MAX5940BESA datasheet(8/15 Pages) MAXIM

部件名	MAX5940BESA

功能描述	IEEE 802.3af PD Interface Controller For Power-Over-Ethernet

PDF	15 Pages

Scroll/Zoom	100%

制造商	MAXIM [Maxim Integrated Products]

网页	https://www.maximintegrated.com/en.html

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8 / 15 page

To adjust the UVLO threshold (MAX5940B only), con-

nect an external resistor-divider from GND to UVLO

and from UVLO to VEE. Use the following equations to

calculate R1 and R2 for a desired UVLO threshold:

R1 = 25.5k

Ω - R2

where VIN,EX is the desired UVLO threshold. Since the

resistor-divider replaces the 25.5k

Ω PD detection resis-

tor, ensure that the sum of R1 and R2 equals 25.5k

Ω

±1%. When using the external resistor-divider, the

MAX5940B has an external reference voltage hystere-

sis of 20% (typ). When UVLO is programmed external-

ly, the turn-off threshold is 80% (typ) of the new UVLO

threshold.

REF UVLO

IN EX

225 5

Ω

IEEE 802.3af PD Interface Controller

For Power-Over-Ethernet

_______________________________________________________________________________________

GND

UVLO

GND

(UVLO)

( ) MAX5940B.

GATE

MAX5940B

CLASSIFICATION

RCLASS

(PGOOD)

6.8V

REF

2.46V

200mV

VEE

VGATE

1.2V, REF

5V, REF

PGOOD

OUT

20%

Figure 2. Block Diagram

UVLO

GND

VEE

VIN = 12V TO 67V

MAX5940B

Figure 3. Setting Undervoltage Lockout with an External

Resistor-Divider

MAX5940BESA 数据表(PDF) 8 Page - Maxim Integrated Products

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