PD77728 datasheet(14/44 Pages) MICROCHIP

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PD77728

Electrical Specifications

Data Sheet

DS00003920E - 14

Table 3-7. Current Limit (ILIM)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Port current limit

ILIM

Class 0–Class 3, 2-pair single signature

—

0.720

—

Class 4, 2-pair single signature

—

0.850

—

Class 4, 4-pair dual signature

—

0.850

—

Class 5, 4-pair single signature

—

0.850

—

Class 6, 4-pair single signature

—

0.890

—

Class 7, 4-pair single signature

—

1.000

—

Class 8, 4-pair single signature

Class 5, 4-pair dual signature

—

1.200

—

Inrush current limit

IINRUSH_B

ILIM setting ILIM_2P_B

0.400

0.425

0.450

Table 3-8. Power Accuracy

Parameter

Conditions

Min.

Typ.

Max.

Single port (2 pairs) power accuracy

Port power: 5W to 15W

−5.0%

—

5.0%

Port power: 15W to 55W

−2.5%

—

2.5%

2 ports (4 pairs) power accuracy

Total 4-pair power: 5W to 30W

−5.0%

—

5.0%

Total 4-pair power: 30W to 100W

−2.5%

—

2.5%

Table 3-9. Detection and Connection Check

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Accept signature resistance

RDET

—

kΩ

Accept signature capacitance

CDET

—

0.15

µF

Reject signature resistance (low)

RREJ

—

kΩ

Reject signature resistance (high)

RREJ

—

kΩ

Reject signature capacitance

CREJ

—

µF

Detection open circuit resistance

ROC

—

0.5

—

MΩ

Valid detection test voltage

VVALID

—

2.8

—

Detection open circuit voltage

VOC

—

Total detection timing

TDET

—

400

Table 3-10. Classification

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Measured ICLASS at PSE

ICLASS

Class Signature 0

—

Class Signature 1

—

Class Signature 2

—

Class Signature 3

—

Class Signature 4

—

Table 3-11. Real-Time Protection

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Short Circuit

Protection (SCP)

disconnection

time

TSCP

Port in current limit,

VPORT < 40V, no bouncing

—

100

—

µs

Overload

protection (TLIM)

TLIM_2P

Port in current limit, VPORT ≥ 40V

Class 1 to Class 6

—

Port in current limit, VPORT ≥ 40V

Class 7 and Class 8

—

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