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UCC28951QPWRQ1 Datasheet(PDF) 55 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) 55 Page - Texas Instruments

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QA
g
QB
g
QB
d
t
ABSET
= t
1 - t 0
Set t
ABSET at resonant tank Peak and Valley
t
0
t
1 t 2
t
3
t
4
t
ABSET
= t
4 - t 3
Miller Plateau
t
5
Miller Plateau
t
MILLER
= t
2 - t 1
t
MILLER
= t
5 - t 4
AB
R
30.1k
=
W
(
)
ABSET
AB
A
T
R
0.26
CS
K
1.3
30.6k
5
=
´
+
´
´
»
W
A
ADEL
AHI
A
5 V
R
V
0.202 V
R
R
´
=
=
+
A
R
348
=
W
AHI
ADEL
A
ADEL
R
V
R
344
5V
V
´
=
»
W
-
55
UCC28951-Q1
www.ti.com
SLUSCK4 – OCTOBER 2016
Product Folder Links: UCC28951-Q1
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
Based on VADEL selection, calculate RA:
(148)
Select the closest standard resistor value for RA:
(149)
Recalculate VADEL based on resistor divider selection:
(150)
Resistor RAB programs tABSET:
(151)
Select a standard resistor value for the design:
(152)
NOTE
Once you have a prototype up and running it is recommended you fine tune tABSET at light
load to the peak and valley of the resonance between LS and the switch node
capacitance. In this design the delay was set at 10% load. Please refer to Figure 53.
Figure 53. tABSET to Achieve Valley Switching at Light Loads


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