Datasheet

DP1
DM1
DP2
DM2
DP3
DM3
DP4
PWRON1
OVRCUR1
PWRON2
OVRCUR2
DM4
DP0
DM0
V
CC
XTAL1
XTAL2
OCSOFF
SN75240
D +
D −
5 V
GND
D +
D −
5 V
D +
D −
5 V
D +
D −
5 V
48-MHz
Crystal
Downstream
Ports
TUSB2040
Hub Controller
Tuning
Circuit
A
B
C
D
33 µF
†
SN75240
A
B
C
D
GND
GND
GND
33 µF
†
33 µF
†
33 µF
†
D +
D −
Upstream
Port
TPS2041B
SN75240
A
B
5 V
GND
C
D
1 µF
IN
GND
Ferrite Beads
Ferrite Beads
Ferrite Beads
Ferrite Beads
BUSPWR
GANGED
Tie to TPS2041 EN
Input
OC EN
OUT
5-V Power
Supply
IN
GND
3.3 V
4.7 µF
0.1 µF
4.7 µF
EN1
IN
OC1
OUT1
TPS2060
EN2
OC2
OUT2
0.1 µF
GND
†
USB rev 1.1 requires 120 µF per hub.
TPS76333
TPS2060, TPS2064
TPS2068, TPS2069
SLVS553K – MARCH 2005– REVISED MAY 2011 www.ti.com
Figure 24. 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.
18 Copyright © 2005–2011, Texas Instruments Incorporated