LNK354PN Datasheet, PDF (2/16 Pages) Power Integrations, Inc. – lLinkSwitch-HF Family Enhanced, Energy Efficient, Low Power Off-Line Switcher IC

LNK353/354
BYPASS
(BP)
FAULT
PRESENT
AUTO-
RESTART
COUNTER
CLOCK
RESET
6.3 V
FEEDBACK
(FB)
1.65 V -V_T
JITTER
CLOCK
DC_MAX
OSCILLATOR
Figure 2. Functional Block Diagram.
REGULATOR
5.8 V
DRAIN
(D)
5.8 V
4.85 V
BYPASS PIN
UNDER-VOLTAGE
+
-
CURRENT LIMIT
COMPARATOR
VI_LIMIT
THERMAL
SHUTDOWN
SQ
RQ
LEADING
EDGE
BLANKING
SOURCE
(S)
PI-2367-021105
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.
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. MOSFET switching is terminated 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.
P Package (DIP-8B)
G Package (SMD-8B)
S1
S2
BP 3
FB 4
8S
7S
5D
Figure 3. Pin Configuration.
PI-3491-111903
2
F
2/05