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below the current limit, the circuit breaker does not trip.
For C2 values less than 10nF, a positive voltage step on
the input supply can result in Q1 turning off momentarily,
which can shut down the output. By adding an additional
resistor and diode, Q1 remains on during the voltage
step. This is shown as D1 and R7 in Figure 10. The pur-
pose of D1 is to shunt current around R7 when the power
pins first make contact and allow C1 to hold the GATE
low. The value of R7 should be sized to generate an
R7 x C1 time constant of 33祍.
Undervoltage and Overvoltage
Protection
The UV and OV pins can be used to detect undervoltage
and overvoltage conditions. The UV and OV pins are
internally connected to analog comparators with 130mV
(UV) and 20mV (OV) of hysteresis. When the UV voltage
falls below its threshold or the OV voltage rises above its
threshold, the GATE pin is immediately pulled low. The
GATE pin is held low until UV goes high and OV is low,
indicating that the input supply voltage is within specifica-
tion. The MAX5949_ includes an internal lockout (UVLO)
that keeps the external MOSFET off until the input supply
voltage exceeds 15.4V, regardless of the UV input.
-48V Hot-Swap Controllers
with External R
SENSE
______________________________________________________________________________________   11
GATE - V
EE
10V/div
I
D
 (Q1)
5A/div
DRAIN
50V/div
1ms/div
Figure 8. Short-Circuit Protection Waveform
DRAIN
20V/div
I
D
 (Q1)
5A/div
V
EE
20V/div
400祍/div
Figure 9. Voltage Step on Input Supply
V
EE
SENSE
GATE
DRAIN
V
DD
OV
UV
PWRGD
MAX5949A
-48V RTN
-48V
R4
549k&
1%
R5
6.49k&
1%
R6
10k&
1%
R1
0.02&
5%
R3
1k&
5%
R2
10&
5%
C1
150nF
25V
Q1
IRF530
C2
3.3nF
100V
*
-48V RTN
(SHORT PIN)
R7
220&
5%
D1
BAT85
C4
22礔
100V
C3
0.1礔
100V
*DIODES INC. SMAT70A.
Figure 10. Circuit for Input Steps with Small C1
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