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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC453TSTRT датащи(PDF) 19 Page - Semtech Corporation |
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SC453TSTRT датащи(HTML) 19 Page - Semtech Corporation |
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19 / 26 page  19 © 2009 Semtech Corp. www.semtech.com POWER MANAGEMENT SC453 Step 4 — BOOTV Design The boot-up voltage for V CORE is set at 1.2V. For the SC453 typical application circuit, R3, R4, and R5 form a voltage divider off V REF and are used to set the boot voltage. For simplicity R BOOT : = R3 + R4. VBOOT 1.2 V := RHYS 1 1 R25 1 RBOOT R5 + + := RBOOT VBOOT R5 ⋅ VREF VBOOT − := Step 5 — Sleep Voltage Design The sleep voltage is set at 0.750V nominally using the R3 - R4 - R5 divider. VSLP 0.750 V := R3, R4, and R5 are calculated using a matrix to solve the simultaneous equations. R14 is set at 1M Ω as a place- holder: R14 1000 K Ω := Mx 1 1 1 1 1 VSLP 1 − VREF VSLP − ⋅ 1 VBOOT VREF VBOOT − − VSLP 1 − VREF VSLP − ⋅ ⎛ ⎜ ⎜ ⎜ ⎜ ⎜ ⎜ ⎝ ⎞ ⎟ ⎟ ⎟ ⎟ ⎟ ⎠ := Applications Information (Cont.) From the standard 1% resistor value table, the following values are chosen according to the calculation results. R5 = 33.2K Ω. R4 = 30.1K Ω R3 = 49.9K Ω Step 6 — Current Limit Calculation Setting the threshold for current limit is a relatively straight- forward process. To do this the peak current calculation is based on the maximum DC value plus the worst-case ripple current. The following calculations apply for a single phase. Worst-case ripple occurs at the highest input volt- age. Since ripple is also inversely proportional to induc- tance, it is recommended that the minimum inductance value be used based on the manufacturer’s specified tol- erance: LLOW L1 120 % − () ⋅ := LLOW 4.8 10 7 − × H = IRIPPLE_MAX VINMAX VMAX_NL − ()d MIN ⋅ LLOW FS ⋅ := v R14 RHYS ⋅ R14 RHYS − 0 0 ⎛⎜ ⎜ ⎜ ⎜ ⎜⎝ ⎞ ⎟ ⎟ ⎟ ⎟⎠ := soln lsolve Mx v , () := soln 5.011 10 4 × 3.007 10 4 × 3.341 10 4 × ⎛ ⎜ ⎜ ⎜ ⎜ ⎝ ⎞ ⎟ ⎟ ⎟ ⎠ Ω = R4 3.007 10 4 ×Ω = R4 010 ( ) soln ⋅ := R5 3.341 10 4 ×Ω = R5 001 ( ) soln ⋅ := R3 100 ( ) soln ⋅ := R3 5.011 10 4 ×Ω = R3 VSLP R4 R5 + () VREF VSLP − ⋅ := IRIPPLE_MAX 6.777 A = |
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