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TPS61045DRBR Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS61045DRBR Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 20 page www.ti.com td1 t(DWN) td1 t(OFF) Device Enabled Device Disabled High Low EN td1 t(UP) TPS61045 SLVS440A – JANUARY 2003 – REVISED SEPTEMBER 2003 DETAILED DESCRIPTION (continued) Table 1. Timing Table DAC OUTPUT DO TIME LOGIC LEVEL Increase one step t(UP) = 1 µs to 60 µs Low Decrease one step t(DWN) = 140 µs to 240 µs Low Shutdown t(OFF) ≥ 560 µs Low Delay between steps td1 = 1 µs High Figure 16. CTRL Timing Diagram UNDERVOLTAGE LOCKOUT An undervoltage lockout feature prevents misoperation of the device at input voltages below 1.5 V (typ). 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. THERMAL SHUTDOWN An internal thermal shutdown is implemented in the TPS61045 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. 10 |
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