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LNK623 Datasheet(PDF) 6 Page - Power Integrations, Inc.

Part # LNK623
Description  Energy-Effi cient, Off-line Switcher with Accurate Primary-side Constant-Voltage (CV) Control
PDF  18 Pages
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

LNK623 Datasheet(HTML) 6 Page - Power Integrations, Inc.

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Rev. E 09/09
6
LNK623-626
www.powerint.com
Figure 5.
PCB Layout Example.
Figure 6.
Schematic Representation of Recommended Layout Without
External Bias.
Figure 7.
Schematic Representation of Recommended Layout With
External Bias.
+
-
AC
IN
PI-5269-122408
Y1-
Capacitor
(optional)
Isolation Barrier
Transformer
T1
Output
Rectifiers
Primary Side
Secondary Side
R1
JP1
J1
C1
R3
R4
C12
R10
D9
C11
C13
D7
C9
R9
R8
D8
16
R7
C8
L3
C10
C2
R2
C3
D1
D3
D5
VR1
D6
C6
R6
R5
C5
C4
D4
RV1
F1
D2
RT1
L2
L1
J2
Input Filter
Capacitor
Drain trace area
miniminzed
Clamp
Components
Copper area
maximized for
heatsinking
DC Outputs
ESD
spark gap
Bypass
Capacitor
close to device
Feedback
Resistors close
to device
10 mil
gap
U1
S
FB
BP
D
S
S
S
Output Filter
Capacitor
PI-5265-110308
Kelvin connection at
Source pin, no power
currents in signal traces
Minimize FB
pin node
area
CLAMP
D
S
FB
BP
B+
PRI RTN
Bias currents
return to bulk
capacitor
PI-5266-110308
Kelvin connection at
Source pin, no power
currents in signal traces
Bias currents
return to bulk
capacitor
Small FB
pin node
area
Bias resistor
CLAMP
D
S
FB
BP
PRI RTN
B+



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