Datasheet > LNK6668K

LNK6668K

更新时间： 2022-09-29 18:24:56

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
24页	2266K
描述
IC LINKSWITCH 48W 68W 12ESOP

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数据手册

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LNK6668K 数据手册

LinkSwitch-HP

V_FB

Fast AC Reset

V_PDTHACR3.40 V

t_PDProgrammable

Shutdown Delay

V_PDI

ID I_LIMIT

Remote On/Off

V_PDTHRM1.35 V

V_PDTHPDH1.25 V

t_PDST

V_PDTHPDL0.535 V

t1 t2

t10

PI-6692-101713

Figure 10. PROGRAM (PD) Pin Timing Diagram.

OSC

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.

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.

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.

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

Rev. E 06/15

www.power.com

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