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TPS40041 Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS40041
Description  LOW PIN COUNT, LOW VIN (2.5 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH ENABLE
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS40041 Fiches technique(HTML) 11 Page - Texas Instruments

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Enable and Start-Up Sequence
Configure ILIM Threshold
Soft Start
4 ms
1.5 ms
VOUT
ENB
COMP
Soft Start
TPS40040, TPS40041
SLUS700B – MARCH 2006 – REVISED MARCH 2006
APPLICATION INFORMATION (continued)
The EN pin of the TPS40040/1s internally pulled to VDD. When power is applied to VDD, the EN pin is allowed
to float high, and the TPS40040/1 remains OFF. Only when the EN pin is externally pulled below the threshold
voltage of VDD - 1.2 V is the TPS40040/1 allowed to start. When enabled, the TPS40040/1 enters a calibration
cycle where the short circuit current threshold is determined. The TPS40040/1 monitors the current out of the
COMP pin and selects a threshold based on the sensed value of the current. See Selecting the Short Circuit
Current Limit Threshold section for for details. When this calibration time is completed, the soft-start cycle is
allowed to begin. See Figure 19 below.
Figure 19. Startup
DESIGN
If the enable function is not used, the EN pin should be connected to ground
HINT:
(GND).
DESIGN
When designing the feedback loop compensation, ensure the capacitors used
HINT:
are not so large that they distort the COMP pin calibration waveform.
At the end of a calibration cycle, the TPS40040/1 slowly increases the voltage to the non-inverting input of the
error amplifier. In this way, the output voltage slowly ramps up until the voltage on the non-inverting input to the
error amplifier reaches the internal reference voltage. At that time, the voltage at the non-inverting input to the
error amplifier remains at the reference voltage.
During the soft-start interval, pulse-by-pulse current limiting is active. If seven consecutive current limit pulses are
detected, overcurrent is declared and a timeout period equivalent to seven calibration/soft-start cycles goes into
effect. See Output Short Circuit Protection section for details.
11


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