EDE1204 데이터 시트보기 (PDF) - Unspecified
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EDE1204 Datasheet PDF : 7 Pages
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Connection via Eight-NPN Transistor H-Bridge (full EDE1204 schematic not shown)
The above circuit utilizes eight NPN transistors. For low-current applications, inexpensive 2N2222
NPN transistors may be used. For higher currents, higher-capacity transistors may be used. One
suitable choice would be ZETEX ZTX690B (high-gain NPN), capable of up to 2A continuous
current. (ZETEX Semiconductor's web site iswww.zetex.com ) If a typical, low-gain power
transistor is used, such as the MJE3055T, you may need to modify resistor values due to these
transistors' lower current gain. Notice that the four diodes connecting the emitters to the collectors
must be capable of carrying the motor coil current, and that the eight clamping diodes must be fast
enough for the maximum motor speed to be used. In most instances, a 1N4007 or 1N5408 works
well for the four emitter-collector diodes, and a 1N4007 works well for the eight clamping diodes.
One advantage of using all NPN transistors for the drive circuitry is that it lowers the possibility of
confusion during board assembly & production. Also, using only eight transistors, it results in a
lower production cost than most typical H-Bridge circuits.
© COPYRIGHT 1998 E-LAB Digital Engineering, Inc. All rights reserved. Page 5
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