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參數(shù)資料
| 型號： | TLS2230 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Servo-Combination Predriver(伺服-組合預(yù)驅(qū)動器) |
| 中文描述： | 伺服組合預(yù)驅(qū)動器（伺服-組合預(yù)驅(qū)動器） |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 265K |
| 代理商： | TLS2230 |
TLS2230
SERVO-COMBINATION PREDRIVER
SQHS017 – MAY 1996
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
voice-coil motor (VCM) predriver
The TLS2230, when combined with a power driver such as the TPIC150x, provides current-drive capability for
the VCM. Figure 2 shows a typical application; PWM signals applied to SPWMAI and SPWMBI indicate the level
of current to be delivered to the VCM. External resistors on the SPWMAO and SPWMBO outputs scale the PWM
signals to increase the effective resolution of the PWM input. Amplifier A3 filters these signals so that the
information contained in their respective duty cycles is represented by an appropriate voltage level. This
voltage, which represents the command current, is applied to a transconductance loop. The output of the
summing amplifier (ERR) is the difference between the commanded current and the actual current as measured
across RSEN by the differential amplifier (ASEN). This error signal is applied to the predriver that biases the
power FETs of the TPIC150x for class AB operation.
Retract
VCM
Predriver
Amplifier
ERR
VREF
VREF2
PWMA
PWMB
RSEN
GPA
VCMA
GNA
GPB
GNB
VCMB
GLS
ISET
ASEN
S
S
S
S
E
A
A
E
S
From
Voltage
Monitor
TLS2230 VCM Predriver
G = 2.73
RSEN
V12
TPIC150x
VREF
+
–
+
–
VCM
+
–
Figure 2. Voice-Coil Motor Typical Application
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