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TPS61045DRBRG4 Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS61045DRBRG4 Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 26 page td1 t(DWN) td1 t(OFF) Device Enabled Device Disabled High Low EN td1 t(UP) TPS61045 SLVS440C – JANUARY 2003 – REVISED DECEMBER 2014 www.ti.com Figure 11. CTRL Timing Diagram 7.3.6 UVLO An UVLO feature prevents misoperation of the device at input voltages below 1.5 V (typical). As long as the input voltage is below the undervoltage threshold, the device remains off, with the input switch (Q1) and the main switch (Q2) open. 7.3.7 Thermal Shutdown An internal thermal shutdown is implemented in the TPS61045 device that shuts down the device if the typical junction temperature of 160°C is exceeded. If the device is in thermal shutdown mode, the input switch (Q1) and the main switch (Q2) are open. 7.4 Device Functional Modes The device operates in a pulse frequency modulation (PFM) scheme with constant peak current control. This control scheme maintains high efficiency over the entire load current range, and with a switching frequency of up to 1 MHz, the device enables the use of small external components. The converter monitors the output voltage. When the feedback voltage falls below the reference voltage of 1.233 V (typical), the main switch turns on and the current ramps up. The main switch turns off when the inductor current reaches the internally set peak current of 375 mA (typical). 10 Submit Documentation Feedback Copyright © 2003–2014, Texas Instruments Incorporated Product Folder Links: TPS61045 |
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