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UCS1002-2 датащи(PDF) 50 Page - Microchip Technology

номер детали UCS1002-2
подробное описание детали  Programmable USB Port Power Controller with Charger Emulation
PDF  114 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

UCS1002-2 датащи(HTML) 50 Page - Microchip Technology

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Programmable USB Port Power Controller with Charger Emulation
Datasheet
Revision 1.4 (07-16-13)
50
SMSC UCS1002
DATASHEET
7.2.4.2
Constant Current Limiting (Variable Slope)
Constant current limiting is used when a portable device handshakes using the BC1.2 DCP charger
emulation profile and the current drawn is greater than ILIM (and ILIM < 1.5 A). It’s also used in BC1.2
CDP mode and during the DCE Cycle when a charger emulation profile is being appliedand the
emulation timeout is active.
In CC mode, the port power switch allows the attached portable device to reduce VBUS output voltage
to less than the input VS voltage while maintaining current delivery. The V/I slope depends on the user
set ILIM value. This slope is held constant for a given ILIM value.
Figure 7.1 Trip Current Limiting Operation
5
4
3
2
1
0.5
1.0
1.5
2.0
2.5
5.25
4.75
IBUS (Amps)
Operating
Current
0
0
0.9
1.2
1.2
1.0
0.9
0.5
1.5
2.5
1.8
2.0
= ILIM’s
1.8
Power Switch Voltage and Current Output
go to Zero when ILIM is Exceeded
Trip action
(ILIM = 0.5 A)
Trip action
(ILIM = 2.5 A)
ILIM (Amps)



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