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參數(shù)資料
| 型號： | E-L9935013TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO20 |
| 封裝： | ROHS COMPLIANT, POWER, MO-166, SOP-20 |
| 文件頁數(shù)： | 6/29頁 |
| 文件大?。?/td> | 311K |
| 代理商： | E-L9935013TR |
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Functional description
L9935
5.2.4
Reversing phase
Suppose the current flowed via M21, the load and M12 before reversing phase. Reversing
phase M21 and M12 will be turned off. So now the current will flow through D22, the load and
D11. This leads to a fast current decay.
5.2.5
Chopper control by oscillator
Both chopping circuits work with offset phase. One chopper will switch on the bridge at the
maximum voltage of the oscillator while the other chopper will switch on the bridge at
minimum voltage of the oscillator.
MS1 and MS2 blank switching spikes that could lead to errors of the current control circuit.
Figure 6.
Principal chopper control circuit.
SRA
SRB
OSC
COSC
MS1
MS2
Comp1
inhibit
D99AT420
+
-
Comp2
Dr1
OSCILLATOR
Dr2
RES2
RES1
R
S
MOS DRIVERS
RESET
DOMINANT
RESET
DOMINANT
RSFF1
RSFF2
fOSC=
iOSC
2.46V COSC
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