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參數(shù)資料
| 型號(hào)： | L6246 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | VOICE COIL MOTOR CONTROLLER, 3 A, PQFP44 |
| 封裝： | 10 X 10 MM, PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 162K |
| 代理商： | L6246 |
Obsolete
Product(s)
- Obsolete
Product(s)
BLOCK DESCRIPTION
POWER AMPLIFIERS
The two power amplifiers are connected in bridge
configuration working in AB class.
SENSE AMPLIFIER
This stage senses the voltage drop across the
Rsense.
The input stage is supplied by the charge pump
voltage to have an high dynamic, while the other
sections of the amplifier are supplied by the volt-
age of 10.5V internally regulated to have an high
power supply rejection (this voltage, supplies also
the error amplifier, the input amplifier and the op-
erational amplifier which generates the Vcc/2 volt-
age).
The open loop gain is around 80dB and the band-
with is more than 1MHz.
The voltage gain is fixed internally at 10 V/V.
ERROR AMPLIFIER
This is the stage which compares the input volt-
age and the sense voltage, generating the control
voltage for the power section.
The open loop gain and bandwith of this amplifier
are similar to the sense amplifier.
The negative input and the output of the error am-
plifier are accessible externally in order to have
the current loop compensation user configurable.
The dynamic of the output is limited at +/- 2Vbe to
have a faster response of the output voltage.
INPUT AMPLIFIER
The inputs and the output pins are externally ac-
cessible to have the possibility to configure the
transconductance gain of the current control loop
selecting the voltage gain of this amplifier.
The open loop gain and bandwith of this amplifier
are similar to the sense amplifier.
REFERENCE VOLTAGE GENERATOR
This block generates the two reference voltage
Vcc/2 and +5VREF.
The Vcc/2 voltage is used as reference by the
current control loop.
The +5VREF is a very stable voltage generator
that can be used as reference voltage of an exter-
nal DAC.
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
POWER AMPLIFIER
Rdson
DMOS on resistance
at 25°C
0.3
Gdv
Differential voltage gain
32
V/V
Iol
Output current leakage
500
A
SR
Output slew rate
0.4
V/
s
Tsr
Saturation recovery time
5
s
GBW
Gain bandwidth product
100
KHz
RETRACT
Vr
Max. retract voltage
Vcc shorted to GND
300
mV
Vr
Max. retract voltage
Vcc Normal
1
V
CHARGE PUMP
Cs
Storage capacitor
1
F
Vs
Storage voltage
Vcc +4
V
Cp
Pump capacitor
0.2
F
RETRACT TRUTH TABLE
Input
Output
-Retract
+Enable
Bridge Enable
+Retract
Brake and Retract
0
X
0
1
Run
1110
Disable
1000
L6246
6/12
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