LNK501P datasheet(2/20 Pages) POWERINT

Il numero della parte	LNK501P

Spiegazioni elettronici	Energy Efficient, CV/CC Switcher for Very Low Cost Chargers and Adapters

PDF	20 Pages

Scroll/Zoom	100%

Produttore elettronici	POWERINT [Power Integrations, Inc.]

Homepage	http://www.powerint.com

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2 / 20 page

9/02

LNK501

Pin Functional Description

DRAIN (D) Pin:

Power MOSFET drain connection. Provides internal operating

current for start-up. Internal current limit sense point for drain

current.

CONTROL (C) Pin:

Error amplifier and feedback current input pin for duty cycle

and current limit control. Internal shunt regulator connection to

provide internal bias current during normal operation. It is also

used as the connection point for the supply bypass and auto-

restart/compensation capacitor.

SOURCE (S) Pin:

Output MOSFET source connection for high voltage power

return. Primary side control circuit common and reference

point.

Figure 3. Pin Configuration.

PI-2711-073107

P Package (DIP-8B)

G Package (SMD-8B)

LNK501

Figure 2. Block Diagram.

PI-2777-071802

SHUTDOWN/

AUTO-RESTART

PWM

COMPARATOR

CLOCK

SAW

OSCILLATOR

INTERNAL

SUPPLY

5.7V

4.7V

SOURCE

DMAX

CONTROL

5.7V

IFB

Z C

EDGE

HYSTERETIC

THERMAL

SHUTDOWN

LEADING

EDGE

BLANKING

CURRENT

LIMIT

ADJUST

LOW

FREQUENCY

OPERATION

SHUNT REGULATOR/

ERROR AMPLIFIER

DRAIN

IDCS

CURRENT LIMIT

COMPARATOR

÷ 8

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