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TPS62742 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62742 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 page V , IN V OUT PG t softstart V IN Step Down Operation 100% Mode 100% Mode V TH_100+ V TH_100- V UVLO+ V UVLO- V TH_PG+ V PG_Hys V tracks V OUT IN V tracks V OUT IN High Low Low V discharge OUT TPS62740, TPS62742 SLVSB02B – NOVEMBER 2013 – REVISED JULY 2014 www.ti.com Feature Description (continued) 9.3.7 Undervoltage Lockout UVLO The device includes an under-voltage lockout (UVLO) comparator which prevents the device from misoperation at too low input voltages. The UVLO comparator becomes active once the device is enabled with EN set to high. Once the input voltage trips the UVLO threshold VTH_UVLO+ (typically 2.075V) for rising VIN, the UVLO comparator releases the device for start up and operation. With a falling input voltage, the device operates down to the UVLO threshold level VTH_UVLO- (typically 1.925V). Once this threshold is tripped, the device stops switching, the load switch at pin LOAD is disabled and both rails, VOUT and LOAD are discharged. The converter starts operation again once the input voltage trips the rising UVLO threshold level VTH_UVLO+. 9.4 Device Functional Modes 9.4.1 VOUT And LOAD Output Discharge Both the VOUT pin and the LOAD pin feature a discharge circuit to connect each rail to GND, once they are disabled. This feature prevents residual charge voltages on capacitors connected to these pins, which may impact proper power up of the main- and sub-system. With CTRL pin pulled to low, the discharge circuit at the LOAD pin becomes active. With the EN pin pulled to low, the discharge circuits at both pins VOUT and Load are active. The discharge circuits of both rails VOUT and LOAD are associated with the UVLO comparator as well. Both discharge circuits become active once the UVLO comparator triggers and the input voltage VIN has dropped below the UVLO comparator threshold VTH_UVLO- (typ. 1.925V). 9.4.2 Automatic Transition Into 100% Mode Once the input voltage comes close to the output voltage, the DC/DC converter stops switching and enters 100% duty cycle operation. It connects the output VOUT via the inductor and the internal high side MOSFET switch to the input VIN, once the input voltage VIN falls below the 100% mode enter threshold, VTH_100-. The DC/DC regulator is turned off, not switching and therefore it generates no output ripple voltage. Because the output is connected to the input, the output voltage tracks the input voltage minus the voltage drop across the internal high side switch and the inductor caused by the output current. Once the input voltage increases and trips the 100% mode leave threshold, VTH_100+ , the DC/DC regulator turns on and starts switching again. See Figure 6, Figure 49, Figure 50, Figure 51. Figure 6. Automatic 100% Mode Transition 10 Submit Documentation Feedback Copyright © 2013–2014, Texas Instruments Incorporated |
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