LNK403-409/413-419
DRAIN (D)
5.9 V
BYPASS (BP)
REGULATOR
BYPASS
CAPACITOR
SELECT
SOFT-START
TIMER
HYSTERETIC
THERMAL
SHUTDOWN
+
-
FAULT
PRESENT
ILIM
MI
5.9 V
5.0 V
AUTO-RESTART
COUNTER
BYPASS PIN
UNDERVOLTAGE
Gate
Driver
1 V
VOLTAGE
MONITOR (V)
SenseFet
LEB
STOP
LOGIC
JITTER
CLOCK
Comparator
OSCILLATOR
-
+
FBOFF
DCMAX
3-VT
OCP
UV/OV
LINE
+
-
SENSE
CURRENT LIMIT
COMPARATOR
ILIM
IV
FEEDBACK (FB)
PFC/CC
CONTROL
VSENSE
VBG
MI
IFB
FBOFF
DCMAX
FEEDBACK
SENSE
IS
REFERENCE
BLOCK
REFERENCE (R)
VBG
6.4 V
PI-5431-102610
SOURCE (S)
Figure 3. Functional Block Diagram.
VOLTAGE MONITOR (V) Pin:
Pin Functional Description
This pin interfaces with an external input line peak detector,
consisting of a rectifier, filter capacitor and resistors. The
applied current is used to control stop logic for line under-
voltage (UV), overvoltage (OV), provide feed-forward to control
the output current and the remote ON/OFF function.
DRAIN (D) Pin:
This pin is the power FET drain connection. It also provides
internal operating current for both start-up and steady-state
operation.
SOURCE (S) Pin:
Exposed Pad
(Backside) Internally
Connected to
This pin is the power FET source connection. It is also the
ground reference for the BYPASS, FEEDBACK, REFERENCE and
VOLTAGE MONITOR pins.
SOURCE Pin
E Package (eSIP-7C)
L Package (eSIP-7F)
(Top View)
BYPASS (BP) Pin:
This is the connection point for an external bypass capacitor for
the internally generated 5.9 V supply. This pin also provides
output power selection through choice of the BYPASS pin
capacitor value.
7 D
5 S
4 BP
3 FB
2 V
1 R
3
5
1
R
FEEDBACK (FB) Pin:
Exposed Pad
(backside) Internally
Connected to
SOURCE Pin (see
eSIP-7C Package
Drawing)
FB S
The FEEDBACK pin is used for output voltage feedback. The
current into the FEEDBACK pin is directly proportional to the
output voltage. The FEEDBACK pin also includes circuitry to
protect against open load and overload output conditions.
2
4
7
D
Lead Bend Outward
from Drawing
V BP
(Refer to eSIP-7F Package
Outline Drawing)
PI-5432-082411
Figure 4. Pin Configuration.
REFERENCE (R) Pin:
This pin is connected to an external precision resistor and is
used to configure for dimming (LNK403-409) and non-TRIAC
dimming (LNK413-419) modes of operation.
2
Rev. D 08/11
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