Electrical characteristics (continued) – Rainbow Electronics MAX5969B User Manual
Page 4
IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with
Integrated Power MOSFET
MAX5969A/MAX5969B
4 ______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= (V
DD
- V
SS
) = 48V, R
DET
= 24.9kω, R
CLS
= 615ω. RTN, WAD, PG, and 2EC unconnected, all voltages are referenced to V
SS,
unless otherwise noted. T
A
= T
J
= -40
N
C to +85
N
C, unless otherwise noted. Typical values are at T
A
= +25
N
C.) (Note 3)
Note 3: All devices are 100% production tested at T
A
= +25NC. Limits over temperature are guaranteed by design.
Note 4: The input offset current is illustrated in Figure 1.
Note 5: Effective differential input resistance is defined as the differential resistance between V
DD
and V
SS
. See Figure 1.
Note 6: Classification current is turned off whenever the device is in power mode.
Note 7: UVLO hysteresis is guaranteed by design, not production tested.
Note 8: A 20V glitch on input voltage that takes V
DD
below V
ON
shorter than or equal to t
OFF_DLY
does not cause the MAX5969A/
MAX5969B to exit power-on mode.
Note 9: In power mode, current-limit foldback is used to reduce the power dissipation in the isolation MOSFET during an overload
condition across V
DD
and RTN.
Figure 1. Effective Differential Input Resistance/Offset Current
I
IN
I
INi + 1
I
INi
I
OFFSET
dR
i
1V
V
INi
V
INi + 1
I
OFFSET
x I
INi
-
V
INi
dR
i
dR
i
x
(V
INi + 1
- V
INi
)
=
1V
(I
INi + 1
- I
INi
)
(I
INi + 1
- I
INi
)
V
IN