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TPS565201 Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS565201
Description  4.5-V to 17-V Input, 5-A Synchronous Step-Down Voltage Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS565201 Datasheet(HTML) 11 Page - Texas Instruments

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TPS565201
www.ti.com
SLVSE71 – SEPTEMBER 2017
Product Folder Links: TPS565201
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Copyright © 2017, Texas Instruments Incorporated
Feature Description (continued)
7.3.4 Current Protection
The output over-current limit (OCL) is implemented using a cycle-by-cycle valley detect control circuit. The
inductor current is monitored during the OFF state by measuring the low-side FET drain to source voltage, which
is proportional to the switch current. To improve accuracy, the voltage sensing is temperature compensated.
During the on time of the high-side FET switch, the switch current increases at a linear rate determined by VIN,
VOUT, and the output inductor value. During the on time of the low-side FET switch, this current decreases
linearly. The average value of the switch current is the load current IOUT. If the monitored current is above the
OCL level, the converter maintains low-side FET on and delays the creation of a new set pulse, even the voltage
feedback loop requires one, until the current level becomes OCL level or lower. In subsequent switching cycles,
the on-time is set to a fixed value and the current is monitored in the same manner.
There are some important considerations for this type of over-current protection. The load current is higher than
the over-current threshold by one half of the peak-to-peak inductor ripple current. Also, when the current is being
limited, the output voltage tends to fall as the demanded load current may be higher than the current available
from the converter. This may cause the output voltage to fall. When the VFB voltage falls below the UVP
threshold voltage, the UVP comparator detects it. And then, the device shuts down after the UVP delay time
(typically 24 µs) and re-starts after the hiccup time (typically 14.9 ms).
When the over current condition is removed, the output voltage returns to the regulated value.
7.3.5 Undervoltage Lockout (UVLO) Protection
UVLO protection monitors input voltage. When the voltage is lower than UVLO threshold voltage, the device is
shut off. This protection is non-latching.
7.3.6 Thermal Shutdown
The device monitors the temperature of itself. If the temperature exceeds the threshold value (typically 172°C),
the device is shut off. This is a non-latch protection.
7.4 Device Functional Modes
7.4.1 Normal Operation
When the input voltage is above the UVLO threshold and the EN voltage is above the enable threshold, the
TPS565201 operates in the normal switching mode. Normal continuous conduction mode (CCM) occurs when
the minimum switch current is above 0 A. In CCM, the TPS565201 operates at a quasi-fixed frequency of 500
kHz.
7.4.2 Eco-mode™ Operation
When the TPS565201 is in the normal CCM operating mode and the switch current falls to 0 A, the TPS565201
begins operating in pulse skipping eco-mode. Each switching cycle is followed by a period of energy saving sleep
time. The sleep time ends when the VFB voltage falls below the eco-mode threshold voltage. As the output
current decreases, the perceived time between switching pulses increases.
7.4.3 Standby Operation
When the TPS565201 is operating in either normal CCM or Eco-mode™, it may be placed in standby by
asserting the EN pin low.


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