MAX5071 データシートの表示（PDF） - Maxim Integrated

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MAX5071

High-Performance, Single-Ended, Current-Mode PWM Controllers

Maxim Integrated 

High-Performance, Single-Ended, Current-Mode

PWM Controllers

MAX5070A/MAX5070B

CS 3

GND 5

VEA

FB 2

COMP 1

2.5V

REFERENCE

2.5V

2.5V

PREREGULATOR

5V

VP

UVLO 16V/10V

THERMAL

SHUTDOWN

VOLTAGE-

DIVIDER

7 VCC

26.5V

EN-DRV-BAR

DELAY

REG_OK VP

EN-REF VDD

BG 5V REGULATOR

SNS

VOLTAGE-

DIVIDER

8 VREF

1V

ILIM

CPWM

2R

R

CLK

OSC Q

SQ

R

6 OUT

4 RT/CT

100% MAX DUTY CYCLE (MAX5070A)

50% MAX DUTY CYCLE (MAX5070B)

Figure 1. MAX5070A/MAX5070B Functional Diagram

Detailed Description

The MAX5070/MAX5071 current-mode PWM controllers

are designed for use as the control and regulation core of

flyback or forward topology switching power supplies.

These devices incorporate an integrated low-side driver,

adjustable oscillator, error amplifier (MAX5070A/

MAX5070B only), current-sense amplifier, 5V reference,

and external synchronization capability (MAX5071A/

MAX5071B only). An internal +26.5V current-limited VCC

clamp prevents overvoltage during startup.

Five different versions of the MAX5070/MAX5071 are

available. The MAX5070A/MAX5070B are the standard

versions with a feedback input (FB) and internal error

amplifier. The MAX5071A/MAX5071B include bidirection-

al synchronization (SYNC). This enables multiple

MAX5071A/MAX5071Bs to be connected and synchro-

nized to the device with the highest frequency. The

MAX5071C includes an ADV_CLK output, which pre-

cedes the MAX5071C’s drive output (OUT) by 110ns.

Figures 1, 2, and 3 show the internal functional diagrams

of the MAX5070A/MAX5070B, MAX5071A/MAX5071B,

and MAX5071C, respectively. The MAX5070A/

MAX5071A are capable of 100% maximum duty cycle.

The MAX5070B/MAX5071B/MAX5071C are designed to

limit the maximum duty cycle to 50%.

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