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參數(shù)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(shù)： | 30/44頁 |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
30
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
3.3V linear regulator:
The Tda5345HT includes an analog amplifier suited to drive an external NPN that will supply the 3.3 V digital chips used
in the application
together with the internal digital outputs
(pins SpinDigOut (44), SpinMechClock (43), PowerFault
(37), ShockCompOut (52), TempMux (57)). The external pin Reg3v3PwrUp is used to enable (Reg3v3Pwr = 5 V) or
disable the regulator (Reg3v3Pwr = 0 V). When Reg3v3Pwr = 0 V, it is possible however to wake the regulator up through
the Reg3v3Enable bit (bit number 1 in register #4).
It has been designed to minimise the external components count.
Figure 25 shows the regulator diagram:
Negative supply regulator (-3 V) :
A capacitor-based negative supply regulator is also provided.
Due to process limitations, 2 external shottky diodes need to be added to the 2 external capacitors to make it work.
Figure 25 shows the regulator diagram:
Fig.25 3.3V linear regulator
RegNPNBase
(46)
Vdd5
RegSense(47)
internal
BandGap
voltage
reference
1.23V
800
1.24 k
2 k
5
μ
F
To 3.3V ICs
3.26V
Reg3v3PwrUp
Reg3v3Enable
(from serial interface)
Enable
(34)
2SC4210 or
similar NPN
decoupling
cap
SpinDigOut
PowerFault
SpinMechClock
ShockCompOut
TempMux
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