lnk354 Power Integrations, Inc., lnk354 Datasheet - Page 2

• Manufacturer Part Number: lnk354
• Description: Enhanced, Energy Ef?cient, Low Power Off-line Switcher Ic
• Manufacturer: Power Integrations, Inc.

Figure 2. Functional Block Diagram.
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.
2
FEEDBACK
LNK353/354
BYPASS
(FB)
(BP)
F
2/05
1.65 V -V
T
6.3 V
OSCILLATOR
JITTER
COUNTER
RESTART
CLOCK
AUTO-
DC
CLOCK
RESET
MAX
PRESENT
FAULT
4.85 V
5.8 V
Figure 3. Pin Configuration.
SHUTDOWN
THERMAL
+
-
S
R
BYPASS PIN
UNDER-VOLTAGE
Q
Q
BP
FB
G Package (SMD-8B)
P Package (DIP-8B)
S
S
REGULATOR
1
2
3
4
5.8 V
CURRENT LIMIT
COMPARATOR
BLANKING
LEADING
EDGE
8
7
5
+
-
S
D
S
V I
LIMIT
PI-2367-021105
PI-3491-111903
SOURCE
DRAIN
(D)
(S)