lnk623 Power Integrations, Inc., lnk623 Datasheet - Page 6

• Manufacturer Part Number: lnk623
• Description: Energy-efficient, Off-line Switcher With Accurate Primary-side Constant-voltage Cv Control
• Manufacturer: Power Integrations, Inc.

Rev. C 12/08
Figure 5.
Figure 6.
maximized for
Copper area
heatsinking
6
Bias currents
return to bulk
capacitor
Input Filter
Capacitor
PCB Layout Example.
Schematic Representation of Recommended Layout Without
External Bias.
PRI RTN
LNK623-626
B+
J1
F1
D2
currents in signal traces
Source pin, no power
Kelvin connection at
D1
+
AC
IN
C1
D3
-
Primary Side
L1
CLAMP
10 mil
gap
RV1
L2
RT1
Minimize FB
D4
pin node
C2
area
C4
close to device
PI-5265-110308
S
S
S
S
C5
Capacitor
Bypass
U1
Components
VR1
R1
R5
Clamp
FB
R2
BP
R6
Drain trace area
D
miniminzed
D5
C3
R4
R3
C6
Resistors close
Feedback
to device
D6
T1
Isolation Barrier
Figure 7.
Capacitor
(optional)
Bias currents
return to bulk
capacitor
Y1-
Transformer
spark gap
Schematic Representation of Recommended Layout With
External Bias.
ESD
PRI RTN
C12
B+
currents in signal traces
Source pin, no power
Kelvin connection at
Secondary Side
D9
J2
1
D8
Rectifiers
Output
DC Outputs
R10
JP1
R8
CLAMP
C9
Small FB
pin node
area
C8
Bias resistor
R7
D7
C11
R9
PI-5266-110308
Output Filter
6
Capacitor
L3
C10
www.powerint.com
C13
PI-5269-122408