Rainbow-electronics MAX1637 Uživatelský manuál stáhnout pdf (Strana 10)

MAX1637

Miniature, Low-Voltage,

Precision Step-Down Controller

10 ______________________________________________________________________________________

PWM Controller Block

The heart of the current-mode PWM controller is a

multi-input, open-loop comparator that sums four sig-

nals: the output voltage error signal with respect to

the reference voltage, the current-sense signal, the

integrated voltage-feedback signal, and the slope-

compensation ramp (Figure 3). The PWM controller is

a direct-summing type, lacking a traditional error

amplifier and the phase shift associated with it. This

direct-summing configuration approaches ideal

cycle-by-cycle control over the output voltage.

SHOOT-

THROUGH

CONTROL

30mV

R Q

LEVEL

SHIFT

OSC

LEVEL

SHIFT

REF

CURRENT

LIMIT

SYNCHRONOUS

RECTIFIER CONTROL

SHDN

-100mV

CSH

CSL

REF

BST

PGND

SLOPE

COMPENSATION

SKIP

COUNTER

DAC

SOFT-START

Figure 3. PWM Controller Functional Diagram

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

Miniature, Low-Voltage 1

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