lnk501 Power Integrations, Inc., lnk501 Datasheet - Page 10

• Manufacturer Part Number: lnk501
• Description: Energy Ef?cient, Cv/cc Switcher For Very Low Cost Chargers And Adapters
• Manufacturer: Power Integrations, Inc.

3. Thermal check – At peak output power, minimum input
Figure 11. Recommended Circuit Board Layout for LinkSwitch using P Package.
10
200 ns to prevent premature termination of the on-cycle.
Verify that the leading edge current spike event is below
current limit at the end of the 200 ns blanking period.
voltage and maximum ambient temperature, verify that the
temperature specifications are not exceeded for LinkSwitch,
transformer, output diode and output capacitors. Enough
thermal margin should be allowed for part-to-part variation of
the R
low line, peak power, a maximum LinkSwitch SOURCE pin
temperature of 100 °C is recommended to allow for these
variations.
LNK501
I
2/05
DS(ON)
Capacitor
Output
of LinkSwitch as specified in the data sheet. Under
Transformer
Capacitor
Y1-
DC Out
-
+
C
S
LinkSwitch
S
S
4. Centered output characteristic – Using a transformer with
nominal primary inductance and at an input voltage midway
between low and high line, verify that the peak power point
occurs at the desired nominal output current, with the correct
output voltage. If this does not occur then the design should
be refined to ensure the overall tolerance limits are met.
Design Tools
Up to date information on design tools can be found at the
Power Integrations website: www.powerint.com.
S
D
S
Input Filter
Capacitor
PI-2900-070202
HV DC
+
-
Input