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TPS40040DRBR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS40040DRBR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 38 page www.ti.com Enable and Start-Up Sequence Configure ILIM Threshold Soft Start 4 ms 1.5 ms VOUT ENB COMP Soft Start TPS40040, TPS40041 SLUS700D – MARCH 2006 – REVISED DECEMBER 2007 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. Copyright © 2006–2007, Texas Instruments Incorporated 11 Product Folder Link(s): TPS40040 TPS40041 |
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