AN2321 Freescale Semiconductor / Motorola, AN2321 Datasheet - Page 11

• Manufacturer Part Number: AN2321
• Description: Designing for Board Level Electromagnetic Compatibility
• Manufacturer: Freescale Semiconductor / Motorola

Some diode
applications
MOTOROLA
Many circuits operate with inductive loads, with high switching currents that
cause transients to be generated within the system. The diode is one of the
best device that can be used at the source of the noise as a transient voltage
suppressor. The examples below are some transient suppression techniques
using diodes.
In
transient from the coil will be coupled or radiated to other parts of the circuit.
The diode, D1, is used to clamp this voltage transient.
The diode configuration in
from the high-voltage switch.
Figure 10
schottky or zener, used to suppress the transients after the rectifier.
Designing for Board Level Electromagnetic Compatibility
Figure
Freescale Semiconductor, Inc.
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8, the control terminals will turn the coil on and off. The switching
shows the typical transformer and rectifier configuration. D2 is a
Figure 10. Transformer DC Transient Suppression
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Figure 9. DC Switch Transient Suppression
Figure 8. Relay Transient Suppression
PART 2: COMPONENT SELECTION AND CIRCUIT DESIGN TECHNIQUES
CONTROL
TERMINALS
VCC
GND
Figure 9
TXFR
D1
is used to suppress the voltage transients
D1
SWITCH
D2
D1
D2
RELAY
C
D3
AN2321/D
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