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UCD3138128APFC Folha de dados(PDF) 30 Page - Texas Instruments

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Nome de Peças UCD3138128APFC
Descrição Electrónicos  UCD3138128A Highly-Integrated Digital Controller For Isolated Power
PDF  83 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

UCD3138128APFC Folha de dados(HTML) 30 Page - Texas Instruments

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SR0_ DPWM
SR1_ DPWM
DTC0
DTC1
DETECT_ BLANK
DETECT_ LEN
DETECT
DETECT
DETECT
DETECT
ADJUST
ADJUST
1
2
3
6
4
5
Thermal Pad
(GND)
CTRL
DTC
IN
VD
OUT
VCC
1
2
3
6
4
5
Thermal Pad
(GND)
CTRL
DTC
IN
VD
OUT
VCC
UCD3138xA
DPWM
module
SR1 DPWM
SR2 DPWM
Decoder
Dead Time
Control
Computation
Engine
DTC0
DTC1
Rising edge
optimization
control
Rising edge
optimization
control
SR1
SR2
UCD7138
UCD7138
Copyright © 2016, Texas Instruments Incorporated
30
UCD3138128A
SLUSC99 – JULY 2016
www.ti.com
Product Folder Links: UCD3138128A
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
Figure 14. Synchronous Rectifier Peripheral use with Synchronous Rectifier Driver
DTC0 and DTC1 are received body diode conduction inputs from UCD7138. SR0_DPWM and SR1_DPWM are
the DPWM waveforms for the SRs. The red and green edges are moving edges controlled by both the filter
output and the DTC interface. In each cycle, right after the falling edge of the SR DPWM waveform, a body diode
conduction time detection window is generated. The detection window is defined by both DETECT_BLANK and
DETECT_LEN registers. During this detection window, a 4-ns timer capture counts how long the body diode
conducts. Then the DPWM turn off edge of the next cycle is adjusted accordingly.
Figure 15. Timing Diagram of the DTC Interface



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