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TPS7A20 Folha de dados(PDF) 14 Page - Texas Instruments

Nome de Peças TPS7A20
Descrição Electrónicos  TPS7A20 300-mA, Ultra-Low-Noise, Low-IQ, High PSRR LDO
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
Logo TI - Texas Instruments

TPS7A20 Folha de dados(HTML) 14 Page - Texas Instruments

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C
tAt
VIN
VOUT
UVLO Rising Threshold
UVLO Hysteresis
tBt
tDt
tEt
tFt
tGt
14
TPS7A20
SBVS338A – MARCH 2020 – REVISED MARCH 2020
www.ti.com
Product Folder Links: TPS7A20
Submit Documentation Feedback
Copyright © 2020, Texas Instruments Incorporated
Application Information (continued)
Recovery from the rise results from the LDO decreasing its sourcing current in combination with the load
discharging the output capacitor (region G)
A larger output capacitance reduces the peaks during a load transient but slows down the response time of the
device. A larger DC load also reduces the peaks because the amplitude of the transition is lowered and a higher
current discharge path is provided for the output capacitor.
8.1.4 Undervoltage Lockout (UVLO) Operation
The UVLO circuit ensures that the device stays disabled before its input supply reaches the minimum operational
voltage range, and ensures that the device shuts down when the input supply collapses. Figure 5 shows the
UVLO circuit response to various input voltage events. The diagram can be separated into the following parts:
Region A: The device does not start until the input reaches the UVLO rising threshold.
Region B: Normal operation, regulating device.
Region C: Brownout event above the UVLO falling threshold (UVLO rising threshold – UVLO hysteresis). The
output may fall out of regulation but the device remains enabled.
Region D: Normal operation, regulating device.
Region E: Brownout event below the UVLO falling threshold. The device is disabled in most cases and the
output falls because of the load and active discharge circuit. The device is reenabled when the UVLO rising
threshold is reached by the input voltage and a normal start-up follows.
Region F: Normal operation followed by the input falling to the UVLO falling threshold.
Region G: The device is disabled when the input voltage falls below the UVLO falling threshold to 0 V. The
output falls because of the load and active discharge circuit.
Figure 5. Typical UVLO Operation
8.1.5 Power Dissipation (PD)
Circuit reliability demands that proper consideration be given to device power dissipation, location of the circuit
on the printed circuit board (PCB), and correct sizing of the thermal plane. The PCB area around the regulator
must be as free as possible of other heat-generating devices that cause added thermal stresses.
As a first-order approximation, power dissipation in the regulator depends on the input-to-output voltage
difference and load conditions. Use Equation 2 to approximate PD:
PD = (VIN – VOUT) × IOUT
(2)
Power dissipation can be minimized, and thus greater efficiency achieved, by proper selection of the system
voltage rails. Proper selection allows the minimum input-to-output voltage differential to be obtained. The low
dropout of the TPS7A20 allows for maximum efficiency across a wide range of output voltages.
The main heat conduction path for the device is through the thermal pad on the package. As such, the thermal
pad must be soldered to a copper pad area under the device. This pad area contains an array of plated vias that
conduct heat to any inner plane areas or to a bottom-side copper plane.


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