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UCS1001 датащи(PDF) 37 Page - Microchip Technology

номер детали UCS1001
подробное описание детали  USB Port Power Controller with Charger Emulation
PDF  59 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

UCS1001 датащи(HTML) 37 Page - Microchip Technology

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USB Port Power Controller with Charger Emulation
Datasheet
SMSC UCS1001
37
Revision 1.2 (05-21-12)
DATASHEET
6.2.4.2
Constant Current Limiting (Variable Slope)
Constant current limiting is used when a portable device handshakes using the BC1.2 DCP or Legacy
2 charger emulation profiles 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 applied
and the 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 6.1 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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