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TDA5147CH Datasheet, PDF (24/32 Pages) NXP Semiconductors – 12 V Voice Coil Motor VCM driver and spindle motor drive combination chip | |||
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Philips Semiconductors
12 V Voice Coil Motor (VCM) driver and
spindle motor drive combination chip
EQUATIONS
Gain from VFLTINP to VFLTOUT:
V--V---F-F--L-L--T-T--O-I-N--U--P-T----â-â---V-V---r-r-e-e-f-f-o-o-u-u--tt = 2
Gain from VFLTOUT to VISENS1 (under closed loop VCMINP = Vrefout):
V-----F---L---T---O----U-R--T---1--â----V----r--e--f--o--u--t = -V----I-S----E---N----S--R-1---2-â-----V----r-e---f-o---u--t or V--V---F-S--L--E-T--N-O---S-U--1-T---â--â---V-V---r-er--e-f-of--o-u-u-t-t = RR-----12--
Gain of VISENS1 relative to â Vs (voltage across Rs):
HAVE -V----1----â--4---V-R---r--e--f-o---u--t= V-----I-S--R--E---N----H- -V----1----â-----4V---R-S---E----N---S----1- = V-----I-S--R--E---N----L-
SUB 1-----â----4-V---R-r--e--f-o---u--t = -V----I-S----E---N----L---R-â----V----I--S---E----N---H-- = â---R-V----s- or -V----S---E---N----S--â-1--V--â--s---V----r--e--f--o--u--t= 4
Transconductance equation:
Gm = -V----F---L---T---I-N----IP--c--o-â-i-l--V----r--e---f--o---u--t = â--R--V---s-s- Ã V-----F---L---T---I-N----P--1---â----V----r--e--f--o--u--t
From equation (1): Gm = â--R--V---s-s- -V----F---L---T---O----U---T-2----â----V----r--e--f--o--u--t
From equation (2): Gm = â--R--V---s-s- Ã 2 Ã RR-----21-- ( VSENS1 â Vrefout)
From equation (3) and (4): Gm = -R-1---s- Ã 14-- Ã 2 Ã RR-----21-- = 12-- Ã R--1---s- Ã RR-----21--
Preliminary speciï¬cation
TDA5147CH
(1)
(2)
(3)
(4)
(5)
1997 Jul 09
24
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