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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)： | 26/44頁 |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
26
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
The first amplifier gain is given by : G = C
gain
/C
sensor
. It has to be set so that the sensor voltage sensitivity becomes
220
μ
V/G on the 1 st stage output.
The 2
nd
amplifier stage gain is internally set to 16.3. The 3
rd
amplifier stage gain is internally set to 20. The external
capacitor C
com
and R
HPF
have to be chosen so that : C
com
x20 k
= C
gain
xR
HPF
. This time constant makes the input high
pass filter pole. The internal RC low pass filter pole is 8 kHz typical. The window of the comparator input (ShockCompInP)
is programmable through the serial interface. The values are given in the following table:
Table 16
Window comparator threshold versus ShockThresh[1:0] (bits [9,8] in register #4):
Temperature monitor:
The TDA5345HT includes an analog circuitry that monitors the junction temperature.
Figure 25 shows its diagram:
SHOCKTHRESH[1:0]
WINDOW
2ND STAGE INPUT
SENSITIVITY
000
001
010
011
100
101
110
111
74 mV
148 mV
222 mV
296 mV
370 mV
444 mV
518 mV
592 mV
227
μ
V
454
μ
V
681
μ
V
908
μ
V
1.135 mV
1.362 mV
1.589 mV
1.816 mV
Fig.18 Shock sensor control circuitry
ShockCompOut
ShockFiltOut
R
ShockInput
ShockCom
C
com
Window
comparator
programmable
threshold
Shock Sensor
(ext.)
C
ShockRef
C
sensor
+
-
380k
20k
Amplifier x20
+
-
Cgain
R
HPF
2V
ShockAmpOut
+
-
Amplifier x16.3
1
2
3
4
(50)
(55)
(54)
(51)
(53)
(52)
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