MAX5070BASA+ Maxim Integrated Products, MAX5070BASA+ Datasheet

MAX5070BASA+

Manufacturer Part Number

MAX5070BASA+

Description

IC PWM CONTROL HP 8-SOIC

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5070BAUA.pdf (22 pages)

Specifications of MAX5070BASA+

Pwm Type

Current Mode

Number Of Outputs

Frequency - Max

1MHz

Duty Cycle

50%

Voltage - Supply

10.8 V ~ 25 V

Buck

Boost

Flyback

Yes

Inverting

Doubler

Divider

Yes

Cuk

Isolated

Yes

Operating Temperature

-40°C ~ 125°C

Package / Case

8-SOIC (3.9mm Width)

Frequency-max

1MHz

Duty Cycle (max)

50 %

Output Voltage

5 V

Output Current

2000 mA

Mounting Style

SMD/SMT

Switching Frequency

1000 KHz

Operating Supply Voltage

11 V to 26.5 V

Supply Current

32 uA

Maximum Operating Temperature

+ 125 C

Fall Time

22 ns

Minimum Operating Temperature

- 40 C

Rise Time

15 ns

Synchronous Pin

Topology

Flyback or Forward or Push-Pull

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 22
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The MAX5070/MAX5071 BiCMOS, high-performance,

current-mode PWM controllers have all the features

required for wide input voltage range isolated/nonisolated

power supplies. These controllers are used for low- and

high-power universal input voltage and telecom power

supplies.

The MAX5070/MAX5071 contain a fast comparator with

only 60ns typical delay from current sense to the output

for overcurrent protection. The MAX5070A/MAX5070B

have an integrated error amplifier with the output at

COMP. Soft-start is achieved by controlling the COMP

voltage rise using external components.

The frequency is adjustable from 20kHz to 1MHz with

an external resistor and capacitor. The timing capacitor

discharge current is trimmed allowing for programma-

ble dead time and maximum duty cycle for a given fre-

quency. The available saw-toothed waveform at R

can be used for slope compensation when needed.

The MAX5071A/MAX5071B include a bidirectional syn-

chronization circuit allowing for multiple controllers to

run at the same frequency to avoid beat frequencies.

Synchronization is accomplished by simply connecting

the SYNC pins of all devices together. When synchro-

nizing with other devices, the MAX5071A/MAX5071B

with the highest frequency synchronizes the other

devices. Alternatively, the MAX5071A/MAX5071B can

be synchronized to an external clock with an open-

drain output stage running at a higher frequency.

The MAX5071C provides a clock output pulse

(ADV_CLK) that leads the driver output (OUT) by

110ns. The advanced clock signal is used to drive the

secondary-side synchronous rectifiers.

The MAX5070/MAX5071 are available in 8-pin µMAX

and SO packages and operate over the automotive tem-

perature range of -40°C to +125°C.

19-3283; Rev 3; 10/06

µMAX is a registered trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

High-Performance, Single-Ended, Current-Mode

Universal Input AC/DC Power Supplies

Isolated Telecom Power Supplies

Isolated Power-Supply Modules

Networking Systems

Computer Systems/Servers

Industrial Power Conversion

Isolated Keep-Alive Circuits

________________________________________________________________ Maxim Integrated Products

General Description

Applications

♦ Pin-for-Pin Replacement for UC2842 (MAX5070A)

♦ 2A Drive Source and 1A Sink Capability

♦ Up to 1MHz Switching Frequency Operation

♦ Bidirectional Synchronization

♦ Advanced Output Drive for Secondary-Side

♦ Fast 60ns Cycle-by-Cycle Current Limit

♦ Trimmed Oscillator Capacitor Discharge Current

♦ Accurate 5% Start and Stop Voltage with 6V

♦ Low 32µA Startup Current

♦ 5V Regulator Output (VREF) with 20mA Capability

♦ Overtemperature Shutdown

Ordering Information continued at end of data sheet.

Selector Guide appears at end of data sheet.

Specify lead-free by adding the + symbol at the end of the part

number when ordering.

