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L6221AD Scheda tecnica(PDF) 9 Page - STMicroelectronics

Il numero della parte L6221AD
Spiegazioni elettronici  QUAD DARLINGTON SWITCH
Download  15 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6221AD Scheda tecnica(HTML) 9 Page - STMicroelectronics

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Figure 19 : Driver for Solenoids up to 3A.
Some care must be taken to ensure that the collec-
tors are placed close together to avoid different cur-
rent partitioning at turn-off.
We suggest to put in parallel channel 1 and 4 and
channel 2 and 3 as shown in figure 19 for the similar
electrical characteristics of the logic section (turn-on
and turn-off delay time) and the power stages (col-
lector saturation voltage, free-wheeling diode for-
ward voltage).
APPLICATION INFORMATION
When inductive loads are driven by L6221A/N, a
zener diode in series with the integral free-wheeling
diodes increases the voltage across which energy
stored in the load is discharged and therefore
speeds the current decay (fig. 18).
For reliability it is suggested that the zener is chosen
so that Vp + Vz < 35 V.
The reasons for this are two fold :
1) The zener voltage changes in temperature and
current.
2) The instantaneous power must be limited to avoid
the reverse second breakdown.
Figure 18.
L6221AS - L6221AD - L6221N
9/15


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