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CR277 2PHASE DC MOTOR DRIVER
CR277
1.GeneralDescription
CR277 are integrated Hall sensors with output drivers, mainly designed for electronic commutation of brush-less DC Fan. This IC internally includes the regulator, protecting diode, Hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (DO, DOB).
While the magnetic flux density (B) is larger than operate point (Bop), DO will turn on (low), and meanwhile DOB will turn off (high). Each output is latched until B is
lower than release point(Brp), and then DO,DOBtransfer each state. For DC fan
application, sometimes need to test power reverse connection condition. Internal diode only protects chip-side but not for coil-side. If necessary, add one external diode to block the reverse current from coil-side.
2.Features
„ On-chip Hall sensor with two different sensitivity and hysteresis settings
„ 3.5V to 20Voperating voltage
„ -20℃ to 85℃ operating temperature
„ Build-in protecting diode only for chip reverse power connecting
„ 300mA (avg) output sink current
„ Low profile 4 pin SIP package
3.Applications
„ Dual-coil Brush-less DC Motor
„ Dual-coil Brush-less DC Fan
„ Revolution Counting
„ Speed Measurement
1. We appreciate your business and offer an instant 7 days return policy. (7 days after receiving the items).
2. If the items are defective, please notify us within 3 days of delivery.
3. Any items must be returned in their original condition to qualify for a refund or replacement.
4. We can ship to you by FedEx/UPS/DHL/TNT/EMS/HK Post. Please contact us directly and we will use your preferred ways.
5. We are not responsible for any accidents, delays or other issues caused by the forwarder.
6. Any import fees or charges are on the buyer's account
1. With regard to your inquiry and quotation of products, we will give you the detailed reply within 24 hours.
2.we provide warranty for all the goods from us.
3. We're in this field more than 13 years. If there's any problem, please contact with us,we'll provide suggestion from our engineer to help you solve problem.
4. We have large warehouse for goods. Keep lots of goods in warehouse, so could promise fast delivery.
5. The price of sending samples is the same. We quate FOB price. You need to bear the freight after it boarded the ship freight.
Contact us:
NAME :John Chang AND Sam Zhou
SKYPE: yzforever0313
TEL: 0086-514-87782298 87782296
FAX: 0086-514-87782297
URL:WWW.YZPST. CC / WWW.PST888.COM
ADD: Room303 Weiheng Building NO.184 Wangyue RD Yangzhou Jiangsu, China
All emails will be replied within 24 hours. Please leave a message in the Trade Manager. Thank you for ordering and hope you enjoy your purchase here. You commen ts are always welcomed and very important in our long-term business corporation.
We sincerely hope to cooperate with you.For more details, please contact me!
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