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參數(shù)資料
| 型號： | L8229 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1.5 A, PDSO24 |
| 封裝： | LEAD FREE, SSO-24 |
| 文件頁數(shù)： | 7/42頁 |
| 文件大小： | 858K |
| 代理商： | L8229 |
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L8229
L6219_HI mode
6
L6219_HI mode
The device will be set into the L6219_HI mode by asserting PROG1 and PROG2 pins (pin 7
and 18) to 00.
In the L6219_HI mode, the device is pin and function compatible with the ST L6219 device.
Please note that while ST L6219 allows good power dissipation by simply connecting to gnd
the center pins because of the batwing frame, the L8229 power dissipation will be good only
by connecting the exposed pad to a proper heat sink.
The circuit is intended to drive both windings of a bipolar stepping motor. The peak current
control is made through switch mode regulation. There is a choice of three different current
levels with the two logic inputs I01 and I11 for winding 1 and I02 and I12 for winding 2. The
current can also be completely switched off.
6.1
Input Logic (I0 and I1)
The current level in the motor winding is selected with these inputs (see Figure 1). If any of
the logic inputs is left open, the circuit will treat it as a high level input.
6.2
Phase
This input pin determines the direction of current flow in the windings, depending on the
motor connections. The signal is fed through a Schmitt trigger for noise immunity, and
through a time delay in order to guarantee that no cross conduction occurs in the output
stage during phase-shift. High level on the PHASE input causes the motor current to flow
from OutA through the motor winding to OutB.
6.3
Current Sensing
This part contains a low pass filter for the external current sensing resistor (Rs) and three
comparators. Only one comparator is active at a time: it is activated by the input logic
according to the current level chosen with signals I0 and I1.
The motor current flows through the sensing resistor Rs and when the current has increased
so that the voltage across Rs becomes higher than the reference voltage on the other
comparator input, the comparator output goes high, triggering the pulse generator.
The max peak current Imax can be defined by:
Imax = Vref / 10 Rs
Table 11.
Input Logic (I0 and I1)
I0X
I1X
Current Level
H
No Current
L
H
Low Current:
1/3 Io max
H
L
Medium Current:
2/3 Io max
L
Maximum Current: Io max
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