LNK456VG View Datasheet(PDF) - Power Integrations, Inc

Part Name

Description

MFG CO.

LNK456VG

LED Driver IC with TRIAC Dimming, Single-Stage PFC and Constant Current Control for Non-Isolated Applications

Power Integrations, Inc 

1 2 3 4 5 6 7 8 9 10 Next

LNK454/456-458/460

BYPASS (BP)

VFB(SK)

+

UV

ILIM

Q SET S

Q CLR R

4.9 V

SOA

UV

REGULATOR

5.85 V

CURRENT LIMIT

SOA

STATE MACHINE

DRAIN (D)

ILIM

+

V_ILIM

VFB(LO)

+

IFB

1 µA

FEEDBACK (FB)

VREF DAC

PHASE

MEASUREMENT

Zero Crossing

+

V_ZLIM

+

FILTER

DIGITAL

INTEGRATOR

Update

CLK

INC/DEC

FREQUENCY/

DUTY CYCLE

CONTROLLER

AUTO-RESTART

S SET Q

R CLR Q

ON-TIME

EXTENSION

PI-5893-091010

SOURCE (S)

Figure 2. Functional Block Diagram.

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).

D Package (SO-8C)

FB 1

8

S

2

BP

7

S

6

S

4

5

D

S

Exposed Pad Internally

Connected to SOURCE Pin

Exposed Pad (On Bottom)

Internally Connected to

SOURCE Pin

K Package

(eSOP-12)

NC 1

12 S

FB 2

11 S

BP 3

10 S

NC 4

9S

NC 5

8S

D6

7S

V Package (eDIP-12)

S 12

S 11

S 10

S9

S8

S7

1 NC

2 FB

3 BP

4 NC

5 NC

6D

PI-5836a-092710

Figure 3. Pin Configuration (Top View).

2

Rev. A 11/01/10

www.powerint.com

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