TPS2552D Datasheet, PDF (21/31 Pages) Texas Instruments – Precision Adjustable Current-Limited Power-Distribution Switches

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TPS2552D, TPS2553D
SLVSDL7 – SEPTEMBER 2016
10.2.2 Auto-Retry Functionality
Some applications require that an overcurrent condition disables the part momentarily during a fault condition
and re-enables after a pre-set time. This auto-retry functionality can be implemented with an external resistor and
capacitor. During a fault condition, FAULT pulls low disabling the part. The part is disabled when EN is pulled
low, and FAULT goes high impedance allowing C_RETRY to begin charging. The part re-enables when the voltage
on EN reaches the turnon threshold, and the auto-retry time is determined by the resistor/capacitor time
constant. The device continues to cycle in this manner until the fault condition is removed.
Input
R_FAULT
100 kW
0.1 mF
TPS2553D
IN
OUT
Output
C_LOAD
R_LOAD
C_RETRY
0.1 mF
FAULT
EN
ILIM
GND
Power Pad
R_ILIM
20 kW
Figure 27. Auto-Retry Functionality
Some applications require auto-retry functionality and the ability to enable/disable with an external logic signal.
Figure 28 shows how an external logic signal can drive EN through R_FAULT and maintain auto-retry functionality.
The resistor/capacitor time constant determines the auto-retry time-out period.
Input
0.1 mF
TPS2553D
IN
OUT
Output
C_LOAD
R_LOAD
External Logic
Signal & Driver
R_FAULT
100 kW
C_RETRY
0.1 mF
FAULT
EN
ILIM
GND
Power Pad
R_ILIM
20 kW
Figure 28. Auto-Retry Functionality With External EN Signal
10.2.2.1 Design Requirements
For this example, use the parameters shown in Table 3.
PARAMETER
Input voltage
Output voltage
Current
Table 3. Design Requirements
VALUE
5V
5V
1200 mA
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