1pcs/lot Reprap Stepper Driver pololu A4988 stepper motor driver module with aluminum heat sink for ramps 1.4 3D printer

1pcs lot Reprap Stepper Driver pololu A4988 stepper motor driver module with aluminum heat sink for
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1pcs lot Reprap Stepper Driver pololu A4988 stepper motor driver module with aluminum heat sink for
1pcs lot Reprap Stepper Driver pololu A4988 stepper motor driver module with aluminum heat sink for
1pcs lot Reprap Stepper Driver pololu A4988 stepper motor driver module with aluminum heat sink for
1pcs lot Reprap Stepper Driver pololu A4988 stepper motor driver module with aluminum heat sink for
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Price:  US $1.50 / piece
Sale price:  US $1.40 / piece


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A4988 driver

A4988 is a complete microstepping motor driver with built-in translator for easy operation. This product is available in full, half, 1/4, 1/8 and 1/16 step modes operate bipolar stepper motors, output drive capacity of up to 35 V and ± 2 A. A4988 includes a fixed off-time current regulator, the regulator in slow or mixed decay modes. A4988 converter is the key to the easy implementation. As long as the “step” input inputting one pulse drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. A4988 interface is very suitable for complex microprocessor is unavailable or is overburdened.
In the micro-step operation, A4988 chopping control inside automatically selects the current decay mode (Slow or Mixed). In mixed decay mode, the device is initially set to a fixed downtime in some fast decay, then the rest of the slow decay downtime. Mixed decay current control scheme results in reduced audible motor noise, increased step accuracy, and reduced power consumption. Internal synchronous rectification control circuitry is provided to improve the pulse-width modulation (PWM) operation power consumption. Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover-current protection. Special power sequencing.
A4988 surface mount QFN package (ES), a size of 5 mm × 5 mm, nominal overall package height of 0.90 mm, with an exposed pad for enhanced thermal dissipation. This package is Pb (suffix-T), with 100% matte tin leadframe plating.
Features and Benefits
· Low RDS (On) Output
· Automatic current decay mode detection / selection
· Mix with slow current decay modes
· Synchronous rectification for low power dissipation
· Internal UVLO
· Cross-current protection
· 3.3 and 5 V compatible logic supply
· Thermal shutdown circuitry
· Ground fault protection
· Load short-circuit protection
· Optional step five modes: full, 1/2, 1/4, 1/8 and 1/16

2.Heatsink

This 11x11x5mm heatsink, purchased for use with the pololu A4988 drivers, despite their tiny size they are still very large when placed on the driver, may require machining to fit on the Pololu drivers but if careful with soldering and it clears the SMD resistors I don’t see the need for any modification.

Packing list:

3pcs a4988

3pcsHeatsink

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Shipping Company Shipping Cost Estimated Delivery Time
DHL 3 - 7 days
UPS Expedited 3 - 7 days
EMS 5 - 14 days
Post Air Mail Free Shipping 15 - 45 days
Return Policy If the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.
Seller Service On-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).
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