E-L6221AD STMicroelectronics, E-L6221AD Datasheet - Page 14

• Manufacturer Part Number: E-L6221AD
• Description: IC DARLINGTON SWITCH QUAD 20SOIC
• Manufacturer: STMicroelectronics
• Type: Darlington Arrayr

Specifications of E-L6221AD

• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Product: H-Bridge Drivers
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Drivers/receivers: -
• Protocol: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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