OPERATIONAL AMPLIFIERS DESCRIPTION

Each driver has two output stages scaled in cur-

rent by a factor K = 10.

In voltage mode configuration the two outputs are

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 (see Fig.2).

The supply voltage can be internally generated

by the DC-DC converter, or external, maintaining

the DC-DC converter in sleep mode (PIN3

shorted to ground), in this case the supply volt-

age can be 0 to V5/12+4 minimum value up to

70V in single supply or V5/12+4 to 35V symmetri-

cal to ground.

The drivers have 130dB DC gain and the Band-

width is 500KHz. Stability is guaranteed with a

minimum gain of 20dB, for a capacitive load in

the range 0.4nF up to 24nF.

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Vout0

OpAmp Output Voltage with 0V

Input Voltage

External feedback programmed

for DC gain value <30V/V

-1

+1

V

Reference Voltage PIN13

2.4

2.5

2.6

V

Reference Voltage Output Current

-1

+1

mA

Filter capacitor at PIN13

10

100

nF

Voltage shift value

1.0V

≤ Vin0-5 ≤ 3.5V

-2%

+2%

V

Shifter Gain

Analog Voltage Shifter DC

Voltage Gain

G

=

0.1

0.975

1.00

1.025

Shifter circuitry Band Width

3dB amplitude drop

2

MHz

External reference voltage

(PIN14)

2.0

2.6

V

Total current in Sleep Mode

PIN7 at 0 logic

800

µA

EAoff

DC-DC converter Error

Amplifier Input voltage Offset

-12

+12

mV

Error amplifier Current

Capability

±100

µA

HVP%

Total HVP precision

±0%

-4

+4

%

Voltage level for 0 logic at

digital input pin (Pin 1-4-7-15)

0.9

V

Voltage level for 1 logic at

digital input pin (Pin 1-4-7-15)

1.6

V

Decay period for

∆V = |19V|

140

340

µs

Operative period from Not

Selected phase to Selected

phase for each driver

4

µs

Note 1: Selectable by external resistors.

Note 2: Set by external Coil and Capacitor from 80 to 550KHz.

Note 3: Take into account the total power dissipation.

ELECTRICAL CHARACTERISTICS (continued)

22

24

26

28

30

32

34

36

Load DC Current (mA)

12V

11V

10V

9V

8V

7V

6V

5V

Figure 1. Load Regulation

L6660

4/9