Rainbow-electronics MAX15041 Manual de usuario descargar pdf (Pagina 15)

MAX15041

Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM

Step-Down DC-DC Regulator with Internal Switches

______________________________________________________________________________________ 15

2) Place capacitors on V

, IN, and SS as close as

possible to the IC and the corresponding pin using

direct traces. Keep the power ground plane (con-

nected to PGND) and signal ground plane (connect-

ed to SGND) separate. PGND and SGND connect at

only one common point near the input bypass

capacitor return terminal.

3) Keep the high-current paths as short and wide as

possible. Keep the path of switching current short

and minimize the loop area formed by LX, the output

capacitors, and the input capacitors.

4) Connect IN, LX, and PGND separately to a large

copper area to help cool the IC to further improve

efficiency.

5) Ensure all feedback connections are short and

direct. Place the feedback resistors and compensa-

tion components as close as possible to the IC.

6) Route high-speed switching nodes (such as LX and

BST) away from sensitive analog areas (such as FB

and COMP).

MAX15041

4.7µH

BST

47Ω

INPUT

4.5V TO 28V

BST

OUTPUT = 3.3V

PGND

COMP

10kΩ

VDD

1µF

BST

OUT

22µF

45.3kΩ

10.0kΩ

1.8kΩ

12nF

100pF

47µF

0.01µF

PGOOD

I.C. SGND

OUT

(V) L (µH) C

(nF) R

(kΩ)R

and R

5.0 4.7 8 2.70

3.3 4.7 12 1.80

2.5 3.3 22 1.50

1.8 2.2 33 1.00

1.2 2.2 47 0.68

Select R

so that:

5kΩ ≤ R

≤ 50kΩ

Calculate R

using the equation in the

Setting the Output Voltage section.

Figure 3. Typical Operating Circuit 1 (4.5V to 28V Input Buck Converter)

Table 1. Typical Component Values for Common Output-Voltage Settings

1 2 ... 10 11 12 13 14 15 16

MAX15041 1

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics MAX15041 Manual de usuario Pagina 15

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics MAX15041