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UCC27325D Datasheet(PDF) 7 Page - Texas Instruments |
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UCC27325D Datasheet(HTML) 7 Page - Texas Instruments |
7 / 15 page UCC27323, UCC27324, UCC27325 UCC37323, UCC37324, UCC37325 SLUS492B – JUNE 2001 – REVISED SEPTEMBER 2002 7 www.ti.com APPLICATION INFORMATION source/sink capabilities during Miller plateau Large power MOSFETs present a large load to the control circuitry. Proper drive is required for efficient, reliable operation. The UCC37323/4/5 drivers have been optimized to provide maximum drive to a power MOSFET during the Miller plateau region of the switching transition. This interval occurs while the drain voltage is swinging between the voltage levels dictated by the power topology, requiring the charging/discharging of the drain-gate capacitance with current supplied or removed by the driver IC. [1] Two circuits are used to test the current capabilities of the UCC37323 driver. In each case external circuitry is added to clamp the output near 5 V while the IC is sinking or sourcing current. An input pulse of 250 ns is applied at a frequency of 1 kHz in the proper polarity for the respective test. In each test there is a transient period where the current peaked up and then settled down to a steady-state value. The noted current measurements are made at a time of 200 ns after the input pulse is applied, after the initial transient. The first circuit in Figure 2 is used to verify the current sink capability when the output of the driver is clamped around 5 V, a typical value of gate-source voltage during the Miller plateau region. The UCC37323 is found to sink 4.5 A at VDD = 15 V and 4.28 A at VDD = 12 V. UDG–01065 UCC37323 GND 1 2 3 4 INB INA 7 6 5 8 OUTA VDD OUTB INPUT 1 µF CER 100 µF AL EL DSCHOTTKY VDD C2 1 µF VSNS RSNS 0.1 Ω C3 100 µF 10 Ω + VSUPPLY 5.5 V Figure 2. |
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