LNK6418 データシートの表示（PDF） - Unspecified

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LNK6418

Energy-Efficient, Accurate Primary-Side Regulation CV/CC Switcher for Adapters and Chargers

Unspecified 

LNK64x4-64x8

BYPASS

(BP)

FEEDBACK

(FB)

6.5 V

SOURCE

(S)

+

VTH

-

tSAMPLE-OUT

CABLE DROP

COMPENSATION

+

FB

OUT

DQ

Reset

STATE

6V

5V

-

MACHINE

VILIMIT

VILIMIT

ILIM

DCMAX

Drive

INDUCTANCE

CORRECTION

FAULT

FB

AUTO-RESTART

OPEN-LOOP

t DCMAX

SAMPLE-INPUT

OSCILLATOR

THERMAL

SHUTDOWN

tSAMPLE-OUT

tSAMPLE-INPUT

REGULATOR

6V

SAMPLE

DELAY

CONSTANT

ILIM

CURRENT

VILIMIT

Current Limit

Comparator

LEADING

EDGE

BLANKING

DRAIN

(D)

SOURCE

(S)

Figure 2 Functional Block Diagram.

Pin Functional Description

DRAIN (D) Pin:

This pin is the power MOSFET drain connection. It provides

internal operating current for both start-up and steady-state

operation.

BYPASS (BP) Pin:

This pin is the connection point for an external 1 mF bypass capacitor

for the internally generated 6 V supply.

FEEDBACK (FB) Pin:

During normal operation, switching of the power MOSFET is

controlled by this pin. This pin senses the AC voltage on the

bias winding. This control input regulates both the output

voltage in CV mode and output current in CC mode based on

the flyback voltage of the bias winding. The internal induc-

tance correction circuit uses the forward voltage on the bias

winding to sense the bulk capacitor voltage.

SOURCE (S) Pin:

This pin is internally connected to the output MOSFET source

for high-voltage power and control circuit common returns.

PI-6660-020515

E Package

(eSIP-7C)

12345 7

Exposed Pad

(On Back Side)

Internally

Connected to

SOURCE Pin

D Package (SO-8C)

FB 1

8S

BP 2

7S

6S

D4

5S

Exposed Pad (On Bottom)

Internally Connected to

SOURCE Pin

FB 1

BP 2

NC 3

NC 4

D6

Figure 3. Pin Configuration.

K Package

(eSOP-12B)

12 S

11 S

10 S

9S

8S

7S

PI-6906-020515

2

Rev. C 03/16

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