Rev. F 05/18

3

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Pin Functional Description

VOLTAGE SUPPLY (VCC) Pin:

During Run mode, power derived from the transformer voltage

supply winding is fed to the control circuitry via the VOLTAGE

SUPPLY pin.

BASE DRIVE (BD) Pin:

BASE DRIVE pin for BJT.

EMITTER DRIVE (ED) Pin:

EMITTER DRIVE pin for BJT.

FEEDBACK (FB) Pin:

The FEEDBACK pin input provides feedback to the control

circuitry by monitoring the transformer voltage waveform.

GROUND (GND) Pin:

Power and signal ground.

Primary CURRENT SENSE (CS) Pin:

Primary CURRENT SENSE pin via R

CS.

SUPPLEMENTARY BASE DRIVE (SBD) Pin:

Supplementary base drive.

Figure 5.

LNK40x3D, LNK4323D, LNK40x4D, LNK4114D, LNK4115D and LNK4215D Functional Block Diagram.

Figure 6. Pin Configuration.

PI-7465-033015

VOLTAGE SUPPLY

(VCC)

BASE DRIVE

(BD)

EMITTER DRIVE

(ED)

GROUND

(GND)

CURRENT

SENSE

(CS)

FEEDBACK

(FB)

Reset

Signal

SWITCH

VDD(REG)

VVCC(RUN)

VVCC(SLEEP)

VDD

IFBHT(LO)

VIN

UVP

VOUT

OVP

IFBHT(START)

VOVP

VCSTHR

CS

OCP

VCMAX

CYCLE

TIMING

VHT ESTIMATOR

RESET CIRCUIT

VDD REGULATOR

CABLE

COMPENSATION

CC CURRENT

CONTROL

CS BLANKING

CV VOLTAGE

CONTROL

PFM/PWM

THERMAL

SHUTDOWN

SUPPLEMENTARY

BASE DRIVE

(SBD)

PI-7673-061516

D Package (SO-8)

(LNK40x4D, LNK4114D, LNK4214D,

LNK4115D, LNK4215D)

S Package (SOT-23-6)

CS

VCC

BD

SBD

8

7

6

5

1

2

3

4

FB

FB

GND

ED

CS

VCC

BD

6

1

5

2

4

3

GND

GND

ED

D Package (SO-8)

(LNK40x3D, LNK4323D)

CS

VCC

SBD

BD

8

7

6

5

1

2

3

4

FB

GND

GND

ED