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L6258EX bảng dữ liệu(PDF) 16 Page - STMicroelectronics

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L6258EX bảng dữ liệu(HTML) 16 Page - STMicroelectronics

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PWM current control loop
L6258EX
16/32
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 L6258EX 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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