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PBL3775N Datasheet(PDF) 8 Page - Ericsson |
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PBL3775N Datasheet(HTML) 8 Page - Ericsson |
8 / 8 page PBL 3775/1 8 Half-step mode. In the half-step mode, the current in one winding is brought to zero before a complete current reversal is made. The motor will then have taken two half steps equalling one full step in rotary movement. The cycle is repeated, but on the other phase. A total of eight states are sequenced until the initial state is reached again. Half-step mode can overcome potential resonance problems. Resonan- ces appear as a sudden loss of torque at one or more distinct stepping rates and must be avoided so as not to loose control of the motor´s shaft position. One disadvantage with the half-step mode is the reduced torque in the half step positions, in which current flows through one winding only. The torque in this position is approximately 70 % of the full step position torque. Modified half-step mode.The torque variations in half step mode will be elimi- nated if the current is increased about 1.4 times in the halfstep position. A constant torque will further reduce resonances and mechanical noise, resulting in better performance, life expectancy and reliability of the mecha- nical system. Modifying the current levels must be done by bringing the reference voltage up (or down) from its nominal value correspondingly. This can be done by using DACs or simple resistor divider networks. The PBL 3775/1 is designed to handle about 1.4 times higher current in one channel on mode, for example 2 x 500 mA in the full-step position, and 1 x 700 mA in the half-step position. Figure 14. Typical thermal resistance vs. PC Board copper area and suggested layout. Figure 15. Stepping modes. Information given in this data sheet is believed to be accurate and reliable. However no responsibility is assumed for the consequences of its use nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Ericsson Components. These products are sold only according to Ericsson Components' general conditions of sale, unless otherwise confirmed in writing. Specifications subject to change without notice. 1522-PBL 3775/1 Uen Rev. F © Ericsson Components AB 1999 Ericsson Components AB SE-164 81 Kista-Stockholm, Sweden Telephone: +46 8 757 50 00 Thermal resistance [ °C/W] PCB copper foil area [cm ] 2 80 70 60 50 40 30 20 510 15 20 30 35 25 PLCC package DIP package V R1 Dis 1 Phase 1 Phase 2 Dis 2 I MA1 I MA2 100% –100% –100% 100% Full step mode Half step mode Modified half step mode V R2 140% 100% 140% 100% 140% –140% 140% –140% Ordering Information Package Part No. DIP Tube PBL 3775/1NS PLCC Tube PBL 3775/1QNS PLCC Tape & Reel PBL 3775/1QNT SO Tube PBL 3775/1SOS SO Tape & Reel PBL 3775/1SOT 16-pin DIP 20-pin SO 28-pin PLCC |
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