max5042atnt Maxim Integrated Products, Inc., max5042atnt Datasheet - Page 19

• Manufacturer Part Number: max5042atnt
• Description: Two-switch Power Ics With Integrated Power Mosfets And Hot-swap Controller
• Manufacturer: Maxim Integrated Products, Inc.

Calculate the hot-swap inrush current using the follow-
ing formula:
where:
C
S
given in the Electrical Characteristics table.
For example, assuming an input bulk capacitance of
100µF, and using the typical value of 10V/ms for the
slew rate, the calculated inrush current is 1A. See Table
1 for suggested external hot-swap MOSFETs.
Figure 7. MAX5042 Typical Application Circuit (48V Power Supply with Hot-Swap Capability)
HSLR
IN
= the load capacitance,
32V TO 72V
220µF
100V
NEGIN
C30
0.68µF
100V
V
C1
IN+
is the MAX5042 hot-swap slew rate magnitude
I
C
C20
0.1µF
100V
IN
R12
200kΩ
1%
C9
220pF
=
Determining Hot-Swap Inrush Current
0.1µF
C12
C3
1µF
C
Power MOSFETs and Hot-Swap Controller
______________________________________________________________________________________
IN
dV
10kΩ
R13
1MΩ
R14
HSDRAIN
Two-Switch Power ICs with Integrated
dt
C25
0.22µF
10kΩ
R20
=
10kΩ
R22
C S
24.9kΩ
C13
1µF
R15
1%
IN HSLR
RAMP
RCFF
REG9
DRVIN
FLTINT
DRVDEL
SYNC
PWMSD
REG5
RCOSC
POSINPWM
C14
100pF
HSEN
CSS
C11
0.1µF
DRNH
NEGIN HSGATE
UVLO
MAX5042
U1
HSDRAIN
N1
(HOT-SWAP MOSFET)
PWMNEG,
1.24kΩ
CSN PWMPNEG OPTO
R21
1%
Table 1. MAX5042 Suggested External
Hot-Swap MOSFETs
MAXIMUM I
CSP, SRC
XFRMRH
XFRMRL
REG15
BST
33mΩ
0.25
R10
1%
0.5
1
2
3
4
Typical Application Circuits
LOAD
C6
0.1µF
C7
1µF
15Ω
R9
(A)
R6
200Ω
1%
C8
0.33µF
D4
D1
D2
SUGGESTED EXTERNAL MOSFET
T1
E
C
R11
20Ω
1%
C16
0.001µF
C5
0.0047µF
D3
0.15µF
FOD2712
C19
U2
COMP
4.4µH
IRF1310NS
IRF1310NS
GND
L1
LED
150µF
IRF540NS
IRFR3910
FB
IRFL4310
6.3V
IRFL110
C17
0.1µF
C15
R3
150Ω
1%
150µF
6.3V
C18
10Ω
R4
R1
25.5kΩ
1%
R2
8.25kΩ
1%
10Ω
1%
R5
C4
0.1µF
SGND
5V
8A
19