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LM2576S Datasheet(PDF) 15 Page - Semtech Corporation |
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LM2576S Datasheet(HTML) 15 Page - Semtech Corporation |
15 / 19 page 15 ã 2001 Semtech Corp. www.semtech.com LM2575 & LM2576 POWER MANAGEMENT 5 7 5 2 M L6 7 5 2 M L C N I F µ 7 4F µ 0 0 1 1 D A 3A 7 1 L H µ 0 0 1H µ 8 6 C T U O F µ 0 0 7 , 2F µ 0 0 8 , 6 I T U O A m 0 5 2A m 0 0 5 5 7 5 2 M L6 7 5 2 M L C N I F µ 7 4F µ 0 0 1 1 D A 3A 7 1 L H µ 0 0 1H µ 8 6 C T U O F µ 0 7 4F µ 0 0 7 , 2 I T U O A m 0 0 1A m 0 5 7 Inverting buck/boost operation is a different topology of operation than buck. This difference reduces the output current capability of the device, in that the inductor must supply all of the load current during the time the power switch is off. Maximum output current is approximately: ) 2576 LM ( V V 1 2 5 . 3 I IN O OUT + ≈ ) 2575 LM ( V V 1 2 3 . 1 I IN O OUT + ≈ Component stress requirements are very similar to the buck with a few exceptions: (1) catch diode breakdown V BR must be greater than V IN + |VOUT| (2) input capacitor is larger due to the increased peak current during switch turn on. Power dissipation is approximately: IN O IN SAT IN O O IN O O D V V V 02 . 0 V V V 1 I V V V P + + + ≈ Please contact factory for additional assistance when using the buck/boost topology. Applications Information - Inverting Buck/Boost |
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