max5924deubt Maxim Integrated Products, Inc., max5924deubt Datasheet - Page 16

• Manufacturer Part Number: max5924deubt
• Description: 1v To 13.2v, N-channel Hot-swap Controllers Require No Sense Resistor
• Manufacturer: Maxim Integrated Products, Inc.

1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
To determine the proper circuit-breaker resistor value
use the following equation, which refers to Figure 12:
where I
current.
The fast-comparator trip current is determined by the
selected R
dently. The fast-comparator trip current is given by:
SC_DET must be connected to OUT through the select-
ed R
When operating with R
breaker threshold using the worst possible operating
conditions, and add a 20% overcurrent margin to the
maximum circuit current. For example, with a maximum
expected current of 2A, using a 20% margin, the cur-
rent for calculation is (2A) x (1.2) = 2.4A. The resulting
Figure 12. Circuit Breaker Using R
16
SC
______________________________________________________________________________________
R
I
V
TRIPFAST
S
CB
MAX5925
MAX5926
TRIPSLOW
when not using R
SELECT
TC
CB
R
I
CB
TRIPSLOW
value and cannot be adjusted indepen-
CB
I
is the desired slow-comparator trip
CB
R
CBF
I
CB
R
I
DS(ON)
GATE
LOAD
x R
SENSE
SENSE
x R
CBF
R
DS ON T
I
DS(ON)
SENSE
DS ON T
CB
.
, calculate the circuit-
(
V
V
CB,OS
CB,OS
(
V
V
CBF,TH
CB,TH
R
) ( )
OUT
CB
) ( )
R
V
V
OUT
SENSE
V
CB OS
CB OS
SLOW
COMPARATOR
FAST
COMPARATOR
,
,
Mode
minimum circuit-breaker threshold is then a product of
this current and R
0.144V. Using this method to choose a false circuit-
breaker threshold allows the circuit to operate under
worst-case conditions without causing a circuit-breaker
fault, but the circuit-breaker function will still detect a
short-circuit or a gross overcurrent condition.
To determine the proper circuit-breaker resistor value,
use the following equation, which refers to Figure 13:
where, I
current.
The fast-comparator trip current is determined by the
selected R
dently. The fast-comparator trip current is given by:
SC_DET should be connected to V
R
Figure 13. Circuit Breaker Using R
SENSE
I
TRIPFAST
R
V
S
.
CB
MAX5925
MAX5926
TRIPSLOW
SELECT
TC
CB
R
value and cannot be adjusted indepen-
CB
I
TRIPSLOW
I
SENSE
CB
CB
is the desired slow-comparator trip
R
CBF
I
CB
R
I
LOAD
SENSE
x R
= 0.06 , or (0.06 ) x (2.4A) =
x R
CBF
I
SENSE
SENSE
R
SENSE
CB
V
V
SENSE
CB,OS
CB,OS
V
V
CBF,TH
CB,TH
R
GATE
CB
CC
V
CB OS
V
OUT
when using
CB OS
SLOW
COMPARATOR
FAST
COMPARATOR
,
,
V
OUT