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ACT410US-T Datasheet(PDF) 11 Page - Active-Semi, Inc |
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ACT410US-T Datasheet(HTML) 11 Page - Active-Semi, Inc |
11 / 16 page ACT410 Rev 3, 27-Feb-14 Innovative PowerTM - 11 - www.active-semi.com Copyright © 2014 Active-Semi, Inc. Active-Semi Proprietary―For Authorized Recipients and Customers ActivePSR TM is a trademark of Active-Semi. TYPICAL APPLICATION CONT’D An EFD15 core is selected for the transformer. From th e manufacture’s catalog u e recommendation, the gapped core with an effective inductance ALE of 64 nH/T 2 is selected. The turn of the primary winding is: The turns of secondary and auxiliary winding can be derived accordingly: Determining the value of the current sense resistor (R9) uses the peak current in the design. Since the ACT410 internal current limit is set to 1V, the design of the current sense resistor is given by: Where Fsw is the frequency at 4.75V CC mode. The voltage feedback resistors are selected according to the Ioccmax and Vo. The design Io_cc max is given by: The design Vo is given by: Where k is IC constant and K=0.000075, then we can get the value: When selecting the output capacitor, a low ESR electrolytic capacitor is recommended to minimize ripple from the current ripple. The approximate equation for the output capacitance value is given by: Two 820µF electrolytic capacitors are used to keep the ripple small. PCB Layout Guideline Good PCB layout is critical to have optimal performance. Decoupling capacitor (C4) and feedback resistor (R5/R6) should be placed close to VDD and FB pin respectively. There are two main power path loops. One is formed by C1/C2, primary winding, Mosfet transistor and current sense resistor (R9). The other is secondary winding, rectifier D4 and output capacitors (C7/C6). Keep these loop areas as small as possible. Connecting high current ground returns, the input capacitor ground lead, and the ACT410 GND pin to a single point (star ground configuration). T 76 T / nH 64 mH 37 . 0 A L N 2 LE P P = = = (13) T 7 76 32 . 11 1 N N N N p p s S ≈ × = × = (14) T 20 7 28 . 2 N N N N s S A A ≈ × = × = (15) Ω η . 07 . 1 75 . 0 kHz 100 mH 37 . 0 5 6 . 2 2 1 F L V I 2 V R system SW P OUT OCP _ OUT CS CS ≈ × × × × = × × × × = (16) (17) D FB a s 2 fb 1 fb o V V N N ) R R 1 ( V − × × + = (18) K 5 . 11 R , K 68 R 2 fb 1 fb = = (19) F 364 mV 50 k 110 2 V f I C RIPPLE sw OUT OUT μ = × = × = (20) sw _ f cs cs p D O 2 fb 1 fb 2 fb 1 fb s p s K R V L V V R R R R N N f × × + × + × × = |
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