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A4950 Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A4950 Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 9 page Full-Bridge DMOS PWM Motor Driver A4950 7 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Application Information Sense Pin (LSS) In order to use PWM current control, a low-value resistor is placed between the LSS pin and ground for current sensing pur- poses. To minimize ground-trace IR drops in sensing the output current level, the current sensing resistor should have an indepen- dent ground return to the star ground point. This trace should be as short as possible. For low-value sense resistors, the IR drops in the PCB can be significant, and should be taken into account. When selecting a value for the sense resistor be sure not to exceed the maximum voltage on the LSS pin of ±500 mV at maximum load. During overcurrent events, this rating may be exceeded for short durations. Ground A star ground should be located as close to the A4950 as possible. The copper ground plane directly under the exposed thermal pad of the device makes a good location for the star ground point. The exposed pad can be connected to ground for this purpose. Layout The PCB should have a thick ground plane. For optimum electrical and thermal performance, the A4950 must be soldered directly onto the board. On the underside of the A4950 package is an exposed pad, which provides a path for enhanced thermal dis- sipation. The thermal pad must be soldered directly to an exposed surface on the PCB in order to achieve optimal thermal conduc- tion. Thermal vias are used to transfer heat to other layers of the PCB. The load supply pin, VBB, should be decoupled with an electro- lytic capacitor (typically 100 μF) in parallel with a lower valued ceramic capacitor placed as close as practicable to the device. GND RS GND GND GND C1 BULK CAPACITANCE VBB OUT2 OUT1 C2 VBB 1 PAD A4950 C1 C2 OUT2 LSS OUT1 VBB IN2 IN1 VREF GND RS PCB Thermal Vias Trace (2 oz.) Signal (1 oz.) Ground (1 oz.) Thermal (2 oz.) Solder A4950 Bill of Materials Item Reference Value Units Description 1RS 0.25 (for VREF = 5 V, IOUT = 2 A) Ω 2512, 1 W, 1% or better, carbon film chip resistor 2 C1 0.22 μF X5R minimum, 50 V or greater 3 C2 100 μF Electrolytic, 50 V or greater |
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