UCS1002-3 datasheet(32/114 Pages) MICROCHIP

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UCS1002-3

DS20006852A-page 32

 2023 Microchip Technology Inc. and its subsidiaries

FIGURE 7-1:

Trip Current Limiting Operation.

7.1.4.2

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

 1.5A). It is also used in BC1.2 CDP

mode and during the DCE Cycle when a charger emu-

lation profile is being applied and the emulation timeout

is active.

In CC mode, the port power switch enables 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 7-2 shows operation of current limits while using

CC mode. Unlike trip mode, once IBUS current

exceeds ILIM, operation continues at a reduced

voltage and increased current. Note that the shaded

0.5

1.0

1.5

2.0

2.5

5.25

4.75

IBUS (Amps)

Operating

Current

0.9

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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