11
TDK-Lambda
PFE300SA
･
500SA Series
INSTRUCTION MANUAL
6-8. Power ON Signal (ENA Terminal)
This signal is located at the secondary side (output side) and is an open drain output.
Maximum sink current : 10mA
Maximum applied voltage : 75V.
Return line for ENA terminal is the -V terminal.
When output voltage goes over a specified voltage level at start up, Power ON signal is “Low level”. Output
voltage threshold level is as follows.
Table 6-2
Output voltage in case an ENA signal changes
6-9. Maximum Ripple and Noise
This value is measured according to the description below in accordance with JEITA RC-9131B.
In the basic connection shown in Fig. 5-1, additional connection shown in Fig. 6-4 is done for measurement.
Capacitor (Ceramic Capacitor : 2.2µF and Electrolytic Capacitor : Refer to Table 5-2) must be connected
within 50mm from the output terminals. Then, connect coaxial cable with JEITA attachment across the
ceramic capacitor electrodes. Use 100MHz bandwidth oscilloscope or equivalent.
Also, note that output ripple voltage and output spike noise may vary depending on the wiring pattern of the
printed circuit board.
In general, output ripple voltage and output spike noise can be reduced by increasing external capacitor value.
Fig.6-4 Output Ripple Voltage (including Spike Noise)
Measurement Method
