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LT1162CN Datasheet(PDF) 11 Page - Linear Technology |
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LT1162CN Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LT1160/LT1162 APPLICATIONS INFORMATION + + IN TOP IN BOTTOM BOOST T GATE DR T GATE FB T SOURCE B GATE DR B GATE FB LT1160 HV VOUT RGS RSENSE 1160 F02 12V REF PWM OUT A OUT A SV+ PV+ Figure 2. Adding Synchronous Switching to a Step-Down Switching Regulator Motor Drive Applications In applications where rotation is always in the same direction, a single LT1160 controlling a half-bridge can be used to drive a DC motor. One end of the motor may be connected either to supply or to ground as seen on Figure 3. A motor in this configuration is controlled by its inputs which give three alternatives: run, free running stop (coast- ing) and fast stop (“plugging” braking, with the motor shorted by one of the MOSFETs). To drive a DC motor in both directions the LT1162 can be used to drive an H-bridge output stage. In this configura- tion the motor can be made to run clockwise, counter- clockwise, stop rapidly (“plugging” braking) or free run (coast) to a stop. A very rapid stop may be achieved by reversing the current, though this requires more careful design to stop the motor dead. In practice a closed-loop control system with tachometric feedback is usually necessary. The motor speed in these examples can be controlled by switching the drivers with pulse width modulated square waves. This approach is particularly suitable for micro- computers/DSP control loops. Figure 3. Driving a Supply Referenced Motor SV+ PV+ BOOST T GATE DR T GATE FB T SOURCE B GATE DR B GATE FB PGND LT1160 12V 1160 F03 HV + IN TOP IN BOTTOM |
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