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UCD3138 데이터시트(PDF) 41 Page - Texas Instruments

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부품명 UCD3138
상세설명  Highly Integrated Digital Controller for Isolated Power
PDF  68 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI1 - Texas Instruments

UCD3138 데이터시트(HTML) 41 Page - Texas Instruments

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T
s
t
a 31
t
a 32
t
a 41
t
a 42
t
a 51
t
a 52
t
a 62
t
a 61
w
1
d
w
2
w
2
Ipri
Ramp
T
s
t
a 31
t
a 32
t
a 51
t
a 52
t
a 62
t
a 61
d
Phase_Shift Mode
PWM
DPWM3A
DPWM3B
DPWM2A
DPWM2B
DPWM0A
DPWM0B
d
d
d
d
a2
a1
a3
a4
fs< fr
fr
fs> fr
PWM
Mode
LLC Mode
Tr = 1/fr
Tr = 1/fr
i s
fs = fr_max
UCD3138
www.ti.com
SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012
4.12.2 LLC Example
In LLC, three modes are used. At the highest frequency, a pulse width modulated mode (Multi Mode) is
used. As the frequency decreases, resonant mode is used. As the frequency gets still lower, the
synchronous MOSFET drive changes so that the on-time is fixed and does not increase. Here are the
waveforms for the LLC:
Copyright © 2012, Texas Instruments Incorporated
Functional Overview
41
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Product Folder Link(s): UCD3138



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