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LNK6XX3K Datasheet(PDF) 7 Page - Power Integrations, Inc. |
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LNK6XX3K Datasheet(HTML) 7 Page - Power Integrations, Inc. |
7 / 24 page Rev. C 03/14 7 www.powerint.com LinkSwitch-HP Figure 10. PROGRAM (PD) Pin Timing Diagram. VPDTHACR 3.40 V t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 tPDST ID ILIMIT tPD Programmable Shutdown Delay VFB SW 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. |
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