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參數資料
| 型號： | DRV8825PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁數： | 2/22頁 |
| 文件大小： | 628K |
| 代理商： | DRV8825PWP |
SLVSA73C
– APRIL 2010 – REVISED MAY 2011
The DRV8825 supports fast decay, slow decay and a mixed decay mode. Slow, fast, or mixed decay mode is
selected by the state of the DECAY pin - logic low selects slow decay, open selects mixed decay operation, and
logic high sets fast decay mode. The DECAY pin has both an internal pullup resistor of approximately 130 k
Ω
and an internal pulldown resistor of approximately 80 k
Ω. This sets the mixed decay mode if the pin is left open
or undriven.
Mixed decay mode begins as fast decay, but at a fixed period of time (75% of the PWM cycle) switches to slow
decay mode for the remainder of the fixed PWM period. This occurs only if the current through the winding is
decreasing (per the indexer step table); if the current is increasing, then slow decay is used.
Blanking Time
After the current is enabled in an H-bridge, the voltage on the xISEN pin is ignored for a fixed period of time
before enabling the current sense circuitry. This blanking time is fixed at 3.75
μs. Note that the blanking time also
sets the minimum on time of the PWM.
Microstepping Indexer
Built-in indexer logic in the DRV8825 allows a number of different stepping configurations. The MODE0 - MODE2
pins are used to configure the stepping format as shown in Table 2.
Table 2. Stepping Format
MODE2
MODE1
MODE0
STEP MODE
0
Full step (2-phase excitation) with 71% current
0
1
0
1
0
1/4 step (W1-2 phase excitation)
0
1
8 microsteps / step
1
0
16 microsteps / step
1
0
1
32 microsteps / step
1
0
32 microsteps / step
1
32 microsteps / step
Table 3 shows the relative current and step directions for different settings of MODEx. At each rising edge of the
STEP input, the indexer travels to the next state in the table. The direction is shown with the DIR pin high; if the
DIR pin is low the sequence is reversed. Positive current is defined as xOUT1 = positive with respect to xOUT2.
Note that if the step mode is changed while stepping, the indexer will advance to the next valid state for the new
MODEx setting at the rising edge of STEP.
The home state is 45
°. This state is entered at power-up or application of nRESET. This is shown in Table 3 by
the shaded cells.
Table 3. Relative Current and Step Directions
FULL
WINDING
ELECTRICAL
1/32 STEP 1/16 STEP
1/8 STEP
1/4 STEP
1/2 STEP
STEP
CURRENT
ANGLE
70%
A
B
1
100%
0%
0
2
100%
5%
3
2
100%
10%
6
4
99%
15%
8
5
3
2
98%
20%
11
6
97%
24%
14
7
4
96%
29%
17
8
94%
34%
20
9
5
3
2
92%
38%
23
10
90%
43%
25
11
6
88%
47%
28
10
Copyright
2010–2011, Texas Instruments Incorporated
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| DRV8825PWPR | 功能描述:馬達/運動/點火控制器和驅動器 2.5A Bipolar Stepper Motor Driver RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| DRV8828EVM | 功能描述:電源管理IC開發(fā)工具 DRV8828 Eval mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| DRV8828PWP | 功能描述:馬達/運動/點火控制器和驅動器 H-Bridge motor controller IC RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| DRV8828PWPR | 功能描述:馬達/運動/點火控制器和驅動器 H-Bridge motor controller IC RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| DRV8829EVM | 功能描述:電源管理IC開發(fā)工具 DRV8829 Eval mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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