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TPS254900A-Q1 Datasheet(PDF) 21 Page - Texas Instruments

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Part No. TPS254900A-Q1
Description  Automotive USB Host Charger With Short-to-VBATT Protection
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS254900A-Q1 Datasheet(HTML) 21 Page - Texas Instruments

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IN
OUT
DP_IN
DM_IN
ILIM_LO
ILIM_HI
GND
CTL1
CTL2
EN
TPS254900A-Q1 Port 1
100 kW
100 kW
EN1
FAULT1
USB Charging
Port 1
5 V
FAULT
STATUS
IN
OUT
DP_IN
DM_IN
ILIM_LO
ILIM_HI
GND
CTL1
CTL2
EN
TPS254900A-Q1 Port 1
EN2
FAULT2
USB Charging
Port 1
FAULT
STATUS
Copyright © 2017, Texas Instruments Incorporated
21
TPS254900A-Q1
www.ti.com
SLUSCU5A – NOVEMBER 2017 – REVISED JANUARY 2018
Product Folder Links: TPS254900A-Q1
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Copyright © 2017–2018, Texas Instruments Incorporated
8.3.6.3 Implementing PPM in a System With Two Charging Ports (CDP and SDP1)
Figure 39 shows the implementation of the two charging ports with data communication, each with a
TPS254900A-Q1 device and configured in CDP mode. In this example, the 5-V power supply for the two
charging ports is rated at less than 3.5 A. Both TPS254900A-Q1 devices have R(ILIM) chosen to correspond to
the low (1-A) and high (2.4-A) current-limit setting for the port. In this implementation, the system can support
only one of the two ports at 2.4-A charging current, whereas the other port is set to the SDP1 mode and IOS
corresponds to 1 A.
Figure 39. PPM Between CDP and SDP1
8.3.7 Overcurrent Protection
When an overcurrent condition is detected, the device maintains a constant output current and reduces the
output voltage accordingly. Two possible overload conditions can occur. In the first condition, the output is
shorted before the device is enabled or before the application of V(IN). The TPS254900A-Q1 device senses the
short and immediately switches into a constant-current output. In the second condition, a short or an overload
occurs while the device is enabled. At the instant the overload occurs, high currents flow for 1 to 2 μs (typical)
before the current-limit circuit reacts. The device operates in constant-current mode after the current-limit circuit
has responded. Complete shutdown occurs only if the fault is present long enough to activate thermal limiting.
The device remains off until the junction temperature cools approximately 20°C and then restarts. The device
continues to cycle on and off until the overcurrent condition is removed.


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