L6258E STMicroelectronics, L6258E Datasheet - Page 16
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L6258E
Manufacturer Part Number
L6258E
Description
IC MOTOR DRIVER UNIV 36-PWRSOIC
Manufacturer
STMicroelectronics
Type
DMOS Dual Full Bridge Driverr
Datasheet
1.E-L6258E.pdf
(31 pages)
Specifications of L6258E
Applications
DC Motor Driver, Stepper Motor Driver
Number Of Outputs
2/1
Current - Output
1.2A
Voltage - Load
12 V ~ 40 V
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
PowerSO-36 Exposed Bottom Pad
Operating Supply Voltage
12 V to 40 V
Mounting Style
SMD/SMT
Operating Temperature
150 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Operating Temperature
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-1433-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L6258E
Manufacturer:
JIANGSU
Quantity:
2 522
Part Number:
L6258E
Manufacturer:
ST
Quantity:
20 000
Company:
Part Number:
L6258EX
Manufacturer:
WOLFSON
Quantity:
1 440
Part Number:
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ST
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Part Number:
L6258EXTR
Manufacturer:
ST
Quantity:
20 000
PWM current control loop
3
3.1
16/31
PWM current control loop
Open loop transfer function analysis
Block diagram: refer to
Input parameters:
●
●
●
●
●
●
●
●
●
●
●
●
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
V
where:
V
G
G
R
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.
DAC
DAC
s
in
s
V
L
R
R
R
C
Gs transconductance gain = 1/Rb
Gin transconductance gain = 1/Ra
Ampl. of the Tria_0_180 ref. = 1.6V (peak to peak)
R
R
V
, and the relation between the two variables is given by the following formula:
L
S
r
L
S
C
C
a
b
= Internal reference equal to V
= 12mH
= 12Ω
= 40KΩ
= 20KΩ
= 24V
= 0.33Ω
= to be calculated
= to be calculated
is the resistor connected in series to the output to sense the load current
is the control voltage defining the load current value
is the gain of the input transconductance amplifier ( 1/Ra )
is the gain of the sense transconductance amplifier ( 1/Rb )
Figure 5.
I
LOAD
I
LOAD
Doc ID 8688 Rev 9
I
=
LOAD
V
⋅
DAC
R S
· R
DD
/2 (Typ. 2.5V)
⋅
S
⋅
· G
-------
R b
--------------------- -
R a
1
S
R
⋅
=
= V
b
R s
V
DAC
DAC
=
· G
0.5
⋅
-------
R a
in
1
⋅
V
-------------- - A
R S
DAC
( )
L6258E