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參數(shù)資料
| 型號： | 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)： | 27/44頁 |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
27
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
The device is protected against over-temperature by the temperature shutdown circuit. When the temperature of the chip
exceeds 160
°
C, the device is automatically set to a VCM retract and a spindle disable mode. It remains in this mode
until the temperature goes below 160
°
C - 30
°
C = 130
°
C (30
°
C is an internal hysteresis).
During normal operation, the signal TempMux provides either a voltage that is function of the chip temperature when
TempSelect = ‘1’ or a digital warning when TempSelect = ‘0’.
When the analog information is selected, the equation of the voltage versus the temperature is:
(18)
When the digital information is selected, you get a temperature warning on pin TempMux (57). If the internal temperature
over passes 145
°
C, TempMux = ‘1’ and remains high until the temperature comes below 130
°
C (see Fig.19).
IT IS STRONGLY ADVISED TO USE THE TempMux INFORMATION (analog or digital) TO GENERATE EMERGENCY
PROCEDURES INSTEAD OF WAITING FOR THE TEMPERATURE SHUT DOWN MODE TO TRIGGER. The
temperature shut down has to considered as an ultimate self-protection.
Fig.19 Temperature monitor circuitry
TempMux
TempSelect
(bit 0, reg#3)
junction thermometer
Voltage
Converter
V
160_Deg
V
145_Deg
55
Temp shut
1
0
V
TempMux
2.954
7.55 10
3
–
Temperature
°
C
(
)
×
–
=
Fig.20 V
TempMux
behaviour versus temperature (TempSelect = ‘1’)
130
145
TEMPERATURE (
°
C)
V
TempMux
(V)
0
Vdd5
0
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