Datasheet

MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
12 ______________________________________________________________________________________
MAX5941A/MAX5941B
R1
21.8V
39V
GND
UVLO
GND
UVLO
GATE
R2
R3
MAX5941B
CLASSIFICATION
RCL
PGOOD
6.8V
EN
REF
2.4V, 0.8
HYST
2.4V,
REF
200mV
V
EE
V
GATE
, 6V
1.2V, REF
5V, REF
Q4
PGOOD
OUT
Q3
Q1
Q2
EN
Figure 2. Powered Device Interface Block Diagram
CLASS CURRENT SEEN AT V
IN
(mA)
IEEE 802.3af PD CLASSIFICATION
CURRENT SPECIFICATION (mA)
CLASS R
CL
(Ω)V
IN
* (V)
MIN MAX MIN MAX
0 10k
12.6 to 20
0404
1 732
12.6 to 20
912912
2 392
12.6 to 20
17 20 17 20
3 255
12.6 to 20
26 30 26 30
4 178
12.6 to 20
36 42 36 44
*V
IN
is measured across the MAX5941 input pins (V
EE
and GND), which does not include the diode bridge voltage drop.
Table 2. Setting Classification Current