Datasheet

MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
_______________________________________________________________________________________ 9
0
2
14
6
4
8
10
12
16
0403010 20 50 60 70 80 90 110
V+ SUPPLY CURRENT vs. V+ VOLTAGE
(AFTER STARTUP)
MAX5942 toc28
V+ VOLTAGE (V)
V+ LEAKAGE CURRENT (µA)
100
V
DD
= 13V, FB = V-
1.51
1.53
1.52
1.56
1.55
1.54
1.59
1.58
1.57
1.60
04020 60 80 100
V+ SUPPLY CURRENT vs.
V+ VOLTAGE
MAX5942 toc27
V+ VOLTAGE (V)
V+ SUPPLY CURRENT (mA)
V
FB
= V
DD
= V-
9.0
9.4
9.2
9.8
9.6
10.2
10.0
10.4
V
CC
VOLTAGE vs. V
CC
CURRENT
MAX5942 toc29
V
CC
CURRENT (mA)
V
CC
VOLTAGE (V)
0 5 10 15 20
V+ = +67V, V
FB
= 4V
V
DD
= 36V
V
DD
= 13V
9.0
9.3
9.2
9.1
9.4
9.5
9.6
9.7
9.8
9.9
10.0
0 5 10 15 20
V
CC
VOLTAGE vs. V
CC
CURRENT
MAX5942 toc30
V
CC
CURRENT (mA)
V
CC
VOLTAGE (V)
V
DD
= GND, V
FB
= 4V
V+ = 67V
V+ = 48V
V+ = 36V
V+ = 24V
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.
47.0
47.2
47.1
47.4
47.3
47.6
47.5
47.7
47.9
47.8
48.0
010155 2025303540
MAX5942B
MAXIMUM DUTY CYCLE vs. V
DD
MAX5942 toc25
V
DD
(V)
MAXIMUM DUTY CYCLE (%)
V
FB
= 4V, CS = V-
DEVICE POWERED
FROM V+
DEVICE POWERED
FROM V
DD
9.5
9.6
9.8
9.7
10.0
10.1
9.9
10.2
010155 2025303540
V
CC
vs. V
DD
MAX5942 toc26
V
DD
(V)
V
CC
(V)
DEVICE POWERED FROM V
DD
DEVICE POWERED
FROM V+
FB = V-