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参数资料
| 型号： | LB1955 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1 A, PDSO28 |
| 封装： | HSOP-28 |
| 文件页数： | 6/9页 |
| 文件大小： | 131K |
| 代理商： | LB1955 |
VG and LIM Pin Usage
No. 5452-6/9
LB1955
LIM pin: Open
VG – Rf: Shorted
Gm = 0.423/Rf (A/V)
(Closed loop control gain)
Ilim = (VREF × 27/200 – 0.2) × 4.23/3/Rf
(Current limit)
VG pin: Open
Gm = 1/Rf (A/V)
(Closed loop control gain)
Ilim = (VREF ×27/200 – 0.2) ×10/3/Rf
(Current limit)
LIM – VREF: Shorted
No current limit.
Note: This current limiting function is for protection against unusual and abnormal currents. If a current limit level below the rated current is set, this will,
inversely, result in heat generation within the IC.
When the LIM pin is open, VG is shorted to Rf, and Rf = 0.47
, this will result in a current limit level of about 1.3 to 1.4 A. If this limit falls under the
rated value due to mode changes or changes in the value of the Rf resistor, set the current limit to an appropriate value by applying to the LIM pin a
voltage that is divided from the VREF to ground potential by resistors of a few k. Alternatively, short the LIM pin to VREF to defeat the current limit
function.
Output
stage
PG and FG Pin Output Circuits
FG (FGR shorted to ground)
PG (FGR shorted to PG)
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