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Figure 11a shows how to program the undervoltage
and overvoltage trip thresholds using three resistors.
With R4 = 562k&, R5 = 9.09k&, and R6 = 10k&, the
undervoltage threshold is set to 37.2V (with a 37.8V
release from undervoltage) and the overvoltage is set
to 71.1V (with a 69.9V release from overvoltage).
More hysteresis can be added to the undervoltage
lockout with the circuit shown in Figure 11b. Resistor
R3 connected between GATE and UV lowers the sup-
ply undervoltage lockout threshold (supply voltage
decreasing) to:
where V
UVL
is typically 1.223V. The supply voltage to
release from undervoltage lockout (supply voltage
increasing) is:
where V
UVH
is typically 1.243V. The supply undervolt-
age lockout hysteresis is the difference, or:
where V
UVHY
is typically 20mV.
V
V
R    R    R   R    R   R
R    R
V
R
R
UVHYS    UVHY
GATE
,
=
?nbsp   +    ?nbsp   +    ?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
2    3    1    3    1    2
2    3
1
3

V
V
R   R   R   R   R   R
R   R
UVLH
UVH
,
=
?nbsp   +   ?nbsp   +   ?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
2   3   1   3   1   2
2   3
V
V
R    R    R   R    R   R
R    R
V
R
R
UVHL
UVL
GATE
,
=
?nbsp   +    ?nbsp   +    ?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>

?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
2    3    1    3    1    2
2    3
1
3

-48V Hot-Swap Controllers
with External R
SENSE
12   ______________________________________________________________________________________
V
EE
V
DD
OV
UV
MAX5948A
MAX5948B
-48V RTN
-48V
V
UV
 = 1.223
R4 + R5 + R6
 
R5 + R6
R4
R5
R6
-48V RTN
(SHORT PIN)
V
OV
 = 1.223
R4 + R5 + R6
 
R6
Figure 11a. Undervoltage and Overvoltage Sensing
V
EE
SENSE
GATE
V
DD
UV
OV
MAX5948
-48V RTN
= 37.6V
UV
-48V RTN
(SHORT PIN)
*
-48V
*DIODES INC. SMAT70A.
R1
562k&
1%
R4
506k&
1%
R2
16.9k&
1%
R5
8.87k&
1%
R7
0.02&
5%
R6
10&
5%
C1
150nF
25V
Q1
IRF530
R3
1.62M&
1%
= 43V
UV
= 71V
OV
Figure 11b. Programmable Hysteresis For Undervoltage
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