Datasheet

THI 2M Series
Application Note
http://www.tracopower.com Page 21 of 25
EMC considerations
Single Output Dual Output
Recommended circuit to comply EN55022 Class A Limits
Recommended PCB Layout with Input Filter
To: comply with EN55022 CLASS A following components are needed:
Model Component Value
THI 2-05xxM
C1,C2 10µF/16V 1206 MLCC
L1 1µH SCD03021T/2.08A
THI 2-12xxM
C1,C2 10µF/16V 1206 MLCC
L1 3.9µH SCD03021T/1.2A
THI 2-24xxM
C1,C2 2.2µF/50V 1206 MLCC
L1 18µH SCD03021T/0.54A
Input Source Impedance
The power module should be connected to a low ac-impedance input source. Highly inductive source impedances
can affect the stability of the power module.
In applications where power is supplied over long lines and output loading is high, it may be necessary to use a
capacitor at the input to ensure startup.
Capacitor mounted close to the power module helps ensure stability of the unit, it is recommended to use a good
quality low Equivalent Series Resistance (ESR < 1.0Ω at 100 KHz) capacitor of a 2.2µF for the 5V input devices, a
1.0µF for the 12V input devices and a 0.47µF for the 24V input devices.
Short Circuitry Protection
Continuous, hiccup and auto-recovery mode.
During short circuit, converter still shut down, The average current during this condition will be very low and the
device will be safe in this condition.