IHLP Selection Example
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1 VISHAY DALE Magnetics IHLP-1616 APPLICATIONS IHLP-1616AB-01 IHLP-1616AB IHLP-1616BZ-01 IHLP-1616BZ Revision: 20-Apr-16 1 Document Number: 34251
2 IHLP-2020 APPLICATIONS Revision: 20-Apr-16 2 Document Number: IHLP-2020BZ-01 IHLP-2020BZ IHLP-2020CZ-01 IHLP-2020CZ
3 IHLP-2525 APPLICATIONS IHLP-2525AH IHLP-2525BD Revision: 20-Apr-16 3 Document Number: IHLP-2525AH-11 IHLP-2525BD-11
4 IHLP-2525 APPLICATIONS IHLP-2525CZ-01 IHLP-2525CZ IHLP-2525EZ-01 IHLP-2525EZ IHLP-2525CZ-5A Revision: 20-Apr-16 4 Document Number: 34251
5 IHLP-3232 APPLICATIONS Revision: 20-Apr-16 5 Document Number: IHLP-3232CZ-01 IHLP-3232CZ IHLP-3232DZ-01 IHLP-3232DZ IHLP-3232DZ-5A
6 IHLP-4040 APPLICATIONS Revision: 20-Apr-16 6 Document Number: IHLP-4040DZ-01 IHLP-4040DZ IHLP-4040DZ-5A
7 IHLP-5050 APPLICATIONS IHLP-5050CE IHLP-5050EZ Revision: 20-Apr-16 7 Document Number: IHLP-5050CE-11 IHLP-5050EZ-11
8 IHLP-5050 APPLICATIONS IHLP-5050FD IHLP-5050FD-5A Revision: 20-Apr-16 8 Document Number: IHLP-5050FD-11
9 IHLP-6767 APPLICATIONS Revision: 20-Apr-16 9 Document Number: IHLP-6767DZ-01 IHLP-6767DZ IHLP-6767GZ-01 IHLP-6767GZ
10 IHLP-6767 APPLICATIONS IHLP-6767GZ-5A IHLP-8787 APPLICATIONS IHLP-8787MZ-5A Revision: 20-Apr Document Number: 34251
11 IHTH-0750 APPLICATIONS IHTH-0750IZ-5A IHTH-0750JZ-5A Revision: 20-Apr Document Number: 34251
12 IHTH-1125 APPLICATIONS IHTH-1125KZ-5A IHTH-1125MZ-5A Revision: 20-Apr Document Number: 34251
13 VISHAY DALE Magnetics INPUT L REQ I DC I Freq. T AMB V-μs A 7.39 A 300 khz 50 C IHLP SELECTED Step 1. IHLP-4040DZ L DCR R TH P HEAT ET 100 K 0 K A 49 A C/W 1.48 W VERIFICATION Step 2. Step 3. Step 4. Step 5. Step 6. Step B PKOPER = x 100 = G f e = = Hz P CORE = x x x x = W The core losses are W which is less then 1 / 3 of P HEAT (0.493 W) P CUallowed = = 1.32 W R OPER = x = P DC = 20 2 x = W Step 8. Step 9. Step 10. P AC = x x x = W P TOTAL = = W T = x = C T OPER = = C I PEAK = = 23.7 A 2 = 49 A which is greater then the required 23.7 A Revision: 20-Mar-13 1 Document Number: 34252
14 SELECTION CRITERIA 1. Limit core losses (P CORE ) to 1 / 3 of total losses for 40 C temperature rise (P HEAT ). 2. Total copper losses allowed will be equal to P HEAT - P CORE. 3. Maximum component temperature should be kept 125 C, 155 C for -51 components. 4. Maximum T should be 40 C (this can be exceeded provided caution is taken to insure max. temperature 125 C/155 C). 5. I PEAK (recommended, I PEAK can exceed with caution due to soft saturation of IHLP product). GOVERNING EQUATIONS 1. B PKOPER ET ckt = x 100 G ET P DC = I 2 DC x R OPER W f f 0 e = Hz K f 1 Kb P CORE = K 0 f e Bpk x f0 x W P TOTAL = P CORE + P DC + P AC W T = P TOTAL x R TH C 4. P AC = K 1 x I 2 x f 0 x R OPER W 9. T OPER = T AMB + T C 5. R OPER R TYP x T AMB = A I I PEAK = I DC A 2 (1) Equation #5 assumes a 40 C temperature rise and will have the same units as R (2) For equations #3 f in Hz and B PK in G. (3) R OPER is based on a 40 C temperature rise. (4) K f is for -01 material, for -11 material, and for -51 material. (5) K b is for -01 material, for -11 material, and for -51 material. (6) For IHLP-2525EZ-01 - K f = and K b = SELECTION PROCESS Note This process assumes that the following is known: Required inductance, frequency, I DC, I, T AMB, and V-μs (ET) required. Step 1. Select inductor value based on controller data sheet recommendation and current (I DC ) rating. Step 2. Determine peak operational flux density in Gauss using equation #1. Step 3. Calculate effective frequency using equation #2. Step 4. Step 5. Determine core loss using equation #3 (see notes #1 and #2) and compare to selection criteria #1. If core losses are > 1 / 3 P HEAT select a larger inductor. DEFINITIONS ET ckt V-μs product of the circuit ET 100 V-μs product at 100 Gauss from table #1 P CORE Core losses in W P DC Losses due to the D CR of the inductor copper winding in W K 0 IHLP core constant from table #1 Step 6. Step 7. Step 8. Step 9. Use selection criteria #2 to determine allowable copper losses. Determine actual copper losses using equations #4, #5 and #6. Use equation #7 for total losses. Determine T using equation #8 and insure T OPER 125 C (155 C for -51 material) using equation #9. Step 10. Verify I PEAK is less then using equation #10 for the selected part (see selection criteria #5). f 0 Switching frequency in Hz R TH Thermal gradient of IHLP from Table #1 f e Effective frequency in Hz Duty cycle P AC - Losses in the coil due to AC effects K 1 - AC loss constant from Table #1 Revision: 20-Mar-13 2 Document Number: 34252
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