LNK520
Family
LNK500
LNK520
• Lowest cost CV/CC implementation
• Source is connected to the switching
node – simple circuit configuration & low
component count
• Very low cost CV/CC implementation
• Source connected to quiet low-side
primary return - easy layout & low noise
(low-side configuration only)
• Fast switching speeds minimize losses
for best efficiency
• Source PCB copper heatsink connected
to switching node – size should be
minimized to limit noise
• Optimized switching speed – reduces
radiated EMI by up to 5 dB (Figure 13)
• Source PCB copper heatsink connected
to primary return – area can be
maximized for higher power without noise
(low-side configuration only)
Considerations
• No bias winding required – simplest
circuit configuration
• Bias winding required – allows higher
VOR, increasing power capability (low-side
configuration only)
• Perfect for linear replacement in
applications where additional system
EMI shielding or filtering exists
• Perfect for systems where no additional
filtering or shielding exists
The LNK500 is recommended for cost
The LNK520 is recommended for both
sensitive applications in larger systems with stand-alone charger and adapter
Summary
existing EMI filtering (e.g. white goods).
applications, and larger systems where
EMI reduction is required (e.g. emergency
lighting).
Table 2. Comparison of LNK500 and LNK520.
QP: LNK500
QP: LNK520
AV: LNK520
AV: LNK500
30.0
100.0
Frequency (MHz)
200.0
Figure 13. Comparison of LNK520 and LNK500 Showing an
Approximate 5 dBµV Reduction in Radiated EMI.
E
2/05
12
POWERINT [ Power Integrations ]
