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參數(shù)資料
| 型號： | L6271 |
| 廠商： | 意法半導體 |
| 英文描述： | MILLI-ACTUATOR DRIVER |
| 中文描述： | 毫執(zhí)行器驅(qū)動 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 72K |
| 代理商： | L6271 |
OPERATIONALAMPLIFIERS DESCRIPTION
Each driver has two output stages scaled in cur-
rent by a factorK = 10.
In voltage mode configuration the two outputsare
shorted.
In charge mode configuration OUT1 drives a ca-
pacitor Cint and is closed in feedback, while
OUTK drives the piezo, mirroring the current sup-
plied to Cint, with a current multiplied by a K fac-
tor (seeFig.1).
The supply voltage can be internallygeneratedby
the DC-DC converter,or external, maintaining the
DC-DC converter in sleep mode (PIN15 shorted
to ground), in this case the supply voltage can be
0 to V512+4 minimum value up to 80V in single
supply or V512+4to 40Vsymmetrical to ground.
The drivers have 130dB DC gain and the Band-
width is 500KHz. Stability is granted with a mini-
mum gain of 20dB, for a capacitive load in the
range 0.4nF up to 24nF.
The drivers can be supplied with HVP-HVM (dou-
ble supply mode) or with HVP-Ground (single
supply mode). In both cases they can achieve a
rail-to rail output dynamic range with a maximum
load currentof
±
75mA.
In double supply mode the input stage has -
5V/+5V dynamic range, while in single supply
modeit has1.2V up to 10Vinput dynamicrange.
A 2.5V internal reference voltage is available at
one pin (Vref) thatcan be used to close the feed-
back if the input signal is symmetrical around
2.5V.
In this case the output dynamic is symmetrical
around 2.5V. It is present a 2.5V down level
shifter that can be connected between the input
signal and the input of the opamp, to work inter-
nally witha signal symmetrical to ground.
DC-DC CONVERTER DESCRIPTION
The DC-DC converterinside the chip can be sup-
plied from 5V up to 12V and has two parts, one to
supply the positiveand one to supply thenegative
voltage.
The positive one takes the reference from the pin
DC
2
REF and multiplies it by 20 to have theoutput
voltage.
If DC
2
REF is lessthan0.6Vthe whole DC-DC con-
verter is shut down and the high voltages have to
be supplied from external. In Sleep Mode (sleep
pin) HVM is shorted to GND. When in single sup-
ply,no loadhas to be connectedto H-bridge output
andHVMmustbe connectedto GND.
The topology is a standard resonant full-wave
boost one: the LC oscillation is kept running all
the time and a set of comparatorsis used to syn-
chronize turning on and off of the power MOS in
order to have zero current and zero voltage
switching and furthermorecontrolledrectification.
The step-up converter is designed to work in
”Bang-Bang” mode and in Linear mode, in this
case an AC compensation network is required
(RC-comp) to guaranteethe stabilityin a wide op-
erative range (i.e. changing coil, load, output and
input voltage...).
In
Bang-Bang mode
(Bang/Lin=V512high condi-
tion) whenever the output HVP goes down fixed
threshold(Vt
h,out
= 20
DC
2
REF), the next oscilla-
tion phase is more powerful and is used to trans-
fer energyfrom the power supply to the output.
In
Linear mode
, according to the ouput voltage,
the current loaded into the coil is changing like a
-
+
HVP
HVM
Rb
1
1
K
K
C
Qpiezo=K*[Cint*(1+Ra/Rb)+C]*Vdac
Qpiezo=Cost*Vdac
Cost=k*[Cint*(1+Ra/Rb)+C]
Vdac
D98IN970A
Ra
R
P
Cpiezo
Cint
Figure 1. Charge Mode Configuration(only a suggestion,the applicationis completelyfree
accordingwith ElectricalCharacteristics).
L6270 - L6271
6/10
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