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TPS54262MPWPTEP Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza TPS54262MPWPTEP
Descripción Electrónicos  2-A 60-V Step-Down DC-DC Converter With Low I(q) and Voltage Supervisor
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS54262MPWPTEP Datasheet(HTML) 11 Page - Texas Instruments

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TPS54262-EP
www.ti.com
SLVSDP3 – DECEMBER 2016
Product Folder Links: TPS54262-EP
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Copyright © 2016, Texas Instruments Incorporated
Feature Description (continued)
Table 1. Load Conditions
LOAD CONDITION
OUTPUT TRACKING
Nominal load in CCM
VReg tracks VIN approximately as: VReg = 95% (VIN – ILoad × 0.5)
No load/light load in LPM
To enable the tracking feature, following conditions should be met:
1) fSW < 600 kHz
2) VReg < 8 V, typical (related to VIN falling threshold when LPM is disabled)
7.3.4 Enable and Shutdown
The EN pin (pin 5) provides electrical ON/OFF control of the regulator. Once the EN pin voltage exceeds the
upper threshold voltage (VIH), the regulator starts operating and the internal soft start begins to ramp. If the EN
pin voltage is pulled below the lower threshold voltage (VIL), the regulator stops switching and the internal soft
start resets. Connecting this pin to ground or to any voltage less than VIL disables the regulator and causes the
device to shut down. This pin must have an external pullup or pulldown to change the state of the device.
7.3.5 Soft Start
An external soft-start capacitor is connected to SS pin (pin 11) to set the minimum time to reach the desired
regulated output voltage (VReg) during power-up cycle. This prevents the output voltage from overshooting when
the device is powered up. This is also useful when the load requires a controlled voltage slew rate, and also
helps to limit the current drawn from the input voltage supply line.
For proper operation, the following conditions must be satisfied during power up and after a short circuit event:
VIN – VReg > 2.5 V
Load current < 1 A, until RST goes high
The power-up current limit (30% of the typical current limit value) is released after the feedback voltage (at
VSENSE pin) is high enough such that RST is asserted high. The recommended value of soft-start capacitor is
100 nF (typical) for start-up load current of 1 A (maximum).
7.3.6 Oscillator Frequency
The oscillator frequency can be set by connecting an external resistor (R8 in Functional Block Diagram) to RT
pin (pin 6). Figure 10 shows the relation between the resistor value (RT) and switching frequency (fsw). The
switching frequency can be set in the range 200 kHz to 2200 kHz. In addition, the switching frequency can be
imposed externally by a clock signal (fext) at the SYNC pin.
7.3.6.1 Selecting the Switching Frequency
A power supply switching at a higher switching frequency allows use of lower value inductor and smaller output
capacitor compared to a power supply that switches at a lower frequency. Typically, the user will want to choose
the highest switching frequency possible because this will produce the smallest solution size. The switching
frequency that can be selected is limited by the following factors:
The input voltage
The minimum target regulated voltage
Minimum on-time of the internal switching transistor
Frequency shift limitation
Selecting lower switching frequency results in using an inductor and capacitor of a larger value, where as
selecting higher switching frequency results in higher switching and gate drive power losses. Therefore, a
tradeoff must be made between physical size of the power supply and the power dissipation at the system/
application level.


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