Rainbow-electronics MAX5071 Manual de usuario descargar pdf (Pagina 12)

MAX5070/MAX5071

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 MAX5070/MAX5071 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 noninverting input of the PWM com-

parator, the output of the CPWM comparator is low and

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

current-sense signal is higher than the inverting input of

the CPWM, the output of the CPWM comparator 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

VREF

2.5V

REG_OK

DELAY

OSC Q

OUT

ILIM

CPWM

EN-DRV-BAR

GND

COMP

SYNC

CLK

MAX5071A/MAX5071B

2.5V

BIDIRECTIONAL

SYNC

100% MAX DUTY CYCLE (MAX5071A)

50% MAX DUTY CYCLE (MAX5071B)

16V/10V

Figure 2. MAX5071A/MAX5071B Functional Diagram

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

MAX5070/MAX5071 1
PWM Controllers 1

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Rainbow-electronics MAX5071 Manual de usuario Pagina 12

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