Rainbow-electronics MAX5095A Manual do Utilizador descarregar pdf (Página 12)

MAX5094A/B/C/D/MAX5095A/B/C

Current-Mode Control Loop

The advantages of current-mode control over voltage-

mode control are twofold. First, there is the feed-forward

characteristic brought on by the controller’s ability to

adjust for variations in the input voltage on a cycle-by-

cycle basis. Secondly, the stability requirements of the

current-mode controller are reduced to that of a single-

pole system unlike the double pole in the voltage-mode

control scheme.

The MAX5094/MAX5095 use a current-mode control loop

where the output of the error amplifier is compared to the

current-sense voltage (V

). When the current-sense sig-

nal is lower than the inverting input of the CPWM com-

parator, the output of the comparator is low and the

switch is turned on at each clock pulse. When the cur-

rent-sense signal is higher than the inverting input of the

CPWM comparator, the output is high and the switch is

turned off.

High-Performance, Single-Ended, Current-Mode

PWM Controllers

12 ______________________________________________________________________________________

UVLO

REFERENCE

2.5V

PREREGULATOR

VOLTAGE-

DIVIDER

THERMAL

SHUTDOWN

EN-REF

SNS

5V REGULATOR

VOLTAGE-

DIVIDER

26.5V

REF

2.5V

REG_OK

DELAY

OSC Q

OUT

ILIM

CPWM

0.3V

EN-DRV-BAR

GND

COMP

SYNC

CLK

MAX5095A

MAX5095B

2.5V

BIDIRECTIONAL

SYNC

100% MAX DUTY CYCLE (MAX5095A)

50% MAX DUTY CYCLE (MAX5095B)

8.4V/7.6V

Figure 2. MAX5095A/B Functional Diagram

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 21 22

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