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UCC27424DGN Datasheet(PDF) 8 Page - Texas Instruments |
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UCC27424DGN Datasheet(HTML) 8 Page - Texas Instruments |
8 / 24 page UCC27423, UCC27424, UCC27425 SLUS545B − NOVEMBER 2002 − REVISED NOVEMBER 2004 8 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 UCC27423/4/5 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 device. [1] Two circuits are used to test the current capabilities of the UCC27423 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 UCC27423 is found to sink 4.5 A at VDD = 15 V and 4.28 A at VDD = 12 V. UDG−01065 UCC27423 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 ENBB ENBA Figure 3. |
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