MAX5933A MAXIM [Maxim Integrated Products], MAX5933A Datasheet - Page 13

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

Figure 12. Active-Low Enable Module
Figure 13. Gate Drive vs. Supply Voltage
SHORT
GND
V
PIN
IN
Positive High-Voltage, Hot-Swap Controllers
10.2kΩ
294kΩ
16
14
12
10
8
6
4
2
0
1%
1%
R1
R2
0
______________________________________________________________________________________
0.68µF
C2
20
GATE DRIVE vs. V
0.1µF
1
5
V
CC
ON
40
TIMER
(V)
V
CC
8
CC
60
R
0.01Ω
SENSE
MAX5933A
GND
SENSE
80
4
7
10Ω
5%
R5
IRF530
GATE
Q1
6
PWRGD
FB
To achieve accurate current sensing, a Kelvin connec-
tion is recommended. The minimum trace width for 1oz
copper foil is 0.02in per amplifier to ensure the trace
stays at a reasonable temperature. However, 0.03in.
per amplifier or wider is recommended. Note that 1oz
copper exhibits a sheet resistance of approximately
530µΩ/square. Small resistances add up quickly in
high-current applications. To improve noise immunity,
connect the resistor-divider to ON close to the device,
and keep traces to V
capacitor from ON to GND also helps reject induced
noise. Figure 14 shows a layout that addresses these
issues. It is recommended that 2oz copper is used,
particularly as the external MOSFET must be thermally
coupled to the MAX5933_/MAX5947_ to ensure proper
thermal-shutdown operation.
2
3
D1
CMPZ5248B
1kΩ
5%
R6
10nF
C1
R3
143kΩ
1%
R4
4.22kΩ
1%
R7
47kΩ
5%
CC
Layout Considerations
and GND short. A 0.1µF
C
220µF
L
ON/OFF
V
V
IN-
IN+
V
V
OUT+
OUT-
V
OUT
13