Positive High-Voltage, Hot-Swap Controller
_______________________________________________________________________________________ 9
Detailed Description
The MAX5932 is a fully integrated hot-swap controller
for positive supply rails. The device allows for the safe
insertion and removal of circuit cards into live backplanes
without causing glitches on the backplane power-supply
rail. During startup the MAX5932 acts as a current regula-
tor using an external sense resistor and MOSFET to limit
the amount of current drawn by the load.
The MAX5932 features latched-off fault management.
When an overcurrent or an overtemperature fault
occurs, the MAX5932 turns the external MOSFET off
and keeps it off. After the fault condition goes away,
cycle the power supply or toggle ON low and high
again to unlatch the device.
The MAX5932 operates from +9V to +80V supply volt-
age range and has a default undervoltage lockout
(UVLO) set to +8.3V. The UVLO threshold is adjustable
using a resistive divider connected from V
CC
to ON to
GND (see R1 and R2 in Figure 5).
The MAX5932 monitors the input voltage, the output volt-
age, the output current, and the die temperature. This
device features a power-good output (PWRGD) to indi-
cate the status of the output voltage by monitoring the
voltage at FB (see the Power-Good Detection section).
As shown in Figure 5, a sense resistor is connected
between V
CC
and SENSE to sense the load current.
The device regulates the voltage across the sense
resistor (V
IN
- V
SENSE
) to 47mV when the voltage at FB
e 0.5V. The current-limit threshold (V
SENSETRIP
)
decreases linearly from 47mV to 12mV as FB decreases
from 0.5V to 0V.
An undervoltage fault is detected when ON goes below
the threshold, V
ONL
= 1.233V, which causes the voltage
at GATE to go low, and results in turning off the MOSFET.
To turn the MOSFET on again, ON must pass the V
ONH
=
1.313V threshold.
R6
1k&
5%
C1
10nF
D1
CMPZ5248B
Q1
IRF530
R5
10&
5%
R
SENSE
0.025&
R3
59k&
1%
R4
3.57k&
1%
R7
24k&
5%
C
L
R2
3.4k&
1%
R1
49.9k&
1%
C2
0.68礔
MAX5932
PWRGD
GND
V
IN
24V
TIMER
ON
PWRGD
FB
GND
V
CC
SENSE
GATE
5
1
3
2
4
8
7
6
0.1礔
Figure 5. Application Circuit
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