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UCC28950PW Datasheet(PDF) 57 Page - Texas Instruments

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Part # UCC28950PW
Description  Green Phase-Shifted Full-Bridge Controller
Download  74 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC28950PW Datasheet(HTML) 57 Page - Texas Instruments

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QC
g
QD
g
QD
d
t
CDSET
= t
1 - t 0
Set t
CDSET
at resonant tank Peak and Valley
t
0
t
1 t 2
t
3
t
4
t
CDSET
= t
4 - t 3
Miller Plateau
t
5
Miller Plateau
t
MILLER
= t
2 - t 1
t
MILLER
= t
5 - t 4
CD
R
30.1k
=
W
(
)
CDSET
CD
A
T
R
0.26
CS
K
1.3
30.6k
5
=
´
+
´
´
»
W
ABSET
CDSET
t
t
=
UCC28950
www.ti.com
SLUSA16C – MARCH 2010 – REVISED NOVEMBER 2015
The QC and QD turnon delays (tCDSET) should be initially set for the same delay as the QA and QB turn on
delays (Pin 6). The following equations program the QC and QD turn-on delays (tCDSET) by properly selecting
resistor RDELCD (Pin 7).
(153)
Resistor RCD programs tCDSET:
(154)
Select a standard resistor for the design:
(155)
NOTE
Once you have a prototype up and running it is recommended to fine tune tCDSET at light
load. In this design the CD node was set to valley switch at roughly 10% load. Please
refer to Figure 54. Obtaining ZVS at lighter loads with switch node QDd is easier due to
the reflected output current present in the primary of the transformer at FET QD and QC
turnoff/on. This is because there was more peak current available to energize LS before
this transition, compared to the QA and QB turnoff/on.
Figure 54. tCDSET to Achieve Valley Switching at Light Loads
Copyright © 2010–2015, Texas Instruments Incorporated
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