ZHCSND1A November 2020 – May 2022 DRV8434
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 規格
- 7 詳細說明
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
- RGE|24
訂購信息
7.3.6.1 Slow Decay for Increasing and Decreasing Current
Figure 7-8 Slow/Slow Decay ModeDuring slow decay, both low-side MOSFETs of the H-bridge are turned on, allowing the current to be recirculated.
Slow decay exhibits the least current ripple of the decay modes for a given tOFF. However on decreasing current steps, slow decay will take a long time to settle to the new ITRIP level because the current decreases very slowly. If the current at the end of the off time is above the ITRIP level, slow decay will be extended for multiple off time duration, until the current at the end of the cumulative off time is below the ITRIP level.
When the winding current is held static for a long time (for example while no STEP input is present), or at very low step rates, slow decay may not properly regulate the current because back-EMF will be small or absent across the motor windings. The motor current can rise rapidly, and may require an extremely long off-time. In some cases this could result in loss of current regulation. An aggressive decay mode is recommended in such cases.