MAX5941AESE+T Maxim Integrated Products, MAX5941AESE+T Datasheet - Page 16

• Manufacturer Part Number: MAX5941AESE+T
• Description: IC IEEE 802.3AF-COMP POE 16-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX5941AESE+T

• Controller Type: Power over Ethernet Controller (POE)
• Interface: IEEE 802.3af
• Voltage - Supply: 48V
• Current - Supply: 1mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
to 2.4V, the internal voltage reference. Pull V
below 0.25V to disable the controller.
Undervoltage lockout shuts down the controller when
V
erence remain on during shutdown.
The current-sense (CS) comparator and its associated
logic limit the peak current through the MOSFET.
Current is sensed at CS as a voltage across a sense
resistor between the source of the MOSFET and GND.
To reduce switching noise, connect CS to the external
Figure 5. Forward Converter
16
CC
______________________________________________________________________________________
is less than 6.6V. The regulators for V+ and the ref-
25.5kΩ
R
DISC
Current-Sense Comparator
(30V TO 72V)
R
CL
0.1µF
47µF
C
V
C
DD
IN
SS
1N4148
V
UVLO
RCL
GATE
PGOOD
SS_SHDN
PGOOD
V
DD
EE
MAX5941B
6
GND
N
T
SS_SHDN
V+
NDRV
OPTO
OUT
V
CS
CC
V-
3kΩ
14
CMHD2003
N
IRF640N
R
100Ω
C
3 × 0.47µF
4.75kΩ
M1
IN
240kΩ
MOSFET source through a 100Ω resistor or an RC low-
pass filter (Figures 5, 6). Select the current-sense resis-
tor, R
where I
current.
When V
The propagation delay from the time the switch current
reaches the trip level to the driver turn-off time is 170ns.
14
N
P
OPTOCOUPLER
250VAC
4.7nF
R
100mΩ
10µF
SENSE
C
SENSE
CC
20Ω
N
LimPrimary
5
CS
S
, according to the following equation:
> 465mV, the power MOSFET switches off.
1nF
R
TLV431
SBL204OCT
SENSE
220Ω
is the maximum peak primary-side
0.1µF
= 0 465
3 × 560µF
4.7µH
.
L1
C
OUT
R
25.5kΩ
R
8.25kΩ
/ V
1
2
I
LimPrimary
0.1µF
V
OUT
5V/10A