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LTC2970CUFD Datasheet(PDF) 33 Page - Linear Technology |
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LTC2970CUFD Datasheet(HTML) 33 Page - Linear Technology |
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33 / 36 page  LTC2970/LTC2970-1 33 29701fc APPLICATIO S I FOR ATIO 4. Solve for R30B and R31B. RB RA V V mV V RR FB FB 30 40 236 0 8 10 1 10 1 0 0 ≤ •− − − () •+ μ . 2 20 10 5 236 0 8 0 8 10 08 ⎛ ⎝⎜ ⎞ ⎠⎟ = • −−− (. . . ) . k AVV mV V Ωμ ••+ ⎛ ⎝⎜ ⎞ ⎠⎟ = 1 4 750 1 5 970 2 870 ,, , ΩΩ Ω RB RA V V mV V RR FB FB 31 41 236 0 8 10 1 11 1 1 1 ≤ •− − − () •+ μ . 2 21 10 5 236 0 8 0 8 10 08 ⎛ ⎝⎜ ⎞ ⎠⎟ = • −−− (. . . ) . k AVV mV V Ωμ ••+ ⎛ ⎝⎜ ⎞ ⎠⎟ = 1 3 880 1 8 250 2 863 ,, , ΩΩ Ω For coincident tracking to occur Equation 17 also must be satisfied: RB R RB R 30 20 31 21 = →=• = • = RB RB R R 30 31 21 20 2 863 8 250 5 970 2 078 , , ,, Ω Ω ΩΩ Ω →= • = • = RB RB R R 31 30 20 21 2 870 5 970 8 250 3 957 , , ,, Ω Ω ΩΩ Ω Let R30B = 2,100Ω and R31B = 2,890Ω. 5. Solve for R30A and R31A. Referring to Equation 18: RA R R R VV V DC MAX DC NOM DC 30 20 1 20 10 00 ≤ + ⎛ ⎝⎜ ⎞ ⎠⎟ • − ,, 0 0 30 5 970 1 5 970 4 750 , , , , NOM RB ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ −= + ⎛ ⎝⎜ ⎞ ⎠ Ω Ω Ω⎟⎟ • − ⎛ ⎝⎜ ⎞ ⎠⎟ −= 105 1 1 2 100 50 806 . ,, ΩΩ RA R R R VV V DC MAX DC NOM DC 31 21 1 21 11 11 ≤ + ⎛ ⎝⎜ ⎞ ⎠⎟ • − ,, 1 1 31 8 250 1 8 250 3 880 , , , , NOM RB ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ −= + ⎛ ⎝⎜ ⎞ ⎠ Ω Ω Ω⎟⎟ • − ⎛ ⎝⎜ ⎞ ⎠⎟ −= 105 1 1 2 890 49 888 . ,, ΩΩ Let R30A = 49.9kΩ and R31A = 48.7kΩ. 6. Solve for Channel 1’s tracking counter delay relative to Channel 0, CH1_A_DELAY_TRACK(). First, recalculate the values of VDCn,NOM based on the final values of R1n and R2n: VV R R IR V DC NOM FB FB 0 1 20 10 20 08 1 , . ′ =• + ⎛ ⎝⎜ ⎞ ⎠⎟ +• = • ++ ⎛ ⎝⎜ ⎞ ⎠⎟ += 5 970 4 750 0 1 805 , , . Ω Ω V VV DC NOM 1 08 1 8 250 3 880 0 2 501 , . , , . ′ =• + ⎛ ⎝⎜ ⎞ ⎠⎟ += Ω Ω V V Next, apply Equation 19: CH A DELAY TRACK VV R DC NOM DC NOM 1 10 __ _ () ,, = ′ − ′ ()• 331 21 141 2 501 1 805 2 890 B R A count R VV μ / .. , • = − ()• Ω 8 8 250 110 5 23 , /. Ω Ω μA count k counts • = 7. Solve for the IDAC0 and IDAC1 terminal tracking codes, Chn_a_idac_track[7:0]. Ch a idac Ch a idac V A 07 0 1 7 0 255 08 1 __ [ : ] _ _ [ : ] . == − μ //. LSB k • = 10 5 179 Ω |
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