Datasheet

MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
_______________________________________________________________________________________ 7
INRUSH CURRENT CONTROL
(V
IN
= 48V)
MAX5941toc10
V
GATE
5V/div
I
INRUSH
100mA/div
V
OUT
50V/div
P
GOOD
50V/div
2ms/div
INRUSH CURRENT CONTROL
(V
IN
= 67V)
MAX5941toc11
V
GATE
5V/div
I
INRUSH
100mA/div
V
OUT
50V/div
P
GOOD
50V/div
2ms/div
0.999
1.000
1.001
1.002
1.003
-40 0-20 20 40 60 80
V
SS_SHDN
vs. TEMPERATURE
(AT THE END OF SOFT-START)
MAX5941A/B toc12
TEMPERATURE (
°
C)
OPTO = CS = V-
V
SS_SHDN
(V) (NORMALIZED TO V
REF
= 2.4V)
273
274
276
275
277
278
-40 0-20 20 40 60 80
NDRV FREQUENCY
vs. TEMPERATURE
MAX5941A/B toc13
TEMPERATURE (
°
C)
NDRV FREQUENCY (kHz)
V
OPTO
= 4V, CS = V-
80.4
80.6
80.5
80.8
80.7
80.9
81.0
-40 20 40-20 0 60 80
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5941A/B toc14
TEMPERATURE (
°
C)
MAXIMUM DUTY CYCLE (%)
V
OPTO
= 4V, CS = V-
46.8
47.2
47.0
47.6
47.4
47.8
48.0
-40 20 40-20 0 60 80
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5941A/B toc15
TEMPERATURE (°C)
MAX DUTY CYCLE (%)
V
OPTO
= 4V, CS = V-
V+ SUPPLY CURRENT
vs. TEMPERATURE
MAX5941A/B toc16
1.38
1.39
1.41
1.40
1.44
1.45
1.43
1.42
1.46
V+ INPUT CURRENT (mA)
-40 0 20-20
40
60 80
TEMPERATURE (°C)
V
OPTO
= 4V, V
DD
= CS = V-
Typical Operating Characteristics (continued)
(V
IN
= (GND - V
EE
) = 48V, GATE = PGOOD = PGOOD = OUT = OPEN, UVLO = V
EE
, V
DD
= 13V, NDRV floating, T
A
= T
MIN
to T
MAX
.
Typical values are at T
A
= +25°C. All voltages are referenced to V
EE
(for graphs 1–11 in the Typical Operating Characteristics), all
voltages are referenced to V- (for graphs 12–30 in the Typical Operating Characteristics), unless otherwise noted.)