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L6258 データシート(PDF) 8 Page - STMicroelectronics

部品番号 L6258
部品情報  PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6258 データシート(HTML) 8 Page - STMicroelectronics

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Charge Pump Circuit
To ensure the correct driving of the high side driv-
ers a voltage higher than Vs is supplied on the
Vboot pin. This boostrap voltage is not needed for
the low side power DMOS transistors because
their sources terminals are grounded. To produce
this voltage a charge pump method is used. It is
made by using two external capacitors; one con-
nected to the internal oscillator (CP) and the other
(Cboot) to storage the overvoltage needed for the
driving the gates of the high side DMOS. The
value suggested for the capacitors are:
Cboot
Storage
Capacitor
100
nF
CP
Pump
Capacitor
10
nF
Current Control LOOP
The current control loop is a transconductance
amplifier working in PWM mode.
The motor current is a function of the pro-
grammed DAC voltage.
To keep under control the output current, the cur-
rent control modulates the duty cycle of the two
outputs OUT_A and OUT_B, and a sensing resis-
tor Rs is connected in series with the motor wind-
ing in order to produce a voltage feedback com-
pared with the programmed voltage of the DAC .
The duty cycle modulation of the two outputs is
generated comparing the voltage at the outputs of
the error amplifier, with the two triangular wave
references .
In order to drive the output bridge with the duty
cycle modulation explained before, the signals
driving each output ( OUTA & OUTB ) are gener-
ated by the use of the two comparators having as
reference two triangular wave signals Tri_0 and
Tri_180 of the same amplitude, the same average
value (in our case Vr), but with a 180° of phase
shift each other.
The two triangular wave references are respec-
tively applied to the inverting input of the first
comparator and to the non inverting input of the
second comparator .
The other two inputs of the comparators are con-
nected together to the error amplifier output volt-
age resulting by the difference between the pro-
grammed DAC. The reset of the comparison
between the mentioned signals is shown in fig. 3.
Tri_0
Tri_180
Error Ampl.
Output
First Comp.
Output
Second Comp.
Output
Figure 3. Output comparator waveforms
L6258
8/18


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