L6221C_03 STMICROELECTRONICS [STMicroelectronics], L6221C_03 Datasheet - Page 9

• Manufacturer Part Number: L6221C_03
• Description: QUAD DARLINGTON SWITCH
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Figure 18.
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
APPLICATION INFORMATION
When inductive loads are driven by L6221C/CD, 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).
The zener has to be chosen in such a way that
V
zener’s voltage changes due to: spread on V
perature changes, and the voltage drop due to oh-
mic resistance.
Moreover, the instantaneous power must be limited
in order to avoid the reverse second breakdown.
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).
CLAMP
is limited to 60V taking into account the
L6221C
Z
, tem-
9/15