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参数资料
| 型号： | L6258EX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1.5 A, PDSO36 |
| 封装： | POWER, SO-36 |
| 文件页数： | 8/31页 |
| 文件大小： | 305K |
| 代理商： | L6258EX |
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L6258E
3
PWM current control loop
3.1
Open loop transfer function analysis
Block diagram: refer to Figure 5.
Input parameters:
●
VS = 24V
●
LL = 12mH
●
RL = 12Ω
●
RS = 0.33Ω
●
RC = to be calculated
●
CC = to be calculated
●
Gs transconductance gain = 1/Rb
●
Gin transconductance gain = 1/Ra
●
Ampl. of the Tria_0_180 ref. = 1.6V (peak to peak)
●
Ra = 40KΩ
●
Rb = 20KΩ
●
Vr = Internal reference equal to VDD/2 (Typ. 2.5V)
these data refer to a typical application, and will be used as an example during the analysis
of the stability of the current control loop.
The block diagram shows the schematics of the L6258E internal current control loop
working in PWM mode; the current into the load is a function of the input control voltage
VDAC , and the relation between the two variables is given by the following formula:
ILOAD RS GS = VDAC Gin
where:
VDAC
is the control voltage defining the load current value
Gin
is the gain of the input transconductance amplifier ( 1/Ra )
Gs
is the gain of the sense transconductance amplifier ( 1/Rb )
Rs
is the resistor connected in series to the output to sense the load current
In this configuration the input voltage is compared with the feedback voltage coming from
the sense resistor, then the difference between this two signals is amplified by the error
amplifier in order to have an error signal controlling the duty cycle of the output stage
keeping the load current under control.
It is clear that to have a good performance of the current control loop, the error amplifier
must have an high DC gain and a large bandwidth.
I
LOAD
R
S
1
R
b
-------
V
DAC
1
R
a
-------
=
I
LOAD
V
DAC
R
b
R
a
R
s
-------------------
0.5
V
DAC
R
S
--------------- A
()
==
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相关代理商/技术参数 |
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|---|---|
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