Linear Technology 630 Manuel utilisateur

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 630

PIEZOCERAMIC MICROACTUATOR DRIVER WITH BOOST REGULATOR

LT3469ETS8

DESCRIPTION

Demonstration circuit 630 is a gm amplifier circuit using the

LT®3469ETS8 and can drive an output up to 34V at 25mA

from 5V or 12V supply. An internal Boost converter of the

LT3469 generates a supply voltage up to 36V for the gm

amplifier. This regulator switches at 1.5MHz, allowing the

use of a tiny external inductor and capacitor. The 36V output

capability of the switching regulator along with the high

supply voltage of the amplifier combine to allow the wide

output voltage range needed to drive a piezoceramic

microactuator.

Design files for this circuit board are available. Call the

LTC factory.

LT is a trademark of Linear Technology Corporation

QUICK START PROCEDURE

Demonstration circuit 630 is easy to set up to evaluate the

performance of the LT3469ETS8. Refer to Figure 1 for proper

measurement equipment setup and follow the procedure

below:

NOTE:

When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the V

or V

OUT

and GND terminals. See Figure 2 for proper

scope probe technique.

With power off, connect the input power source V

to the

VIN and GND terminals, connect Vinput to INPUT+ and

GND terminals.

Apply V

=4.75V, Vinput=1V, and Iout=0mA (no load).

Check the boost regulator output Vcc=34.8V±5%, and

input current Iin within the range of 21mA to 35mA.

Apply V

=4.75V, Vinput=1V, and Iout=2mA (2mA load at

OUT

). Check the boost regulator output Vcc=34.6V±5%,

and the input current Iin within the range of 34mA to

50mA.

Apply V

=16V, Vinput=1V, and Iout=0A (no load). Verify

the boost regulator output Vcc=35.2±5%.

Apply V

=5V, Vinput=0.1V, check the amplifier output

OUT

= within the range of 0.87V to 1.12V.

Apply V

=5V, Vinput=3V, check the amplifier output

OUT

= 33V±2%,

Apply V

=5V and pulsed square wave input that swings

from 0.1V to 2.8V and has period of 300µs to Vinput, and

apply 27nF capacitor load to the output. Verify V

OUT

and

Iout as shown in Figure 3.

Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 630

PIEZOCERAMIC MICROACTUATOR DRIVER WITH BOOST REGULATOR

IOUT

VIN

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

VIN

GND

Downloaded from Arrow.com.Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 630

PIEZOCERAMIC MICROACTUATOR DRIVER WITH BOOST REGULATOR

Figure 3. Ch2: Vinput. Ch3: Vout. Ch4: Iout, 100mA/Div

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 630

PIEZOCERAMIC MICROACTUATOR DRIVER WITH BOOST REGULATOR

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

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