TPS2061, TPS2062, TPS2063
TPS2065, TPS2066, TPS2067
www.ti.com
SLVS490B–DECEMBER 2003–REVISED DECEMBER 2004
APPLICATION INFORMATION (continued)
TUSB2040
Hub Controller
SN75240
BUSPWR
Tie to TPS2041 EN Input
Downstream
Ports
Upstream
Port
A
B
C
D
GANGED
DP1
DM1
D +
D −
DP0
DM0
D +
D −
Ferrite Beads
A
B
C
D
GND
5 V
†
GND
SN75240
DP2
DM2
TPS2041B
OC EN
IN OUT
1 µF
33 µF
5-V Power
Supply
DP3
DM3
5 V
D +
D −
A
B
C
D
Ferrite Beads
TPS76333
IN
SN75240
GND
DP4
DM4
0.1 µF
4.7 µF
V
CC
3.3 V
GND
5 V
†
4.7 µF
TPS2062
PWRON1
GND
EN1
OC1
OUT1
OUT2
33 µF
OVRCUR1
PWRON2
OVRCUR2
48-MHz
Crystal
EN2
OC2
XTAL1
XTAL2
D +
D −
IN
0.1 µF
Ferrite Beads
Tuning
Circuit
GND
5 V
†
OCSOFF
GND
33 µF
D +
D −
Ferrite Beads
GND
5 V
†
33 µF
†
USB rev 1.1 requires 120 µF per hub.
Figure 29. Hybrid Self / Bus-Powered Hub Implementation
GENERIC HOT-PLUG APPLICATIONS
In many applications it may be necessary to remove modules or pc boards while the main unit is still operating.
These are considered hot-plug applications. Such implementations require the control of current surges seen by
the main power supply and the card being inserted. The most effective way to control these surges is to limit and
slowly ramp the current and voltage being applied to the card, similar to the way in which a power supply
normally turns on. Due to the controlled rise times and fall times of the TPS206x, these devices can be used to
provide a softer start-up to devices being hot-plugged into a powered system. The UVLO feature of the TPS206x
also ensures that the switch is off after the card has been removed, and that the switch is off during the next
insertion. The UVLO feature insures a soft start with a controlled rise time for every insertion of the card or
module.
21
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