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L6260 Datasheet(PDF) 26 Page - STMicroelectronics |
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L6260 Datasheet(HTML) 26 Page - STMicroelectronics |
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26 / 30 page  MATCAD ANALYSIS OF l6286 VCM CURRENT CONTROL LOOP (High Gain) (User specified parameters) Rc : = 240 ⋅ 103 Compensation resistance Cc : = 240 ⋅ 10-9 Compensation capacitance R1 : = 20 Coil resistance L : = 1.1 ⋅ 10-3 Coil inductance Cs : = 100 ⋅ 10-9 Snubber capacitace Rn : = 75 Snubber resistance Vdac := 40 ⋅ 10-3 DAC Voltage Rs : = 0.8 Sense resistance Id := Vdac Rs Output current Id = 0.05 (Device Parameters) gmn : = 24.2 ⋅ 10-6 Nulling OTA transconductance, with ± 20% variation Ron : = 3.18 ⋅ 106 Nulling OTA output resistance, with ± 50% variation Con := 50 ⋅ 10-12 Nulling OTA output capacitance, with ± 10% variation gm1 : = 1100 ⋅ 10-6 Main OTA transconductance, with ± 20% variation Ro1 : = 1.773 ⋅ 106 Main OTA output resistance, with ± 50% variation Co1 : = 1.6 ⋅ 10-12 Main OTA output capacitance, with ± 10% variation gm2 = 0.964 √ Id FET transconductance, with æ 10% variation gm2 = 0216 VA = 68.7 Early voltage of FET, with ± 5% variations Ro2 = VA Id FET output resistance Ro2 = 1.374 ⋅ 103 Ra : = 420 Predriver output resistance, with ± 20% variation Csb : = 10.2 ⋅ 10-12 FET source-bulk capacitance, with ± 10% variation Cdb := 49 ⋅ 10-12 FET drain-bulk capacitance, with ± 10% variation Cgd := 11 ⋅ 10-12 FET gate-drain capacitance, with ± 10% variation Cgs : = 156 ⋅ 10-12 FET gate source capacitance, with ± 10% variation 1ST STAGE (OTA) TRANSFER FUNCTION: i: = √ -1 f(n) : = 10 n S(n) : = 2 ⋅ i ⋅π ⋅ 10n n : = 2, 2.01, ⋅ 7 A1: = gmn ⋅ Ron ⋅ gm1 ⋅ Ro1 A1 = 1.501 ⋅ 105 fp1 = 1 2 ⋅ π ⋅ Ron ⋅ Con fp1 = 1.001 ⋅ 103 fp2 = 1 2 ⋅ π ⋅ Req ⋅ Co1 fp2 = 4.706 ⋅ 105 fz1 = gmn 2 ⋅ π ⋅ Con fz1 = 7.703 ⋅ 104 fzc = 1 2 ⋅ π ⋅ Rc ⋅ Cc fzc = 6.631 Req = Ro1 ⋅ Rc Ro1 + Rc Req = 2.114 ⋅ 105 fpc = 1 2 ⋅ π ⋅ (Rc + Ro1) ⋅ Cc fpc =0.791 L6260 26/30 |
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