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LNK304D Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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LNK304D Datasheet(HTML) 5 Page - Power Integrations, Inc. |
5 / 20 page 2-5 LNK302/304-306 5 Rev. I 11/08 Figure 6a. Recommended Printed Circuit Layout for LinkSwitch-TN in a Buck Converter Configuration using P or G Package. cycles are skipped. To provide overload protection if no cycles are skipped during a 50 ms period, LinkSwitch-TN will enter auto-restart (LNK304-306), limiting the average output power to approximately 6% of the maximum overload power. Due to tracking errors between the output voltage and the voltage across C3 at light load or no load, a small pre-load may be required (R4). For the design in Figure 5, if regulation to zero load is required, then this value should be reduced to 2.4 k Ω. Key Application Considerations LinkSwitch-TN Design Considerations Output Current Table Data sheet maximum output current table (Table 1) represents the maximum practical continuous output current for both mostlydiscontinuousconductionmode(MDCM)andcontinuous conduction mode (CCM) of operation that can be delivered from a given LinkSwitch-TN device under the following assumed conditions: 1) Buck converter topology. 2) The minimum DC input voltage is ≥70 V. The value of input capacitance should be large enough to meet this criterion. 3) For CCM operation a KRP* of 0.4. 4) Output voltage of 12 VDC. 5) Efficiency of 75%. 6) A catch/freewheeling diode with t rr ≤75 ns is used for MDCM operation and for CCM operation, a diode with t rr ≤35 ns is used. 7) The part is board mounted with SOURCE pins soldered to a sufficient area of copper to keep the SOURCE pin temperature at or below 100 °C. *KRP is the ratio of ripple to peak inductor current. LinkSwitch-TN Selection and Selection Between MDCM and CCM Operation Select the LinkSwitch-TN device, freewheeling diode and output inductor that gives the lowest overall cost. In general, MDCM + PI-3750-121106 C2 L1 L2 R1 R3 RF1 D3 D4 D2 D1 C1 C3 C5 C4 Optimize hatched copper areas ( ) for heatsinking and EMI. D S S FB BP S S LinkSwitch-TN AC INPUT DC OUTPUT Figure 6b. Recommended Printed Circuit Layout for LinkSwitch-TN in a Buck Converter Configuration using D Package to Bottom Side of the Board. AC INPUT + DC OUTPUT PI-4546-011807 Optimize hatched copper areas ( ) for heatsinking and EMI. S S S S BP FB D1 C2 R3 RF1 D3 D4 D2 R1 C1 C4 C5 C3 L2 L1 D |
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