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TPS65321A-Q1 Datasheet(PDF) 29 Page - Texas Instruments

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Part # TPS65321A-Q1
Description  36-V Step-Down Converter With Eco-mode and LDO Regulator
Download  43 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65321A-Q1 Datasheet(HTML) 29 Page - Texas Instruments

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Ambient Temperature (qC)
0.5
125
150
1
100
1.5
75
2
2.5
3
25
50
0
0
29
TPS65321A-Q1
www.ti.com
SLVSE55 – NOVEMBER 2017
Product Folder Links: TPS65321A-Q1
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
8.2.1.2.12
Power Dissipation Losses of the LDO Regulator
PLDO = (VVIN_LDO – V(LDO_OUT)) × I(LDO_OUT)
(45)
8.2.1.2.13
Total Device Power Dissipation Losses and Junction Temperature
1. Supply loss:
PIC = VI × IQ-normal
(46)
2. Total power loss:
PTotal = PCON + PSW + PGate + PLDO + PIC
(47)
For a given operating ambient temperature TA:
TJ = TA + Rth × PTotal
where
TJ is the junction temperature in °C
TA is the ambient temperature in °C
Rth is the thermal resistance of package in (°C/W)
PTotal is the total power dissipation (W)
(48)
For a given maximum junction temperature TJ-max = 150°C, the allowed Total power dissipation is given as:
TA-max = TJ-max -Rth × PTotal
(49)
where
TA-max is the maximum ambient temperature in °C
TJ-max is the maximum junction temperature in °C
(50)
Additional power losses occur in the regulator circuit because of the inductor AC and DC losses, the Schottky
diode, and trace resistance that impact the overall efficiency of the regulator.
Figure 17 shows the thermal derating profile of the 14-pin HTSSOP Package With PowerPAD™ . It is important
to consider additional cooling strategies if necessary to maintain the junction temperature of the device below the
maximum junction temperature of 150 °C.
Figure 17. Thermal Derating Profile ofTPS65321A-Q1 in 14-pin HTSSOP Package With PowerPAD


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