AM2168 데이터 시트보기 (PDF) - Unspecified

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AM2168

Dual Full-Bridge PWM Motor Driver

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AM2168

Motor Driver ICs

•General

The PHASE input to each bridge determines the direction of current flow in the motor winding. An internally

generated deadtime (approximately 2µs) prevents crossover currents that can occur when switching the PHASE

input. All four drivers in the bridge output can be turned OFF between steps (I0 = I1 ≧ 2.4V) resulting in a fast

current decay through the internal output clamp and flyback diodes. The fast current decay is desirable in half-step

and high-speed applications. All inputs float high.

Varying the reference voltage (VREF) provides continuous control of the peak load current for microstepping

applications and DC motor control.

Thermal protection circuitry turns OFF all drivers when the junction temperature reaches +170℃. It is only intended

to protect the device from failures due to excessive junction temperature and should not imply that output short

circuits are permitted. The output drivers are re-enabled when the junction temperature cools to +145℃.

The AM2168 output drivers are optimized for low output saturation voltages – less than 1.8V total (source plus sink)

at 500mA. Under normal operating conditions, when combined with the excellent thermal properties of the batwing

packing design, this allows continuous operation of both bridges simultaneously at 500mA.

AMtek semiconductors

-7-

Dec. 2004 V1.2

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