max5934aeeet Maxim Integrated Products, Inc., max5934aeeet Datasheet - Page 13

• Manufacturer Part Number: max5934aeeet
• Description: Max5934, Max5934a Positive High-voltage, Hot-swap Controllers With Selectable Fault Management And Status Polarity
• Manufacturer: Maxim Integrated Products, Inc.

changes in currents flowing through the power-supply
traces. This can cause inductive voltage spikes that
could exceed 85V. Use wider traces or heavier trace
plating and connect a 0.1µF capacitor between V
GND to minimize these inductive spikes. Use a transient
voltage suppressor (TVS) at the input to prevent damage
from voltage surges. An SMBJ54A is recommended.
At power-up, transistor Q1 (see the Typical Application
Circuit) is off until these three conditions are met:
• V
• V
• V
The voltage at GATE increases with a slope of 10µA/C1
(where C1 is shown in the Typical Application Circuit)
and I
R
the internal current-limit circuitry that adjusts the GATE
voltage to keep a constant voltage across R
Figure 9. Overvoltage Waveforms
Selectable Fault Management and Status Polarity
Positive High-Voltage, Hot-Swap Controllers with
SENSE
ON
CC
TIMER
INRUSH
exceeds the UVLO threshold
exceeds the turn-on threshold voltage
goes too high, the inrush current is limited by
stays below 1.233V
= C
OVERVOLTAGE WAVEFORMS
L
x 10µA / C1. When the voltage across
______________________________________________________________________________________
10µs/div
Power-Up Sequence
IN
50V/div
I
5A/div
GATE
50V/div
TIMER
10V/div
OUTPUT
50V/div
SENSE
SENSE
CC
.
and
If the MAX5934/MAX5934A die temperature reaches
+150°C, an overtemperature fault is generated. As a
result, GATE goes low and turns the external MOSFET
off. The MAX5934/MAX5934A die temperature must
cool down below +120°C before the overtemperature
fault condition is removed.
Kelvin connections are recommended for accurate cur-
rent sensing. Make sure the minimum trace width for
2oz copper is 1.5mm per amp. A width of 4mm per amp
is recommended.
Connect a resistive divider from V
possible to ON and have short traces from V
GND. To decrease induced noise connect a 0.1µF
capacitor between ON and GND (see Figure 10).
The external MOSFET must be thermally coupled to the
MAX5934/MAX5934A to ensure proper thermal shut-
down operation.
Figure 10. Recommended Layout for R2, R3, and R
Board Layout and Bypassing
IRF530
Thermal Shutdown
CC
to ON as close as
SENSE
CC
and
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