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TPS92074 Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS92074 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 24 page TPS92074 SLUSBO7 – AUGUST 2013 www.ti.com Initial Start-Up The TPS92074 is designed to achieve instant turn-on using an external linear regulator circuit. The start-up sequence is internally controlled by a VCC under-voltage lockout (UVLO) circuit. Sufficient headroom has been incorporated to support the use of an auxiliary winding with start-up linear, resistive or coupled capacitor start-up methods. VCC Bias Supply The TPS92074 can be configured to use a linear regulator with or without the use of an auxiliary winding. Using a linear regulator to provide VCC incurs more losses than an auxiliary winding, but has several advantages: • allows the use of inexpensive off-the-shelf inductors as the main magnetic • can reduce the size of the required VCC capacitor to as low as 0.1uF Another consideration when selecting a bias method involves the OVP configuration. Because the feature is enabled via the VCC pin, an auxiliary winding provides the simplest implementation of output over-voltage protection. A typical start-up sequence begins with VVCC input voltage below the UVLO threshold and the device operating in low-power, shut-down mode. The VVCC input voltage increases to the UVLO threshold of 9.8V typical. At this point all of the device features are enabled. The device loads the initial start-up value as the output reference and switching begins. The device operates until the VVCC level falls below the VCC(UVLO) falling threshold. (6.4V typical) When VVCC is below this threshold, the device enters low-power shut-down mode. Voltage Sense Operation The VSEN (voltage sense) pin is the only input to the digital controller. The time between the rising edge and the falling edge of the signal determines converter functions. The pin incorporates internal analog and digital filtering so that any transition that remains beyond the threshold for more than approximately 150 µs will cause the device to record a change-of-state. 8 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: TPS92074 |
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