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参数资料
| 型号： | LB11875 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.03 A, PDSO36 |
| 封装： | 0.275 INCH, SSOP-36 |
| 文件页数： | 7/16页 |
| 文件大小： | 164K |
| 代理商： | LB11875 |
2. 13 V regulator
When a motor drive circuit is implemented from a single power supply with a voltage higher than the LB11875’s
supply voltage range, the V13 pin can be used and the LB11875’s supply voltage (13 V) can be generated. The
V13 pin circuit is a shunt regulator and a voltage of about 13 V can be generated by passing a current through an
external resistor. A stabilized voltage is generated by setting the current to a level in the range 0.5 to 4 mA. For the
external transistor, select a device that has a current capacity greater than 80 mA (ICC + Hall bias current + output
current (source)) and a breakdown voltage greater than the motor power supply voltage. Since heat generation in
this transistor may be a problem, a heat sink may be required depending on the transistor package.
3. 5 V regulator
Connect a 0.1 F or larger capacitor to stabilize the VREG voltage, which is the control circuit power supply. The
ground for that capacitor must be connected as close as possible to the IC ground.
12. Power Saving Circuit
The LB11875 goes to a power saving state that reduces the current drain in the stopped state. In the power saving
state, the bias current for most of the IC’s circuits is cut. However, the 5 V regulator output is still provided in the
power saving state.
13. Error Amplifier External Component Values
The error amplifier block external components must be located as close as possible to the IC to minimize the circuit’s
susceptibility to noise. These components must also be located as far away from the motor as possible.
14. Forward/Reverse Switching
Basically, forward/reverse switching must be performed with the motor stopped. If the direction is changed with the
motor turning, applications must provide circuits to handle the through currents that occur as the direction of rotation
changes. However, care is also required that the circuits can handle the increase in the motor supply voltage (due to
the motor current being returned to the power supply instantaneously) that occurs during direction switching. The
values of the capacitors between the power supply and ground must be increased if problems occur.
If the motor current after direction switching exceeds the current limit value, the PWM drive side will be turned off,
but the opposite side output will go to the short-circuit braking state, and a current determined by the motor induced
voltage and the coil resistance will flow. Application circuits must be designed so that this current does not exceed
the rating of the output transistors used. (This issue is more of a problem and requires greater concern the faster the
motor speed at which the motor direction is switched.)
15. Brake Switching
The braking mode can be switched between the free-running state and the short-circuit braking state with the BRSEL
pin.
The short-circuit braking technique used sets the PWM drive side output transistors for all phases to the on state. (The
transistors for the opposite side for all phases are set to the off state.) Note that the current limiter circuit does not
operate during short-circuit braking. During breaking, the duty goes to 100% (effectively, a short-circuit state),
regardless of the motor speed. The current that flows in the output transistors during braking is determined by the
motor induced voltage and the coil resistance. Application circuits must be designed so that this current does not
exceed the rating of the output transistors used. (This issue is more of a problem and requires greater concern the
faster the motor speed at which braking is applied.)
16. No Connect Pin
Since the no connect pin is electrically open, it may be used for application circuit connections.
No. 7678-15/16
LB11875
Continued from preceding page.
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