Rainbow-electronics MAX5066 Bedienungsanleitung PDF herunterladen (Seite 14)

MAX5066

Configurable, Single-/Dual-Output, Synchronous

Buck Controller for High-Current Applications

14 ______________________________________________________________________________________

bility of these drivers provides ample drive for the fast

rise and fall times of the switching MOSFETs. Faster rise

and fall times result in reduced switching losses. For low-

output, voltage-regulating applications where the duty

cycle is less than 50%, choose high-side MOSFETs (Q2

and Q4, Figure 6) with a moderate R

DS(ON)

and a very

low gate charge. Choose low-side MOSFETs (Q1 and

Q3, Figure 6) with very low R

DS(ON)

and moderate gate

charge. The driver block also includes a logic circuit that

provides an adaptive nonoverlap time (30ns typical) to

prevent shoot-through currents during transition. Figure 7

shows the dual-phase, single-output buck regulator.

2 x f

(V/S)

RAMP

CLK

CSP_

CSN_

EN_

1.225V

CLP_

BST_

DH_

LX_

DL_

PGND

= 36

PWM

COMPARATOR

PEAK-CURRENT

COMPARATOR

52.5mV

= 500µS

Figure 3. Current Comparator and MOSFET Driver Logic

LOAD

OUT

REF

= 0.61V

EAN_

EAOUT_

Figure 4. Voltage Error Amplifier

LOAD (A)

CNTR

NO LOAD

1/2 LOAD

FULL LOAD

VOLTAGE-POSITIONING WINDOW

CNTR

+ ∆V

OUT

CNTR

- ∆V

OUT

Figure 5. Defining the Voltage-Positioning Window

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20 21 22

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