Niveau: Supérieur, Doctorat, Bac+8
IN THIS ISSUE . . . The LT1158: Low Voltage, N-Channel Bridge Design Made Easy Protection from over-current faults is essential in any high current system. The LT1158 protects the top MOSFET from shorts to ground, or shorts across the motor in a full-bridge circuit. The flexibility of the LT1158 protection cir- cuitry allows the bridge designer high inrush current capability along with self protection and automatic reset in the event of a short. Life Above The Supply Rail The first problem designers face in N-channel half-bridge circuits is de- veloping the top-side gate drive, which must swing at least 10V above the supply rail for standard MOSFETs (and must remain there for dc operation). This challenge alone is so demanding that designers often resort to more expensive and less efficient P-channel by Milton Wilcox continued on page 3 Synchronous control of two N-chan- nel power MOSFETs operating from 5V to 30V has just become consider- ably easier. The new LT1158 half- bridge driver effectively deals with the many problems and pitfalls encoun- tered in the design of high efficiency motor control and switching-regula- tor circuits (see Table 1). This article will discuss these problems, along with the solutions afforded to the bridge designer by the LT1158. LT1158 Overview Figure 1 is a block diagram of the LT1158.
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