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參數資料
| 型號： | TDA5345HT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 運動控制電子 |
| 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： | 15/44頁 |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
15
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
The digital control block ignores any crossing while the
Blank1
timer is counting. This means that the zero-crossing
caused by the fly-back pulse leading edge (Z
C1
) is not seen by the commutation block.
The
WatchDog
timer makes sure that the motor is running forward. If the motor is going backwards, the BEMF voltage
will be inverted and the second crossing (Z
C2
) of the inductive pulse will not occur until the actual BEMF zero crossing.
Therefore, if the WatchDog timer expires before a zero-crossing occurs, the motor is assumed to be turning backwards.
The commutation is advanced one step to correct this condition. The second inductive zero-cross (Z
C2
) must occur within
the WatchDog time. Therefore, the WatchDog must be set to a time that is greater than the fly-back pulse duration
measured when the motor is standing still.
The
Blank2
timer starts counting as soon as the second zero-cross (Z
C2
) occurs. After the second inductive
zero-crossing all extra zero-crossings are ignored during the Blank2 time. This allows the coil voltage to ring slightly
without causing a commutation advance.To make the chip smaller, Blank1 and Blank2 have the same value: Blank.
If the motor is not spinning, no BEMF zero-crossing will occur. The
StartUp
timer detects this if it expires before the true
zero-crossing (Z
C3
) has occurred. It will advance the commutation one step if this happens.
The Commutation Delay Limiter (
ComDeLim
) allows to control the maximum commutation delay time. This commutation
delay time is equal to half the measured delay between 2 zero crossings
(
Zc
measured
). ComDeLim value should be
fly-back pulse
Commutation
true zero crossing
WatchDog
Blank1
Blank2
Commutation
delay
StartUp
Fig.8 A typical motor commutation diagram
CENTER TAP
Commutation
false zero crossings
Zc
1
Zc
2
Zc
3
SpinMotA
SpinMotB
SpinMotC
ZOOM
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