参数资料
| 型号： | ADM00345 |
| 厂商： | Microchip Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO 3PH BLDC CTLR MTD6505 |
| 设计资源： | ADM00345 Gerber File ADM00345 Schematic |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电机控制 |
| 嵌入式： | 是，MCU，16 位 |
| 已用 IC / 零件： | MTD6505 |
| 主要属性： | 3 相无刷 DC（BLDC）电机 |
| 次要属性： | 过压、短路和热保护 |
| 已供物品： | 板 |
| 相关产品： | MTD6505T-E/NATR-ND - IC BLDC MOTOR DVR 5V 3PH 10-UDFN MTD6505T-E/NADKR-ND - IC BLDC MOTOR DVR 5V 3PH 10-UDFN MTD6505T-E/NACT-ND - IC BLDC MOTOR DVR 5V 3PH 10-UDFN |
MTD6505
4.7
Internal Voltage Regulator
V BIAS voltage is generated internally and is used to
supply internal logical blocks. The V BIAS pin is used to
connect an external decoupling capacitor (1 μF or
higher). Notice that this pin is for IC internal use, and is
not designed to supply DC current to external blocks.
4.8
BEMF Coefficient Setting
Km is the electro-mechanical coupling coefficient of the
motor (also referred to as “motor constant” or “BEMF
constant”). Depending on the conventions in use, the
exact definition of Km and its measurement criteria can
vary among motor manufacturers. To accommodate
various motor applications, the MTD6505 provides
options to facilitate diverse BEMF coefficients.
The MTD6505 defines BEMF coefficient (Km) as the
peak value of the phase-to-phase BEMF voltage,
normalized to the electrical speed of the motor. The
following table offers methods to set the Km value for
the MTD6505 device.
TABLE 4-2:
Km SETTINGS
Km
Option
Km (mV/Hz) Range
Phase-to-Phase
Min Max
R PROG
Km0
Km1
Km2
Km3
3.25
6.5
13
26
6.5
13
26
52
GND
24 k ?
3.9 k ?
V BIAS
The R PROG sensing is actually a sequence that is con-
trolled by the firmware. For any given R PROG , the inter-
nal control block will output the corresponding Km
range.
DS22281A-page 10
? 2011 Microchip Technology Inc.
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