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TPS3710DSET Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS3710DSET
Description  Wide VIN Voltage Detector
Download  24 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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TPS3710DSET Fiches technique(HTML) 10 Page - Texas Instruments

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TPS3710
SBVS271 – OCTOBER 2015
www.ti.com
7.3 Feature Description
7.3.1 Input (SENSE)
The TPS3710 comparator has two inputs: one external input, and one input connected to the internal reference.
The comparator rising threshold is trimmed to be equal to the reference voltage (400 mV). The comparator also
has a built-in falling hysteresis that makes the device less sensitive to supply-rail noise and provides stable
operation.
The comparator input (SENSE) is able to swing from ground to 6.5 V, regardless of the device supply voltage.
Although not required in most cases, in order to reduce sensitivity to transients and layout parasitics for
extremely noisy applications, place a 1-nF to 10-nF bypass capacitor at the comparator input.
OUT is driven to logic low when the input SENSE voltage drops below (VIT-). When the voltage exceeds VIT+, the
output (OUT) goes to a high-impedance state; see Figure 1.
7.3.2 Output (OUT)
In a typical TPS3710 application, the output is connected to a reset or enable input of the processor (such as a
digital signal processor [DSP], central processing unit [CPU], field-programmable gate array [FPGA], or
application-specific integrated circuit [ASIC]) or the output is connected to the enable input of a voltage regulator
(such as a dc-dc converter or low-dropout regulator [LDO]).
The TPS3710 device provides an open-drain output (OUT). Use a pullup resistor to hold this line high when the
output goes to high impedance (not asserted). To connect the output to another device at the correct interface-
voltage level, connect a pullup resistor to the proper voltage rail. The TPS3710 output can be pulled up to 18 V,
independent of the device supply voltage.
Table 1 and the Input (SENSE) section describe how the output is asserted or deasserted. See Figure 1 for a
timing diagram that describes the relationship between threshold voltage and the respective output.
7.3.3 Immunity to Input-Pin Voltage Transients
The TPS3710 is relatively immune to short voltage transient spikes on the sense pin. Sensitivity to transients
depends on both transient duration and amplitude; see Figure 7, Minimum Pulse Width vs Threshold Overdrive
Voltage.
7.4 Device Functional Modes
7.4.1 Normal Operation (VDD > UVLO)
When the voltage on VDD is greater than 1.8 V for at least 150 µs, the OUT signal correspond to the voltage on
SENSE as listed in Table 1.
7.4.2 Undervoltage Lockout (V(POR) < VDD < UVLO)
When the voltage on VDD is less than the device UVLO voltage, and greater than the power-on reset voltage,
V(POR), the OUT signal is asserted regardless of the voltage on SENSE.
7.4.3
Power-On Reset (VDD < V(POR))
When the voltage on VDD is lower than the required voltage to internally pull the asserted output to GND (V(POR)),
SENSE is in a high-impedance state.
10
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