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TPS62748 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62748 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 22 page V , IN V OUT t softstart V IN Step Down Operation 100% Mode 100% Mode V TH_100+ V TH_100- V UVLO+ V UVLO- V tracks V OUT IN V tracks V OUT IN V discharge OUT TPS62748 SLVSD37A – SEPTEMBER 2015 – REVISED OCTOBER 2015 www.ti.com 9.4 Device Functional Modes 9.4.1 Enable and Shutdown The device is turned on with EN=high. With EN=low the device enters shutdown and turns off the load switch. This pin must be terminated. 9.4.2 Device Start-up and Softstart The device has an internal softstart to minimize input voltage drop during start-up. This allows the operation from high impedance battery cells. Once the device is enabled the device starts switching after a typical delay time of 10ms. Then the softstart time of typical 700 µs begins with a reduced current limit of typical 150 mA. When this time passed by the device enters full current limit operation. This allows a smooth start-up and the device can start into full load current. Furthermore, larger output capacitors impact the start-up behaviour of the DC/DC converter. Especially when the output voltage does not reach its nominal value after the typical soft-start time of 700 µs, has passed. 9.4.3 Automatic Transition Into No Ripple 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, switching stops and therefore no output voltage ripple is generated. Since the output is connected to the input, the output voltage follows the input voltage minus the voltage drop across the internal high side switch and the inductor. Once the input voltage increases and trips the 100% mode exit threshold, VTH_100+ , the DC/DC regulator turns on and starts switching again. See Figure 5 and Figure 18. Figure 5. Automatic Transition into 100% Mode 10 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: TPS62748 |
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