L6260 datasheet(26/30 Pages) STMICROELECTRONICS

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

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 =

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

S(n) : = 2

⋅ i ⋅π ⋅ 10n

n : = 2, 2.01,

⋅ 7

A1: = gmn

⋅ Ron ⋅ gm1 ⋅ Ro1 A1 = 1.501 ⋅ 105

fp1

⋅ π ⋅ Ron ⋅ Con

fp1 = 1.001

⋅ 103

fp2

⋅ π ⋅ Req ⋅ Co1

fp2 = 4.706

⋅ 105

fz1

gmn

⋅ π ⋅ Con

fz1 = 7.703

⋅ 104

fzc

⋅ π ⋅ Rc ⋅ Cc

fzc = 6.631

Req

Ro1 ⋅ Rc

Ro1

+ Rc

Req = 2.114

⋅ 105

fpc

⋅ π ⋅ (Rc + Ro1) ⋅ Cc

fpc =0.791

L6260

26/30

L6260 데이터시트(PDF) 26 Page - STMicroelectronics

L6260 데이터시트(HTML) 26 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

데이터시트 다운로드

링크 URL