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CS5203-1 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS5203-1은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 CS5203-1 자료 제공

부품번호 CS5203-1 기능
기능 3A Adjustable Linear Regulator
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS5203-1 데이터시트, 핀배열, 회로
CS5203-1
3A Adjustable Linear Regulator
Description
The CS5203-1 linear regulator pro-
vides 3A at adjustable output volt-
ages with an accuracy of ±1.5%.
The device uses two external resis-
tors to set the output voltage with-
in a 1.25V to 5.5V 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 voltage less than 1.4V
at 3A output current. Device pro-
tection includes overcurrent and
thermal shutdown.
The CS5203-1 is pin compatible
with the LT1085 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 3A
s Output Accuracy to ± 1.5%
Over Temperature
s Dropout Voltage (typical)
1.2V @ 3A
s Fast Transient Response
s Fault Protection
Current Limit
Thermal Shutdown
Application Diagram
5.0V VIN VOUT
CS5203-1
10mF
5V
Adj
0.1mF
5V
124W
1%
200W
1%
3.3V @ 3A
22mF
5V
Package Options
3L TO-220
Tab (VOUT)
3L D2PAK
Tab (VOUT)
1
1
CS5203 -1
1 Adj
2 VOUT (Tab)
3 VIN
Consult factory for fixed output
voltage versions.
Rev. 9/17/97
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Web Site: www.cherry-semi.com
1 A ¨ Company




CS5203-1 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics: continued
75
65
55
45
0 30 60
TA(°C)
Adjust Pin Current vs. Temperature
90
120
68.00
66.00
64.00
TCASE = 125°C
62.00
60.00
58.00
TCASE = 25°C
56.00
54.00
1.00
2.00
TCASE = 0°C
3.00 4.00 5.00
6.00 7.00 8.00
VIN - VOUT (V)
Adjust Pin Current vs. VIN -VOUT
70.00
68.50
67.00
65.50
64.00
62.50
61.00
59.50
58.00
56.50
55.00
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
IOUT (A)
Adjust Pin Current vs Output Current
+200
DVOUT 0
(mV)
-200
-200
3
I(A)
1
0
0
Transient Response
VIN = 5V
VOUT = 3.3V
CIN = 100mF
COUT = 10mF Tantalum
5
Time (ms)
10
6.00
5.00
4.00
3.00
2.00
1.00
0.00
1.00
2.00
3.00
4.00
5.00 6.00 7.00
VIN-VOUT (V)
Short Circuit Current vs VIN-VOUT
4

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CS5203-1 전자부품, 판매, 대치품
Applications Information: continued
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.
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)
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 3.5û C/W as a single figure for a given
package type based on an average die size. For a high
current regulator such as the CS5203-1 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
7

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