The UV pin is also used to reset the circuit breaker after
a fault condition has occurred. The UV pin can be pulled
below V
UVL
to reset the circuit breaker.
Figure 12 shows how to program the undervoltage and
overvoltage trip thresholds using three resistors. With R4
= 549k&, R5 = 6.49k&, and R6 = 10k&, the undervoltage
threshold is set to 38.5V (with a 43V release from under-
voltage), and the overvoltage is set to 71V. The resistor-
divider also increases the hysteresis of the overvoltage
and overvoltage lockout, to 4.5V and 1.1V at the input
supply, respectively.
PWRGD/PWRGD Output
The PWRGD (PWRGD) output can be used directly to
enable a power module after hot insertion. The
MAX5949A (PWRGD) can be used to enable modules
with an active-low enable input (Figure 14), while the
MAX5949B (PWRGD) is used to enable modules with
an active-high enable input (Figure 13).
The PWRGD signal is referenced to the DRAIN termi-
nal, which is the negative supply of the power module.
The PWRGD signal is referenced to V
EE
.
-48V Hot-Swap Controllers
with External R
SENSE
12 ______________________________________________________________________________________
GATE
2V/div
NODE2
50V/div
1s/div
V
EE
SENSE
GATE
DRAIN
V
DD
OV
UV
PWRGD
MAX5949A
-48V RTN
-48V RTN
(SHORT PIN)
*
-48V
*DIODES INC. SMAT70A.
R4
549k&
1%
R8
510k&
5%
R5
10k&
1%
R6
549k&
1%
R7
1M&
5%
R9
6.49k&
1%
R1
0.02&
5%
R3
1k&
5%
R2
10&
5%
C1
470nF
25V
C4
1礔
100V
N
Q1
IRF530
D1
1N4148
Q2
2N2222
Q3
ZVN3310
C2
15nF
100V
C3
100礔
100V
NODE2
Figure 11. Automatic Restart After Current Fault
V
EE
V
DD
OV
UV
MAX5949A
MAX5949B
-48V RTN
-48V
V
UV
= 1.255
R4 + R5 + R6
R5 + R6
R4
R5
R6
-48V RTN
(SHORT PIN)
3
2
4
8
V
OV
= 1.255
R4 + R5 + R6
R6
Figure 12. Undervoltage and Overvoltage Sensing
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