LT3572 Просмотр технического описания (PDF) - Linear Technology

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LT3572

Dual Full-Bridge Piezo Driver with 900mA Boost Converter

Linear Technology 

LT3572

APPLICATIONS INFORMATION

of several ceramic capacitor manufacturers. Consult the

manufacturers for detailed information on their entire

selection of ceramic parts.

Table 2. Ceramic Capacitor Manufacturers

Taiyo Yuden

(408) 573-4150

www.t-yuden.com

AVX

(803) 448-9411

www.avxcorp.com

Murata

(714) 852-2001

www.murata.com

Diode Selection

A Schottky diode is recommended for use with the LT3572.

The Philips PMEG 3005 is a good choice. If the switch

voltage exceeds 30V, a PMEG 4005 (a 40V diode) can be

used. These diodes are rated to handle an average forward

current of 0.5A. For higher efficiency, use a diode with bet-

ter thermal characteristics such as the On Semiconductor

MBRM140 (a 40V diode).

Layout Hints

As with all switching regulators, careful attention must be

paid to the PCB board layout and component placement.

To maximize efficiency, switch rise and fall times are made

as short as possible. Note the vias under the Exposed Pad.

These should connect to a local ground plane for better

thermal performance.

TYPICAL APPLICATION

VIN

3V TO 5V

L1

12μH

D1

C3

4.7μF

2

R4

100k

10

11

12

7

6

3

15

VIN

SHDN

SHDNA

SHDNB

PWMA

PWMB

SYNC

PGOOD

1

SW

LT3572

8

VOUT

FB 13

OUTA 18

OUTA 19

4 RT

OUTB 17

R3 14 SS

34k

C2

10nF

OUTB 16

GND

5, 9, 20, 21

C4 R1

20pF 576k

R2

24.9k

VOUT

30V

50mA

C1

10μF

3572 TA02

3572fa

10

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