is also available.
*Consult factory.
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 VIN
VOUT
conductor parasitic
RC resistance
CS5207-1
Adj
R1
RLOAD
R2
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.
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.
Figure 3. Grounding scheme for the adjustable output regulator to min-
imize parasitics.
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)
Calculating Power Dissipation and Heat Sink Requirements
The CS5207-1 linear regulator includes thermal shutdown
and safe operating area circuitry to protect the device.
High power regulators such as this usually operate at high
junction temperatures so it is important to calculate the
power dissipation and junction temperatures accurately to
ensure that an adequate heat sink is used.
The case is connected to VOUT on the CS5207-1, 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 CS5207-1 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 inter-
face (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 permissible
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)
5
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| PDF Descargar | [ Datasheet CS5207-1GT3.PDF ] | |
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