TPS25740 Datasheet, PDF (52/64 Pages) Texas Instruments – USB Type-C and USB PD Source Controller

TPS25740, TPS25740A
SLVSDG8A – APRIL 2016 – REVISED MAY 2016
www.ti.com
System Examples (continued)
9.3.3 Dual-Port A/C Power Source (Wall Adaptor)
In this system design example, the PSEL pin is configured such that P_(SEL) = 36 W, and only 5 V and 12 V are
offered at a maximum of 3 A. The over-current protection (OCP) trip point is set just above 3 A.
The UFP pin from one TPS25740 is attached to the PCTRL pin on the other TPS25740. When one port is not
active (no UFP attached through the receptacle) its UFP pin is left high-z so the PCTRL pin on the other port is
pulled high. This allows the adaptor to provide up to the full 36 W on a single port if a single UFP is attached. If
two UFP’s are attached (one to each port) then each port only offers current that would reach a maximum of 18
W. So each port is allocated half of the overall power when each port has a UFP attached.
DC/DC
Buck
Circuit
(36W)
5V, 12V, or 20V
CSD17578Q3A (2x)
RS
10Ÿ
10Ÿ
VBUS
D+
D-
Type-C
receptacle
#1
AC/DC
Fly-Back
Circuit
24V
(36W)
DC/DC
Buck
Circuit
(36W)
5V, 12V, or 20V
VDD
CTL1
CTL2
UFP
PCTRL
TPS25740
CC1
CC2
220NŸ
100NŸ
C(AUX) C(VTX)
C(DVDD)
CSD17578Q3A (2X)
RS
10Ÿ
10Ÿ
VBUS
D+
D-
Type-C
receptacle
#2
VDD
CTL1
CTL2
UFP
PCTRL
TPS25740
CC1
CC2
220NŸ
100NŸ
C(AUX) C(VTX)
C(DVDD)
Copyright © 2016, Texas Instruments Incorporated
Figure 65. Dual-Port Adapter Provider Concept
52
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