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TPS54380PWP Datasheet(PDF) 11 Page - Texas Instruments |
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TPS54380PWP Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 21 page  TPS54380 SLVS454B − JANUARY 2003 − REVISED FEBRUARY 2005 www.ti.com 11 Figure 14 −60 −50 −40 −30 −20 −10 0 10 20 30 40 50 60 100 1 k 10 k 100 k 1 M −180 −150 −120 −90 −60 −30 0 30 60 90 120 150 180 f − Frequency − Hz MEASURED LOOP RESPONSE Gain Phase Figure 15 25 35 45 55 65 75 85 95 105 115 125 01 23 4 AMBIENT TEMPERATURE vs LOAD CURRENT IL − Load Current − A Safe Operating Area(1) VI = 3.3 V VI = 5 V Figure 16 Time − 1 µs/div OUTPUT RIPPLE VOLTAGE Figure 17 100 µs/div LOAD TRANSIENT RESPONSE I = 0.75 A to 2.25 A Figure 18 Vcore V I/O V I/O ~Enable START-UP TIMING 2 ms/div Figure 19 Vcore V I/O V I/O ~Enable POWER-DOWN TIMING 2 ms/div (1) Safe operating area is applicable to the test board conditions in the Dissipation Ratings table. DETAILED DESCRIPTION UNDERVOLTAGE LOCKOUT (UVLO) The TPS54380 incorporates an undervoltage lockout circuit to keep the device disabled when the input voltage (VIN) is insufficient. During power up, internal circuits are held inactive until VIN exceeds the nominal UVLO threshold voltage of 2.95 V. Once the UVLO start threshold is reached, device start-up begins. The device operates until VIN falls below the nominal UVLO stop threshold of 2.8 V. Hysteresis in the UVLO comparator, and a 2.5-µs rising and falling edge deglitch circuit reduce the likelihood of shutting the device down due to noise on VIN. TRACKIN/INTERNAL SLOW-START The internal slow-start circuit provides start-up slope control of the output voltage. The nominal internal slow-start rate is 25 V/ms. When the voltage on TRACKIN rises faster than the internal slope or is present when device operation is enabled, the output rises at the internal rate. If the reference voltage on TRACKIN rises more slowly, then the output rises at about the same rate as TRACKIN. Once the voltage on the TRACKIN pin is greater than the internal reference of 0.891 V, the multiplexer switches the noninverting node to the high-precision reference. ENABLE (ENA) The enable pin, ENA, provides a digital control enable or disable (shutdown) for the TPS54380. An input voltage of 1.4 V or greater ensures that the TPS54380 is enabled. An input of 0.82 V or less ensures that device operation is disabled. These are not standard logic thresholds, even though they are compatible with TTL outputs. When ENA is low, the oscillator, slow-start, PWM control and MOSFET drivers are disabled and held in an initial state ready for device start-up. On an ENA transition from low to high, device start-up begins with the output starting from 0 V. |
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