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TPS61232DRCT Datasheet(PDF) 10 Page - Texas Instruments

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No. de pieza TPS61232DRCT
Descripción Electrónicos  TPS6123x High Efficiency Synchronous Step Up Converters with 5-A Switches
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61232DRCT Datasheet(HTML) 10 Page - Texas Instruments

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EN Comparator
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TPS61230, TPS61231, TPS61232
SLVSAQ2C – JANUARY 2014 – REVISED OCTOBER 2014
www.ti.com
Feature Description (continued)
8.3.4 Undervoltage Lockout
An under voltage lockout is implemented to avoid mis-operation of the device at low input voltages. It shuts down
the device with voltages lower than VUVLO.
Use the HYS pin to configure a new undervoltage lockout threshold and hysteresis shown in Figure 10 and
Equation 3. The new thresholds must be higher than VUVLO; otherwise it does not work. The devices holds the
HYS pin low until the EN voltage rises above VEN_TH_ON. Then, the HYS pin goes high impedance.
Figure 10. EN Comparator threshold and hysteresis setting
(3)
8.3.5 Output Capacitor Discharge, TPS61231
To make sure the device starts up under defined conditions, the output capacitor of the TPS61231 gets
discharged by the VOUT pin with a typical discharge resistor of RDIS in the cases when the device gets disabled
by the EN pin, thermal shutdown, and undervoltage lockout.
8.3.6 Power Good Output
The PG output is low when the output voltage is below 90% of its nominal value. The PG pin becomes high
impedance once the output is higher than 95% of its nominal voltage. The PG pin is an open drain output and is
specified to sink up to 500 µA. This PG output requires a pull-up resistor that cannot be connected to any voltage
higher than 5.5 V. PG is held low when the device is disabled by the EN pin and thermal shutdown.
8.3.7 Over Voltage Protection
The device stops switching as soon as the output voltage exceeds VOVP. When the output voltage falls 0.15V
below the OVP threshold, the device resumes normal operation until the output voltage exceeds the OVP
threshold again.
8.3.8 Thermal Shutdown
The device goes into thermal shutdown and stops switching once the junction temperature exceeds TJSD. Once
the junction temperature falls below the threshold, it returns to normal operation automatically.
10
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Product Folder Links: TPS61230 TPS61231 TPS61232


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