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UCD3138ARGCT Folha de dados(PDF) 50 Page - Texas Instruments

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Nome de Peças UCD3138ARGCT
Descrição Electrónicos  Highly-Integrated Digital Controller for Isolated Power
PDF  87 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

UCD3138ARGCT Folha de dados(HTML) 50 Page - Texas Instruments

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EXT CAP
AD02
400
Digital
RSHARE
250
3.3 V
ISHARE
ADC12 and
CMP
ESD
ESD
250
3. 2 k
ESD
AD13
3.3V
SW2
SW1
SW3
3.3 V
ADC12 and
CMP
50
UCD3138A
SLUSC66C – MARCH 2015 – REVISED SEPTEMBER 2016
www.ti.com
Submit Documentation Feedback
Product Folder Links: UCD3138A
Detailed Description
Copyright © 2015–2016, Texas Instruments Incorporated
The simplified current sharing circuitry is shown in the drawing below:
Figure 7-16. Simplified Current Sharing Circuitry
CURRENT SHARING MODE
FOR TEST ONLY,
ALWAYS KEEP 00
CS_MODE
EN_SW1
EN_SW2
DPWM
Off or Slave Mode (3-state)
00
00 (default)
0
0
0
PWM Bus
00
01
1
0
ACTIVE
Off or Slave Mode (3-state)
00
10
0
0
0
Analog Bus or Master
00
11
0
1
0
The period and the duty of 8-bit PWM current source and the state of the SW1 and SW2 switches can be
controlled through the current sharing control register (CSCTRL).
7.5.13 Temperature Reference
The temperature reference register (TEMPREF) provides the ADC12 count when ADC12 measures the
internal temperature sensor (channel 14) during the factory trim and calibration.
This information can be used by different periodic temperature compensation routines implemented in the
firmware. But it should not be overwritten by firmware, otherwise this factory written value is lost.
7.1
Device Functional Modes
The DPWM is a complex logic system which is highly configurable to support several different power
supply topologies. This section discusses waveforms, timing, and register settings, rather than ON-logic
design.
The DPWM functions using a period counter, which increments from 0 to PRD, then resets and begins to
increment again.
The DPWM logic causes transitions in many digital signals when the period counter reaches the target
value for that signal.



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