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UCC28951QPWRQ1 Datasheet(PDF) 46 Page - Texas Instruments

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Part # UCC28951QPWRQ1
Description  Phase-Shifted Full-Bridge Controller
Download  71 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC28951QPWRQ1 Datasheet(HTML) 46 Page - Texas Instruments

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BUDGET
BUDGET
QE
P
P
2 P
6.5 W
=
-
´
»
QE
P
9.3 W
»
2
2
OUT
QE
QE _ RMS
ds(on)QE
dsQE
r
f
SW
OSS _ QE _ AVG
dsQE
SW
gQE
gQE SW
OUT
P
P
I
R
V
t
t f
2 C
V
f
2 Q
V
f
V
u
u
u
u
u
u
r
f
P
100nC
52nC
48nC
t
t
24 ns
I
4A
2
2
-
»
=
=
»
P
I
4 A
»
MILLER _ MIN
QE
52nC
»
MILLER _ MAX
QE
100nC
»
46
UCC28951-Q1
SLUSCK4 – OCTOBER 2016
www.ti.com
Product Folder Links: UCC28951-Q1
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
To estimate FET switching loss the Vg vs. Qg curve from the FET data sheet needs to be studied. First the gate
charge at the beginning of the miller plateau needs to be determined (QEMILLER_MIN) and the gate charge at the
end of the miller plateau (QEMILLER_MAX) for the given VDS.
Maximum gate charge at the end of the miller plateau:
(90)
Minimum gate charge at the beginning of the miller plateau:
(91)
NOTE
The FETs in this design are driven with a UCC27324 Gate Driver IC, setup to drive 4-A
(IP) of gate drive current.
(92)
Estimated FET Vds rise and fall time:
(93)
Estimate QE and QF FET Losses (PQE):
(94)
(95)
Recalculate the power budget.
(96)


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