Datasheet

MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
8 _______________________________________________________________________________________
0.483
0.484
0.486
0.485
0.487
0.488
-40 0-20 20 40 60 80
CS THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX5942 toc20
TEMPERATURE (
°
C)
CS THRESHOLD VOLTAGE (V)
FB = V-
NDRV RESISTANCE
vs. TEMPERATURE
MAX5942 toc21
1.0
1.5
2.5
2.0
4.0
4.5
3.5
3.0
5.0
NDRV RESISTANCE (Ω)
-40 0 20-20
40
60 80
TEMPERATURE (
°
C)
HIGH-SIDE DRIVER
LOW-SIDE DRIVER
-40 -20 0 20 40 60 80
CURRENT-LIMIT DELAY
vs. TEMPERATURE
MAX5942 toc22
TEMPERATURE (
°
C)
CURRENT-LIMIT DELAY (ns)
188
190
192
194
196
198
200
202
204
206
208
210
FB = V-, 100mV OVERDRIVE ON CS
2.400
2.402
2.406
2.404
2.408
2.410
010155 2025303540
V
SS_SHDN
vs. V
DD
MAX5942 toc23
V
DD
(V)
V
SS_SHDN
(V)
267.0
268.0
267.5
269.0
268.5
269.5
270.0
270.5
271.0
010155 2025303540
NDRV FREQUENCY vs. V
DD
MAX5942 toc24
V
DD
(V)
NDRV FREQUENCY (kHz)
FB = 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.
179.0
180.0
179.5
180.5
182.0
181.5
181.0
182.5
-40 -20 0 20 40 60 80
V+ SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5942 toc19
TEMPERATURE (
°
C)
V+ SHUTDOWN CURRENT (µA)
V+ = 67V, FB = SS_SHDN = V-