Rainbow-electronics MAX8720 Manual do Utilizador descarregar pdf (Página 14)

MAX8720

On-times translate only roughly to switching frequen-

cies. The on-times guaranteed in the Electrical

Characteristics table are influenced by switching delays

in the external high-side MOSFET. Resistive losses,

including the inductor, both MOSFETs, output-capacitor

ESR, and PC board copper losses in the output and

ground tend to raise the switching frequency at higher

output currents. Also, the dead-time effect increases the

effective on-time, reducing the switching frequency. It

occurs only in PWM mode (SKIP = high) and during

Dynamically Adjustable 6-Bit VID

Step-Down Controller

14 ______________________________________________________________________________________

REF

-15%

FROM

D/A

REF

SKIP SUS S0, S1 D0–D5 TIME

10kΩ

ERROR

AMP

TOFF

TON

REF

+15%

R-2R

D/A CONVERTER

CHIP SUPPLY

GNDS

FBS

PGOOD

ON-TIME

COMPUTE

TON

ONE-SHOT

TRIG

BATT

2V TO 28V

TRIG

REF

PGND

+5V

OUT

ZERO CROSSING

CURRENT

LIMIT

BST

ILIM

REF

+5V

OVP/UVP

DETECT

SHDN

TON

V+

70kΩ

MAX8720

MUX AND SLEW CONTROL

AGND

Figure 2. MAX8720 Block Diagram

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 30 31

Step-Down Controller 1

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