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参数资料
| 型号： | L6238S013TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 5 A, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 10/31页 |
| 文件大小： | 3465K |
| 代理商： | L6238S013TR |
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a voltage, Vbrake, during brake mode.
The maximum capacitance specified for the Stor-
age Capacitor is 4.7
F.For applications requiring
a larger value, an external diode should be con-
nected between Vanalog and the
Storage Ca-
pacitor to prevent excessive inrush current from
damaging the charge pump circuitry. A small
value resistor (i.e. 50W) may instead be inserted
in series with the Storage Capacitor to limit the in-
rush current.
4.4 Linear Motor Current Control
The output current is controlled in a linear fashion
via a transconductance loop. Referring to Figure
4-4 the sourcing FET of one phase is forced into
full conduction by connecting the gate to Vpump,
while the sinking transistor of an appropriate
phase operates as a transconductance element.
To understand the current control loop, it will be
assumed that Q2 in figure 4-4 is enabled via SW3
by the sequencer. During a run condition, the cur-
rent in Q2 is monitored by a resistor Rs connected
to the Rsense input.
The resulting voltage that appears across Rs is
amplified by a factor of four by A3 and is sent to
A2 where it is compared to the Current Command
Signal. A2 provides sufficient drive to Q2 in order
to maintain the motor speed at the proper level as
commanded by the Speed Controller.
4.5 Transconductance Loop Stability
The RC network connected to the Compensation
pin provides for a single pole/zero compensation
scheme. The pole/zero compensation scheme.
The pole/zero locations are adjusted such that a
few dB of gain (typ. 20dB) remains in the tran-
sconductance loop at frequencies higher than the
zero.
The inductive characteristic of the load provides
the pole necessary for loop stability. Thus the
loop bandwidth is actually limited by the motor it-
self.
Figure 4-5 shows the complete transconductance
loop including compensation, plus the response.
The Bode plot depicts the normal way to achieve
stability in the loop. The pole andzero are used to
set a gain of 20dB at a higher frequency and the
pole of the motor cuts the gain to achieve stabil-
ity.
Loop instability may be caused by two factors:
1)The motor pole is too close to the zero. Refer-
ring to figure 4.6, the zero is not able to dec-
rement the shift of phase, and when the effect
of the pole is present, the phase shift may
reach 180
° and the loop will oscillate. To rec-
tify this situation, the pole/zero must be
shifted at lower frequencies by increasing the
compensation capacitor.
Figure 4-5
Figure 4-6
Figure 4-7
L6238S
18/31
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