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TPS28225TDRQ1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS28225TDRQ1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 38 page TPS28225-Q1 www.ti.com SLUSAR9B – DECEMBER 2011 – REVISED APRIL 2015 8.2 Feature Description The TPS28225-Q1 features a 3-state PWM input compatible with all multi-phase controllers employing 3-state output feature. As long as the input stays within 3-state window for the 250-ns hold-off time, the driver switches both outputs low. This shutdown mode prevents a load from the reversed- output-voltage. The other features include under voltage lockout, thermal shutdown and two-way enable/power good signal. Systems without 3-state featured controllers can use enable/power good input/output to hold both outputs low during shutting down. 8.2.1 Under Voltage Lockout (UVLO) The TPS28225-Q1 incorporates an under voltage lockout circuit that keeps the driver disabled and external power FETs in an OFF state when the input supply voltage VDD is insufficient to drive external power FETs reliably. During power up, both gate drive outputs remain low until voltage VDD reaches UVLO threshold, typically 3.5 V for the TPS28225-Q1. Once the UVLO threshold is reached, the condition of gate drive outputs is defined by the input PWM and EN/PG signals. During power down the UVLO threshold is set lower, typically 3.0 V for the TPS28225-Q1. The 0.5-V hysteresis is selected to prevent the driver from turning ON and OFF while the input voltage crosses UVLO thresholds, especially with low slew rate. The TPS28225-Q1 has the ability to send a signal back to the system controller that the input supply voltage VDD is insufficient by internally pulling down the EN/PG pin. The TPS28225-Q1 releases EN/PG pin immediately after the VDD has risen above the UVLO threshold. 8.2.2 Output Active Low The output active low circuit effectively keeps the gate outputs low even if the driver is not powered up. This prevents open gate conditions on the external power FETs and accidental turn ON when the main power stage supply voltage is applied before the driver is powered up. For the simplicity, the output active low circuit is shown in a block diagram as the resistor connected between LGATE and GND pins with another one connected between UGATE and PHASE pins. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS28225-Q1 |
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