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LM5111-2MY Datasheet(PDF) 7 Page - Texas Instruments |
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LM5111-2MY Datasheet(HTML) 7 Page - Texas Instruments |
7 / 19 page UVLO VEE IN_A VCC VCC OUT_A VEE OUT_B VEE IN_B LM5111 www.ti.com SNVS300F – JULY 2004 – REVISED MAY 2011 Block Diagram Figure 13. Block Diagram of LM5111 Detailed Operating Description LM5111 dual gate driver consists of two independent and identical driver channels with TTL compatible logic inputs and high current totem-pole outputs that source or sink current to drive MOSFET gates. The driver output consist of a compound structure with MOS and bipolar transistor operating in parallel to optimize current capability over a wide output voltage and operating temperature range. The bipolar device provides high peak current at the critical threshold region of the MOSFET VGS while the MOS devices provide rail-to-rail output swing. The totem pole output drives the MOSFET gate between the gate drive supply voltage VCC and the power ground potential at the VEE pin. The control inputs of the drivers are high impedance CMOS buffers with TTL compatible threshold voltages. The LM5111 pinout was designed for compatibility with industry standard gate drivers in single supply gate driver applications. The input stage of each driver should be driven by a signal with a short rise and fall time. Slow rising and falling input signals, although not harmful to the driver, may result in the output switching repeatedly at a high frequency. The two driver channels of the LM5111 are designed as identical cells. Transistor matching inherent to integrated circuit manufacturing ensures that the AC and DC peformance of the channels are nearly identical. Closely matched propagation delays allow the dual driver to be operated as a single with inputs and output pins connected. The drive current capability in parallel operation is precisely 2X the drive of an individual channel. Small differences in switching speed between the driver channels will produce a transient current (shoot-through) in the output stage when two output pins are connected to drive a single load. Differences in input thresholds Copyright © 2004–2011, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM5111 |
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