MAX5933A MAXIM [Maxim Integrated Products], MAX5933A Datasheet - Page 12

• Manufacturer Part Number: MAX5933A
• Description: Positive High-Voltage, Hot-Swap Controllers
• Manufacturer: MAXIM [Maxim Integrated Products]

Positive High-Voltage, Hot-Swap Controllers
Figure 10. Overvoltage Detection
Figure 11. Overvoltage Waveforms
12
______________________________________________________________________________________
SHORT
GND
V
PIN
IN
OVERVOLTAGE WAVEFORMS
49.9kΩ
3.4kΩ
1%
1%
R1
R2
10µs/div
1N5256B
0.68µF
30V
D1
C2
0.1µF
1
5
IN
50V/div
I
5A/div
GATE
50V/div
TIMER
10V/div
OUTPUT
50V/div
SENSE
ON
TIMER
V
CC
8
0.025Ω
R
SENSE
MAX5933B
MAX5947B
GND
SENSE
4
7
10Ω
A curve of Gate Drive vs. V
GATE is clamped to a maximum voltage of 18V above the
input voltage. At a minimum input-supply voltage of 33V,
the minimum gate drive voltage is 10V. When the input
supply voltage is higher than 20V, the gate-drive voltage
is at least 10V and a standard n-channel MOSFET can be
used. Using the MAX5947 in applications over a 9V to
20V range, a logic-level N-FET must be used with a prop-
er protection Zener diode between its gate and source
(see D1 in Figure 5).
If the MAX5933_/MAX5947_ die temperature reaches
+150°C, an overtemperature fault is generated. As a
result, GATE goes low and turns the external MOSFET off.
The MAX5933_/MAX5947_ die temperature must cool
down below +130°C before the overtemperature fault
condition is removed.
5%
R5
IRF530
GATE
Q1
6
PWRGD
FB
2
3
D2
CMPZ5248B
1kΩ
5%
R6
10nF
C1
R3
59kΩ
1%
R4
3.57kΩ
1%
CC
Thermal Shutdown
R7
24kΩ
5%
is shown in
C
L
GATE Voltage
PWRGD
Figure 13.