RDK-268 Power Integrations, RDK-268 Datasheet - Page 2

• Manufacturer Part Number: RDK-268
• Description: REFERENCE DESIGN LINKSWITCH-PL
• Manufacturer: Power Integrations
• Series: LinkSwitch®-PLr

Specifications of RDK-268

• Mfg Application Notes: LinkSwitch-PL Family AppNote
• Design Resources: RDR-268
• Current - Output / Channel: 366mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 2.5 V ~ 3.5 V
• Voltage - Input: 85 ~ 265VAC
• Utilized Ic / Part: LNK454DG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 596-1423

Rev. A 11/01/10
Figure 2.
Pin Functional Description
DRAIN (D) Pin:
High-voltage power MOSFET drain connection. The internal
start-up bias current is drawn from this pin through a switched
high-voltage current source. Drain current sensing and
associated controller functions are also performed using this pin.
SOURCE (S) Pin:
Power MOSFET source connection. Ground reference for
BYPASS and FEEDBACK pins.
BYPASS (BP) Pin:
Connection point for the external bypass capacitor for the
internally generated 5.85 V supply.
FEEDBACK (FB) Pin:
LED current sensing pin. During normal operation the 290 mV
threshold determines the average value of the current flowing
through the load sense resistor.
A second threshold clamps excessive output current ripple.
A third higher threshold is used to protect against output
short-circuit and overvoltage conditions (see Figure 5).
FEEDBACK (FB)
2
BYPASS (BP)
LNK454/456-458/460
Functional Block Diagram.
1 µA
I
FB
V
V
FB(SK)
FB(LO)
+
+
+
UV
V
FILTER
REF
Q
Q
I
LIM
SET
CLR
DAC
R
S
UV
4.9 V
SOA
Update
CLK
MEASUREMENT
STATE MACHINE
INTEGRATOR
FREQUENCY/
CONTROLLER
CURRENT LIMIT
DUTY CYCLE
REGULATOR
DIGITAL
PHASE
5.85 V
SOA
INC/DEC
Figure 3.
FB
BP
D
Exposed Pad Internally
Connected to SOURCE Pin
EXTENSION
1
2
4
ON-TIME
D Package (SO-8C)
Pin Configuration (Top View).
S 12
S 11
S 10
Zero Crossing
S 9
S 8
S 7
V Package (eDIP-12)
I
LIM
AUTO-RESTART
8
7
6
5
S
S
S
S
R
S
PI-5893-091010
NC 1
NC 4
NC 5
SET
CLR
BP 3
FB 2
D 6
Exposed Pad (On Bottom)
Internally Connected to
SOURCE Pin
Q
Q
+
+
K Package
(eSOP-12)
1 NC
2 FB
3 BP
4 NC
5 NC
6 D
V_I
V_Z
www.powerint.com
LIM
LIM
SOURCE (S)
DRAIN (D)
PI-5836a-092710
12 S
11 S
10 S
9 S
8 S
7 S