Datasheet

LNK362-364
C
12/05
2
PI-4232-110205
CLOCK
JITTER
OSCILLATOR
5.8 V
4.8 V
SOURCE
(S)
S
R
Q
DC
MAX
BYPASS
(BP)
FAULT
PRESENT
+
-
V
I
LIMIT
LEADING
EDGE
BLANKING
THERMAL
SHUTDOWN
+
-
DRAIN
(D)
REGULATOR
5.8 V
BYPASS PIN
UNDER-VOLTAGE
CURRENT LIMIT
COMPARATOR
FEEDBACK
(FB)
Q
6.3 V
RESET
AUTO-
RESTART
COUNTER
V
FB
-V
TH
CLOCK
Figure 3. Pin Confi guration.
Pin Functional Description
DRAIN (D) Pin:
Power MOSFET drain connection. Provides internal operating
current for both start-up and steady-state operation.
BYPASS (BP) Pin:
Connection point for a 0.1 µF external bypass capacitor for the
internally generated 5.8 V supply. If an external bias winding is
used, the current into the BP pin must not exceed 1 mA.
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. MOSFET switching is disabled when a
current greater than 49 µA is delivered into this pin.
SOURCE (S) Pin:
This pin is the power MOSFET source connection. It is also the
ground reference for the BYPASS and FEEDBACK pins.
PI-3491-111903
FB
D
S
BP
S
S
S
P Package (DIP-8B)
G Package (SMD-8B)
8
5
7
1
4
2
3
Figure 2. Functional Block Diagram.