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RT9553A Folha de dados(PDF) 11 Page - Richtek Technology Corporation

Nome de Peças RT9553A
Descrição Electrónicos  High Accuracy Current/Voltage Sensing and Protection IC
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Fabricante Electrônico  RICHTEK [Richtek Technology Corporation]
Página de início  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9553A Folha de dados(HTML) 11 Page - Richtek Technology Corporation

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RT9553A
11
DS9553A-00
September 2014
www.richtek.com
©
Copyright
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Thermal Considerations
For continuous operation, do not exceed absolute
maximum junction temperature. The maximum power
dissipation depends on the thermal resistance of the IC
package, PCB layout, rate of surrounding airflow, and
difference between junction and ambient temperature. The
maximum power dissipation can be calculated by the
following formula :
PD(MAX) = (TJ(MAX)
− TA) / θJA
where TJ(MAX) is the maximum junction temperature, TAis
the ambient temperature, and
θJAis the junction to ambient
thermal resistance.
For recommended operating condition specifications, the
maximum junction temperature is 125
°C. The junction to
ambient thermal resistance,
θJA, is layout dependent. For
WDFN-10L 3x3 package, the thermal resistance,
θJA, is
30.5
°C/W on a standard JEDEC 51-7 four-layer thermal
test board. The maximum power dissipation at TA = 25
°C
can be calculated by the following formula :
PD(MAX) = (125
°C − 25°C) / (30.5°C/W) = 3.27W for
WDFN-10L 3x3 package
The maximum power dissipation depends on the operating
ambient temperature for fixed TJ(MAX) and thermal
resistance,
θJA. The derating curve in Figure 6 allows the
designer to see the effect of rising ambient temperature
on the maximum power dissipation.
Figure 6. Derating Curve of Maximum Power Dissipation
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
25
50
75
100
125
Ambient Temperature (°C)
Four-Layer PCB
Layout Considerations
Layout is very important in RT9553A, if designed
improperly, the PCB may radiate excessive noise. Certain
points must be considered before starting a layout for the
RT9553A.
Connect a RC low pass filter to VCC. The recommended
BOM of RC filter is 2.2
Ω and 0.1μF. Place the filter
capacitor close to the IC.
Current sense connections must always be made using
Kelvin connections to ensure an accurate signal with
the current limit resistor located at the device.
All sensitive analog traces and components such as
CSP, CSN, VCC, EN, PROCHOT, RESET and ILIM
should be placed away form high voltage switching
nodes to avoid coupling.
Figure 5. UVP and RESET Indicator Illustrator
EN
VCC
3ms
VCSP x (1/9)
UVSET
RESET
108%_UVSET
Recovery Hysteresis Range


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