L6221AD STMicroelectronics, L6221AD Datasheet - Page 14

IC DARLINGTON SWITCH QUAD SOIC20

L6221AD

Manufacturer Part Number
L6221AD
Description
IC DARLINGTON SWITCH QUAD SOIC20
Manufacturer
STMicroelectronics
Type
Darlington Arrayr
Datasheet

Specifications of L6221AD

Voltage - Supply
4.5 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
20-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Drivers/receivers
-
Protocol
-

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Application information
6
14/22
Application information
When inductive loads are driven by the L6221, 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 (
For reliability it is suggested that the Zener is chosen so that
There are two reasons for this:
Figure 19. Free-wheeling diode connection when driving inductive loads
Care must be taken to ensure that the collectors are placed close together to avoid different
current partitioning at turn-off.
It is suggested to put in parallel channel 1 and 4 and channel 2 and 3 as shown in
for the similar electrical characteristics of the logic section (turn-on and turn-off delay time)
and the power stages (collector saturation voltage, free-wheeling diode forward voltage).
The Zener voltage changes in temperature and current.
The instantaneous power must be limited to avoid the reverse second breakdown.
V p
Figure 19
+
V z 35 V
).
Figure 20

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