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LM5102SD Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM5102SD Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 13 page LM5102 Waveforms Operational Notes The LM5102 offers a unique flexibility with independently programmable delay of the rising edge for both high and low side driver outputs independently. The delays are set with resistors at the RT1 and RT2 pins, and can be adjusted from 100 ns to 600 ns. This feature reduces component count, board space and cost compared to discrete solutions for adjusting driver dead time. The wide delay programming range provides the flexibility to optimize drive signal timing for a wide range of MOSFETs and applications. The RT pins are biased at 3V and current limited to 1 mA maximum programming current. The time delay generator will accommodate resistor values from 5k to 100k with turn-on delay times that are proportional to the RT resis- tance. In addition, each RT pin is monitored by a comparator that will bypass the turn-on delay if the RT pin is pulled below the timer elimination threshold (1.8V typical). Grounding the RT pins programs the LM5102 to drive both outputs with minimum turn-on delay. STARTUP AND UVLO Both top and bottom drivers include under-voltage lockout (UVLO) protection circuitry which monitors the supply volt- age (V DD) and bootstrap capacitor voltage (VHB –VHS) independently. The UVLO circuit inhibits each driver until sufficient supply voltage is available to turn-on the external MOSFETs, and the built-in hysteresis prevents chattering during supply voltage transitions. When the supply voltage is applied to V DD pin of LM5102, the top and bottom gates are 20088903 (a) 20088904 (b) FIGURE 3. Application Timing Waveforms www.national.com 8 |
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