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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 |
| 文件頁數(shù)： | 23/44頁 |
| 文件大小： | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
23
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
During the VCM brake, VCM power transistors N- & N+ are switched fully On while transistors P- & P+ are switched off.
During the soft retract step, N- transistor is switched off while the retract PMOS brings some current to the VCM. The
control loop is drawn in figure 14 (the voltage on VcmMinus is regulated).
Fig.15 Power transistors structure during a retract phase
(ext.)
VDD=5V
GND=0V
SpinRectBemf
Vcm-
Vcm+
Off
Off
Off
On
PA
NA
PB
NB
PC
NC
Retract PMOS
PA (resp. PB, PC) is switched On
when MotA (resp. MotB, MotC) is above
SpinRectBemf
NA (resp. NB, NC) is switched On
when MotA (resp. MotB, MotC) is below
GND
The back-EMF is synchronously rectified
by the spindle power transistors:
(ext.)
MotA
MotB
MotC
Isolation switch, used in reverse mode
1
2
10
5
15
9
4
14
63
62
(ext.)
(ext.)
(ext.)
P-
P+
N-
N+
VCM
Rsense
Fig.16 VCM retract circuitry
RetPmosDrain
SpinRectBemf
retract amplifier
(2)
(62)
Retract PMOS
Internal voltage reference
=> 125 mV in slow retract
=> 250mV in full power.
Programmable
voltage divider
VCM
(11)
On
VcmPlus
Rsense
(ext.)
VcmMinus
(6)
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