LTC1430A Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LTC1430A

High Power Step-Down Switching Regulator Controller

Linear Technology 

LTC1430A

BLOCK DIAGRAM

SHDN

FREQSET

COMP

SS

IMAX

VCC

12µA

12µA

DELAY

50µs

INTERNAL

SHUTDOWN

PWM

ILIM

FB

MIN

+–

1.265V

40mV

MAX

+

40mV

PVCC1

G1

PVCC2

G2

PGND

20k

12.4k

IFB

FB

SENSE+

SENSE –

1430 BD

TEST CIRCUITS

+

4.7µF

PVCC1 = 12V

PVCC2 = 5V

+

1µF

+

100Ω

1µF

0.1µF

0.01µF

PVCC2 PVCC1

VCC

G1

SS

IMAX

LTC1430A IFB

NC

FREQSET G2

SHUTDOWN

SHDN PGND

C1

220pF

COMP

GND

RC

7.5k

CC

4700pF

SENSE+

FB

SENSE–

+ CIN

220µF

×4

Q1A, Q1B

2 IN PARALLEL

2.7µH/15A

Q2

+ COUT

3.3V

330µF

×6

NC

Q1A, Q1B, Q2: MOTOROLA MTD20N03HL

CIN: AVX-TPSE227M010R0100

COUT: AVX-TPSE337M006R0100

Figure 1

6

FB MEASUREMENT

LTC1430A

SENSE+

FB

SENSE–

VOUT

NC 1.61k

1k

NC

1430 F01

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