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參數(shù)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(shù)： | 7/22頁 |
| 文件大小： | 628K |
| 代理商： | DRV8825PWP |
P
=
R
(I
)
TOT
DS(ON)
OUT(RMS)
4
2
SLVSA73C
– APRIL 2010 – REVISED MAY 2011
THERMAL INFORMATION
Thermal Protection
The DRV8825 has thermal shutdown (TSD) as described above. If the die temperature exceeds approximately
150
°C, the device will be disabled until the temperature drops to a safe level.
Any tendency of the device to enter TSD is an indication of either excessive power dissipation, insufficient
heatsinking, or too high an ambient temperature.
Power Dissipation
Power dissipation in the DRV8825 is dominated by the power dissipated in the output FET resistance, or RDS(ON).
Average power dissipation when running a stepper motor can be roughly estimated by Equation 2.
(2)
where PTOT is the total power dissipation, RDS(ON) is the resistance of each FET, and IOUT(RMS) is the RMS output
current being applied to each winding. IOUT(RMS) is equal to the approximately 0.7x the full-scale output current
setting. The factor of 4 comes from the fact that there are two motor windings, and at any instant two FETs are
conducting winding current for each winding (one high-side and one low-side).
The maximum amount of power that can be dissipated in the device is dependent on ambient temperature and
heatsinking.
Note that RDS(ON) increases with temperature, so as the device heats, the power dissipation increases. This must
be taken into consideration when sizing the heatsink.
Heatsinking
The PowerPAD
package uses an exposed pad to remove heat from the device. For proper operation, this pad
must be thermally connected to copper on the PCB to dissipate heat. On a multi-layer PCB with a ground plane,
this can be accomplished by adding a number of vias to connect the thermal pad to the ground plane. On PCBs
without internal planes, copper area can be added on either side of the PCB to dissipate heat. If the copper area
is on the opposite side of the PCB from the device, thermal vias are used to transfer the heat between top and
bottom layers.
For details about how to design the PCB, refer to TI application report SLMA002, " PowerPAD
Thermally
Enhanced Package" and TI application brief SLMA004, " PowerPAD
Made Easy", available at www.ti.com.
In general, the more copper area that can be provided, the more power can be dissipated. It can be seen that the
heatsink effectiveness increases rapidly to about 20 cm2, then levels off somewhat for larger areas.
Copyright
2010–2011, Texas Instruments Incorporated
15
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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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