CS52015-1GT3

Manufacturer Part NumberCS52015-1GT3
DescriptionIC REG LIN 1.5A ADJ-OUT TO220AB
ManufacturerON Semiconductor
CS52015-1GT3 datasheets

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Specifications of CS52015-1GT3

Regulator TopologyPositive AdjustableVoltage - Output1.25 ~ 5.5 V
Voltage - InputUp to 7VVoltage - Dropout (typical)1.05V @ 1.5A
Number Of Regulators1Current - Output1.5A
Current - Limit (min)1.6AOperating Temperature0°C ~ 70°C
Mounting TypeThrough HolePackage / CaseTO-220-3 (Straight Leads)
Lead Free Status / RoHS StatusContains lead / RoHS non-compliantOther namesCS52015-1GT3OS
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Protection Diodes
When large external capacitors are used with a linear
regulator it is sometimes necessary to add protection diodes.
If the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator. The
discharge current depends on the value of the capacitor, the
output voltage and the rate at which V
CS52015−1 linear regulator, the discharge path is through a
large junction and protection diodes are not usually needed.
If the regulator is used with large values of output
capacitance and the input voltage is instantaneously shorted
to ground, damage can occur. In this case, a diode connected
as shown in Figure 13 is recommended.
IN4002 (Optional)
V
IN
V
V
IN
OUT
CS52015−1
C
1
Adj
C
Adj
Figure 13. Protection Diode for Large Output
Capacitors
Output Voltage Sensing
Since the CS52015−1 is a three terminal regulator, it is not
possible to provide true remote load sensing. Load
regulation is limited by the resistance of the conductors
connecting the regulator to the load.
For the adjustable regulator, the best load regulation
occurs when R1 is connected directly to the output pin of the
regulator as shown in Figure 14. 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.
R1 ) R2
R C
R1
where R
= conductor parasitic resistance.
C
R
V
V
V
IN
IN
OUT
CS52015−1
R
1
Adj
R
2
Figure 14. Grounding Scheme for Adjustable Output
Regulator to Minimize Parasitic Resistance Effects
Calculating Power Dissipation and Heat Sink
Requirements
The CS52015−1 linear regulator includes thermal
shutdown and current limit circuitry to protect the device.
High power regulators such as these usually operate at high
junction temperatures so it is important to calculate the
power dissipation and junction temperatures accurately to
drops. In the
IN
ensure that an adequate heat sink is used.
The case is connected to V
electrical isolation may be required for some applications.
Thermal compound should always be used with high current
regulators such as these.
The thermal characteristics of an IC depend on the
following four factors:
1. Maximum Ambient Temperature T
V
2. Power dissipation P
OUT
3. Maximum junction temperature T
4. Thermal resistance junction to ambient R
C
2
These four are related by the equation
R
1
R
2
The maximum ambient temperature and the power
dissipation 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:
P D(max) + { V IN(max) * V OUT(min) } I OUT(max) ) V IN(max) I Q
where:
V
IN(max)
V
OUT(min)
I
OUT(max)
application
I
is the maximum quiescent current at I
Q
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
Conductor Parasitic
outside environment has a thermal resistance. Like series
Resistance
electrical resistances, these resistances are summed to
C
determine R
junction and the surrounding air.
R
1. Thermal Resistance of the junction to case, R
LOAD
(°C/W)
2. Thermal Resistance of the case to Heat Sink, R
(°C/W)
3. Thermal Resistance of the Heat Sink to the ambient
air, R
These are connected by the equation:
http://onsemi.com
6
on the CS52015−1,
OUT
(°C)
A
(Watts)
D
(°C)
J
qJA
T J + T A ) P D
R QJA
is the maximum input voltage,
is the minimum output voltage,
is the maximum output current, for the
OUT(max)
, the total thermal resistance between the
qJA
(°C/W)
qSA
R QJA + R QJC ) R QCS ) R QSA
(°C/W)
(1)
(2)
.
qJC
qCS
(3)

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