LNK6665ESLASHKSLASHV datasheet(7/24 Pages) POWERINT

7 / 24 page

Rev. E 06/15

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Figure 10. PROGRAM (PD) Pin Timing Diagram.

VPDTHACR 3.40 V

t1 t2

t10

tPDST

ID ILIMIT

tPD Programmable

Shutdown Delay

VFB

VPDTHRM 1.35 V

VPDI

VPDTHPDH 1.25 V

VPDTHPDL 0.535 V

PI-6692-101713

Fast AC Reset

Remote On/Off

OSC

This is an adjustable frequency oscillator. Based on error

voltage, the frequency will adjust from 32 kHz at light load to

132 kHz at heavy load. The oscillator employes ±5 kHz

frequency jitter to reduce EMI levels.

Current Limit Comparator

This is a high-speed current limit comparator. It compares the

current from the power MOSFET to the internal current reference.

Once the current reaches the threshold the MOSFET on-cycle

is terminated.

Multi-Cycle Modulation (MCM)

When voltage on COMPENSATION pin reaches V

C(MCM) (about

1.25 V) the peak drain current is reduced to 25% of programmed

value and the switching frequency approaches f

MCM = 32 kHz

(typical). During MCM operation the controller intelligently

maintains a relatively high output sampling rate while reducing

the average switching frequency to keep the output voltage in

regulation. Switching at 25% of the set current limit reduces the

transformer core flux density significantly. This and the intelligent

MCM operation reduce audible noise well below acceptable levels.

LNK666x has a maximum MCM off-time T

MCM(OFF) = 0.5 ms (typ.).

The high minimum output sampling rate provides excellent

transient load response from 0% to 50% or 100% of nominal

load while offering typically below 100 mW no-load input power.

LNK67xx has a maximum MCM off-time T

MCM(OFF) = 4 ms (typ.).

The lower minimum output sampling rate enables designs

below 30 mW no-load input power while providing fair transient

load performance for load steps from 0% to 50% or 100% of

nominal load.

LNK6665E/K/V Datasheet(PDF) 7 Page - Power Integrations, Inc.

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