Rainbow-electronics MAX1638 Manual do Utilizador descarregar pdf (Página 7)

MAX1638

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

_______________________________________________________________________________________ 7

Figure 1. Standard Application Circuit

_____Standard Application Circuits

The predesigned MAX1638 circuit shown in Figure 1

meets a wide range of applications with output currents

up to 19A and higher. Use Table 1 to select compo-

nents appropriate for the desired output current range,

and adapt the evaluation kit PC board layout as neces-

sary. This circuit represent a good set of trade-offs

between cost, size, and efficiency while staying within

the worst-case specification limits for stress-related

parameters, such as capacitor ripple current.

The MAX1638 circuit was designed for the specified

frequency. Do not change the switching frequency

without first recalculating component values—particu-

larly the inductance, output filter capacitance, and RC1

resistance values. Table 2 lists the voltage adjustment

DAC codes.

_______________Detailed Description

The MAX1638 is a BiCMOS power-supply controller

designed for use in switch-mode, step-down (buck)

topology DC-DC converters. Synchronous rectification

provides high efficiency. It is intended to provide the

high precision, low noise, excellent transient response,

and high efficiency required in today’s most demand-

ing applications.

(OPTIONAL)

PWROK

BST

PGND

CSH

PDRV

NDRV

AGND

CC1

CC2

CC1

1000pF

CC2

0.056µF

REF

C4, 1.0µF

CERAMIC

RC1

AGND

100k

0.1µF

10µF

10Ω

TO V

FREQ

0.1µF

CMPSH-3

0.1µF

= 5V

LOCAL

BYPASSING

MAX1638

1µF

OUT

= 1.3V

TO 3.5V

LOAD

CSL

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

Comentários a estes Manuais

Sem comentários

Rainbow-electronics MAX1638 Manual do Utilizador Página 7

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics MAX1638