lnk603 Power Integrations, Inc., lnk603 Datasheet - Page 2

• Manufacturer Part Number: lnk603
• Description: Energy-efficient, Accurate Cv/cc Switcher For Adapters And Chargers
• Manufacturer: Power Integrations, Inc.

Rev. C 06/08
Figure 2
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/Multi-Functional Programmable (BP/M) Pin:
This pin has multiple functions:
1.
2.
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 both the output voltage in CV
mode and output current in CC mode based on the fl yback
voltage of the bias winding. The internal inductance correction
circuit uses the forward voltage on the bias winding to sense the
bulk capacitor voltage.
Source (S) Pin:
This pin is internally connected to the output MOSFET source for
high voltage power and control circuit common returns.
2
It is the connection point for an external bypass capacitor for
the internally generated 6 V supply.
It is a mode selection for the cable drop compensation for
LNK61X series.
FEEDBACK
SOURCE
BYPASS
LNK603-606/613-616
(BP/M)
(FB)
(S)
6.5 V
Functional Block Diagram.
COMPENSATION
V
CORRECTION
CABLE DROP
TH
INDUCTANCE
CONSTANT
CURRENT
t
SAMPLE-OUT
+
-
t
SAMPLE-INPUT
D
V
ILIMIT
FB
Q
DC
OUT
MAX
I
FB
LIM
I
LIM
DC
OSCILLATOR
Auto-Restart
MACHINE
Open-Loop
MAX
STATE
FAULT
Figure 3.
Drive
BP/M
Reset
FB
G Package (SMD-8C)
P Package (DIP-8C)
D
V
ILIMIT
SHUTDOWN
THERMAL
1
2
4
Pin Confi guration.
Current Limit
Comparator
t
SAMPLE-INPUT
t
SAMPLE-OUT
6 V
5 V
+
-
3a
V
+
-
ILIMIT
8
7
6
5
SAMPLE
BLANKING
S
S
S
S
DELAY
LEADING
EDGE
BP/M
REGULATOR
D Package (SO-8C)
FB
D
6 V
1
2
4
www.powerint.com
3b
PI-3491-012808
8
PI-4908-041508
7
6
5
SOURCE
DRAIN
S
(D)
S
S
S
(S)