參數(shù)資料
型號(hào)： TDA5345HT
廠商： NXP SEMICONDUCTORS
元件分類： 運(yùn)動(dòng)控制電子
英文描述： 5 V spindle & VCM driver combo
中文描述： DISK DRIVE MOTOR CONTROLLER, 2 A, PQFP64
封裝： LOW PROFILE, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 18/44頁(yè)
文件大?。?/td> 213K
代理商： TDA5345HT
1999 June 10
18
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
Spindle current loop
The spindle current I
Spin
is sensed by internal current mirrors and copied to an internal resistor R
SpinLoopGain
. The current
loop input is controlled by the internal FLL/PLL speed loop. The transconductance is defined by the following formula
(see Fig.3) :
(1)
The spindle current loop bandwidth is given by the following formula : (gm means transconductance : di/dv)
(2)
where the typical values for gm
OTA
and gm
NMOS
are : gm
OTA
= 50
μ
A/V & gm
NMOS
= 2.62 x Sqrt(I
Spin
) A/V
BW
SpinCurLoop
should be kept <= 20 kHz, whatever the current. Take care of the fact that the higher the current, the higher
the BandWidth => the bandwidth is maximum at Start-Up.
To make sure that the OTA output is 0V when Run/Stop bit = ‘0’, a 30 mV (typ.) offset is introduced inside the OTA. By
this way, we make sure that SpinCompens external capacitor is kept discharged until the next start-up.
Spindle FLL/PLL speed loop :
An internal speed loop is provided, intended to work with
12 poles
spindle motors. It is mainly composed of a Frequency
Locked Loop. A Phase Locked Loop can be associated when bit 9 in register #5 (PllOn/Off) is ‘1’. The typical FLL charge
pump current is 500
μ
A while the typical PLL charge pump current is given in table 7 :
Table 7
PLL charge pump typical current (PllCur[1,0] are bits 8 & 7 in register #5):
A 15-bit division factor (Speed[14, 0]) is used to set the required speed split in bits [11, 9] in register #5 and bits [11, 0]
in register #6:
The Speed[14, 0] division factor can be calculated by :
(3)
Where CLOCK is between 10 MHz and 33 MHz.
When the spindle is not running (Run/Stop = ‘0’) the FLL charge pump discharge current is active so that the external
filter is discharged before the next start-up. When the spindle is running (Run/Stop = ‘1’), the speed can be continuously
monitored on pin SpinMechClock (1 pulse per revolution / 50% duty cycle waveform).
SPINDLE / VCM 6-bit current DAC:
An internal 6-bit current DAC is used to limit the spindle start-up current (bit 6 in register #5 : Dac6ToVcm = ‘0’) or to
cancel the VCM loop offset ( Dac6ToVcm = ‘1’).
PLLCUR[1,0]
PLL CH. PUMP CURRENT
00
01
10
11
0.25
μ
A
0.5
μ
A
0.75
μ
A
1
μ
A
G
Spin
A
( )
V
( )
[
]
I
V
SpinSpeedFilter
--------------------------------------------
R
SpinLoopGain
------------530
1700
----530
=
=
=
=
BW
SpinCurLoop
gm
OTA
---------------------------------------530
R
2
π
C
×
------------------------------------
×
gm
NMOS
×
SpinCompens
6
–
I
C
SpinCompens
-----------------------------------
×
=
=
Speed 14 0
]
5
3
SpindleSpeed rpm
)
------------------CLOCK
×
=
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