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TPS62171DSGR Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza TPS62171DSGR
Descripción Electrónicos  Step-Down Converters
Download  34 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62171DSGR Datasheet(HTML) 9 Page - Texas Instruments

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L
V
V
I
I
OUT
IN
HS
LIMF
typ
peak
30
×
-
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PD
L
LIMF
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9
TPS62170, TPS62171, TPS62172, TPS62173
www.ti.com
SLVSAT8D – NOVEMBER 2011 – REVISED DECEMBER 2015
Product Folder Links: TPS62170 TPS62171 TPS62172 TPS62173
Submit Documentation Feedback
Copyright © 2011–2015, Texas Instruments Incorporated
Feature Description (continued)
where
ILIMF is the static current limit, specified in Electrical Characteristics
L is the inductor value
VL is the voltage across the inductor
tPD is the internal propagation delay
(1)
space
The dynamic high-side switch peak current is calculated as follows:
space
(2)
Take care with the current limit, if the input voltage is high and very small inductances are used.
8.3.3 Power Good (PG)
The TPS6217x has a built in power good (PG) function to indicate whether the output voltage has reached its
appropriate level or not. The PG signal can be used for startup sequencing of multiple rails. The PG pin is an
open-drain output that requires a pull-up resistor (to any voltage below 7 V). It can sink 2 mA of current and
maintain its specified logic low level. It is high impedance when the device is turned off due to EN, UVLO or
thermal shutdown.
8.3.4 Undervoltage Lockout (UVLO)
If the input voltage drops, the under voltage lockout prevents misoperation of the device by switching off both the
power FETs. The under voltage lockout threshold is set typically to 2.7 V. The device is fully operational for
voltages above the UVLO threshold and turns off if the input voltage trips the threshold. The converter starts
operation again once the input voltage exceeds the threshold by a hysteresis of typically 180 mV.
8.3.5 Thermal Shutdown
The junction temperature (Tj) of the device is monitored by an internal temperature sensor. If Tj exceeds 160°C
(typical), the device goes into thermal shut down. Both the high-side and low-side power FETs are turned off and
PG goes high impedance. When Tj decreases below the hysteresis amount, the converter resumes normal
operation, beginning with soft start. To avoid unstable conditions, a hysteresis of typically 20°C is implemented
on the thermal shut down temperature.
8.4 Device Functional Modes
8.4.1 Soft Start
The internal soft start circuitry controls the output voltage slope during startup. This avoids excessive inrush
current and ensures a controlled output voltage rise time. It also prevents unwanted voltage drops from high-
impedance power sources or batteries. When EN is set to start device operation, the device starts switching after
a delay of about 50 µs and VOUT rises with a slope of about 25 mV/µs. See Figure 30 and Figure 31 for typical
startup operation.
The TPS6217x can start into a pre-biased output. During monotonic pre-biased startup, the low-side MOSFET is
not allowed to turn on until the device's internal ramp sets an output voltage above the pre-bias voltage.


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