lnk403 Power Integrations, Inc., lnk403 Datasheet - Page 2

• Manufacturer Part Number: lnk403
• Description: Led Driver Ic With Triac Dimming, Single-stage Pfc And Primary-side Constant Current Control
• Manufacturer: Power Integrations, Inc.

Pin Functional Description
DRAIN (D) Pin:
This pin is the power MOSFET drain connection. It also
provides internal operating current for both start-up and
steady-state operation.
SOURCE (S) Pin:
This pin is the power MOSFET source connection. It is also the
ground reference for the BYPASS, FEEDBACK, REFERENCE and
VOLTAGE MONITOR pins.
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.
FEEDBACK (FB) Pin:
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.
REFERENCE (R) Pin:
This pin is connected to an external precision resistor and is
used to select between dimming and non-TRIAC dimming
modes of operation.
Rev. A 080610
Figure 2.
FEEDBACK (FB)
REFERENCE (R)
2
BYPASS (BP)
MONITOR (V)
VOLTAGE
Functional Block Diagram.
LNK403-409EG
6.4 V
FEEDBACK
SENSE
SENSE
LINE
3-V
V
BG
1 V
T
UV/OV
I
CAPACITOR
LIM
BYPASS
SELECT
LOGIC
STOP
DC
FB
OFF
MAX
M
I
I
I
V
OSCILLATOR
FB
CLOCK
JITTER
REFERENCE
AUTO-RESTART
CONTROL
SOFT-START
PFC/CC
BLOCK
COUNTER
TIMER
+
-
Comparator
M
PRESENT
V
BG
I
VOLTAGE MONITOR (V) Pin:
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
undervoltage (UV), overvoltage (OV), provide feed-forward to
control the output current and the remote ON/OFF function.
FAULT
Figure 3.
DC
FB
MAX
OFF
Exposed Pad
(backside) Internally
Connected to
SOURCE Pin (see
eSIP-7C Package
Drawing)
5.9 V
5.0 V
Pin Configuration.
UNDERVOLTAGE
BYPASS PIN
+
-
OCP
REGULATOR
HYSTERETIC
SHUTDOWN
THERMAL
E Package (eSIP-7C)
5.9 V
CURRENT LIMIT
COMPARATOR
(Top View)
Driver
Gate
PI-5431-060910
SenseFet
+
-
V
LEB
SENSE
www.powerint.com
I
LIM
I
S
7 D
5 S
4 BP
3 FB
2 V
1 R
PI-5432-060710
SOURCE (S)
DRAIN (D)