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LNK623 Datasheet(PDF) 2 Page - Power Integrations, Inc.

Part # LNK623
Description  Energy-Efficient, Off-line Switcher with Accurate Primary-side Constant-Voltage (CV) ControlPrimary-side Constant-Voltage (CV) Control
PDF  20 Pages
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

LNK623 Datasheet(HTML) 2 Page - Power Integrations, Inc.

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Rev. K 05/21
2
LNK623-626
www.power.com
Pin Functional Description
DRAIN (D) Pin:
This pin is the power MOSFET drain connection. It provides internal
operating current for both start-up and steady-state operation.
BYPASS (BP) Pin:
This pin is the connection point for an external bypass capacitor for
the internally generated 6 V supply.
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. This pin senses the AC voltage on the bias
winding. This control input regulates the output voltage based on the
flyback voltage of the bias winding.
SOURCE (S) Pin:
This pin is internally connected to the output MOSFET source for
high-voltage power and control circuit common returns.
Figure 3
Functional Block Diagram.
Figure 4. Pin Configuration.
PI-5197-012915
SOURCE
(S)
LEADING
EDGE
BLANKING
+
-
+
-
+
-
DRAIN
(D)
BYPASS
(BP)
FEEDBACK
(FB)
SOURCE
(S)
FB
OUT
Reset
6 V
5 V
t
SAMPLE-OUT
V
ILIMIT
I
LIM
V
TH
V
ILIMIT
6.5 V
Drive
I
LIM
DC
MAX
t
SAMPLE-OUT
DC
MAX
FB
Current Limit
Comparator
STATE
MACHINE
SAMPLE
DELAY
THERMAL
SHUTDOWN
OSCILLATOR
FAULT
Auto-Restart
Open-Loop
D Q
REGULATOR
6 V
PI-5198-012315
D
S
BP
S
S
FB
P Package (DIP-8C)
D Package (SO-8C)
8
5
7
1
4
2
S
6
FB
BP
D
1
2
4
8
7
6
5
S
S
S
S



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