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ML4426IS 数据表(PDF) 1 Page - Micro Linear Corporation |
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ML4426IS 数据表(HTML) 1 Page - Micro Linear Corporation |
1 / 16 page CAT 17 FB A 22 FB B 23 FB C 24 BACK EMF SAMPLER CRT 19 – + – + 1.5V 750nA – + 1.5V 750nA VDD VDD CRR 21 500nA VDD SPEED FB 20 CVCO 15 16 RVCO VOLTAGE CONTROLLED OSCILLATOR VCO/TACH 13 2 4 3 9 10 HA HB HC LA LB GATING LOGIC & OUTPUT DRIVERS + – SPEED SET 8 5 SPEED COMP 3.9V 1.7V 20kHz 6 CT – + 1.4V 1 ISENSE × 5 UVLO 12 F/R – + 1.7V VREF 26 CIOS 16k Ω 8k Ω ILIMIT 1-SHOT 25 BRAKE VDD 4k Ω 14 VDD 28 GND 27 RREF 11 LC REFERENCE VCO OUT VCO OUT 18 UV FAULT 7 VREF A B C D E F R COMMUTATION STATE MACHINE July 2000 ML4426* Bi-directional Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML4426 PWM motor controller provides all of the functions necessary for starting and controlling the speed of delta or wye wound Brushless DC (BLDC) motors without Hall Effect sensors. Back EMF voltage is sensed from the motor windings to determine the proper commutation phase sequence using a PLL. This patented sensing technique will commutate a wide range of 3- Phase BLDC motors and is insensitive to PWM noise and motor snubbing circuitry. The ML4426 limits the motor current using a constant off- time PWM control loop. The velocity loop is controlled with an onboard amplifier. The ML4426 has circuitry to ensure that there is no shoot-through in directly driven external power MOSFETs. The timing of the start-up sequence is determined by the selection of three timing capacitors. This allows optimization for a wide range of motors and loads. FEATURES s Motor starts and stops with power to IC s Bi-directional motor drive for applications requiring forward/ reverse operation s On-board start sequence: Align ® Ramp ® Set Speed s Patented Back-EMF commutation technique provides jitterless torque for minimum “spin-up” time s Onboard speed control loop s PLL used for commutation provides noise immunity from PWM spikes, compared to noise sensitive zero crossing technique s PWM control for maximum efficiency s Direct FET drive for 12V motors; drives high voltage motors with IC buffers from IR, IXYS, Harris, Power Integrations, Siliconix, etc. (* Indicates Part Is End Of Life As Of July 1, 2000) BLOCK DIAGRAM (Pin Configuration Shown for 28 Pin Version) 1 |
类似零件编号 - ML4426IS |
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类似说明 - ML4426IS |
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