MAX5070AASA

MAX5070AAUA

MAX5070BASA

MAX5070BAUA

Pin Configurations continued at end of data sheet.

and UC2844 (MAX5070B)

(MAX5071A/MAX5071B)

Synchronous Rectification (MAX5071C)

Sets Maximum Duty Cycle Accurately

Hysteresis

TOP VIEW

PART

COMP

PWM Controllers

-40°C to +125°C

Ordering Information

TEMP RANGE

µMAX/SO

MAX5070A

MAX5070B

Pin Configurations

VREF

OUT

GND

PIN-PACKAGE

8 SO

8 µMAX

8 SO

8 µMAX

Features

Related parts for MAX5070BASA+

MAX5070BASA+ Summary of contents

Page 1

... Networking Systems Computer Systems/Servers Industrial Power Conversion Isolated Keep-Alive Circuits µMAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ♦ Pin-for-Pin Replacement for UC2842 (MAX5070A) and UC2844 (MAX5070B) ♦ ...

Page 2

High-Performance, Single-Ended, Current-Mode PWM Controllers ABSOLUTE MAXIMUM RATINGS V (Low-Impedance Source) to GND ..................-0.3V to +30V < 30mA).....................................................Self Limiting CC CC OUT to GND ...............................................-0. OUT Current.............................................................±1A for 10µs FB, SYNC, COMP, CS ...

Page 3

High-Performance, Single-Ended, Current-Mode ELECTRICAL CHARACTERISTICS (continued +15V 10kΩ 3.3nF unless otherwise noted.) (Note 1) PARAMETER Power-Supply Rejection Ratio Input Bias Current Delay From CS to OUT t MOSFET DRIVER OUT ...

Page 4

High-Performance, Single-Ended, Current-Mode PWM Controllers ELECTRICAL CHARACTERISTICS (continued +15V 10kΩ 3.3nF VREF unless otherwise noted.) (Note 1) PARAMETER SYMBOL ADV_CLK (MAX5071C only) ADV_CLK High Voltage V ADV_CLKH ADV_CLK Low Voltage ...

Page 5

High-Performance, Single-Ended, Current-Mode ELECTRICAL CHARACTERISTICS (continued +15V 10kΩ 3.3nF unless otherwise noted.) (Note 1) PARAMETER SYMBOL CURRENT-SENSE AMPLIFIER Gain Maximum Current-Sense Signal V Power-Supply Rejection Ratio Input Bias Current Delay ...

Page 6

High-Performance, Single-Ended, Current-Mode PWM Controllers ELECTRICAL CHARACTERISTICS (continued +15V 10kΩ 3.3nF VREF unless otherwise noted.) (Note 1) PARAMETER SYMBOL SYNC Leakage Current ADV_CLK (MAX5071C only) ADV_CLK High Voltage V ADV_CLKH ...

Page 7

High-Performance, Single-Ended, Current-Mode (V = 15V +25°C, unless otherwise noted REFERENCE VOLTAGE (VREF) vs. TEMPERATURE 5.5 5.4 5.3 5 1mA 5.1 REF 5.0 4 20mA REF 4.8 4.7 4.6 4.5 -40 -25 ...

Page 8

High-Performance, Single-Ended, Current-Mode PWM Controllers (V = 15V +25°C, unless otherwise noted TIMING RESISTANCE ( vs. OSCILLATOR FREQUENCY 1000 C = 1nF 560pF 100 220pF ...

Page 9

High-Performance, Single-Ended, Current-Mode (V = 15V +25°C, unless otherwise noted OUT SOURCE AND SINK CURRENTS MAX5070 toc20 V = 15V 10nF OUT V OUT 10V/div I OUT 2A/div 20Ons/div MAX5070A/MAX5070B PIN NAME 1 ...

Page 10

High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5071A/MAX5071B/MAX5071C PIN NAME MAX5071A/ MAX5071C MAX5071B 1 1 COMP 2 — SYNC — 2 ADV_CLK GND 6 6 OUT ...

Page 11

High-Performance, Single-Ended, Current-Mode MAX5070A/MAX5070B CS 3 GND 5 VEA FB 2 COMP 1 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 ...

Page 12

High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5071A/MAX5071B CS 3 GND 5 COMP 1 BIDIRECTIONAL SYNC 2 SYNC Figure 2. MAX5071A/MAX5071B Functional Diagram Current-Mode Control Loop The advantages of current-mode control over voltage- mode control are twofold. First, there is the feed-forward ...

Page 13

High-Performance, Single-Ended, Current-Mode MAX5071C CS 3 GND 5 COMP 1 ADV_CLK 2 Figure 3. MAX5071C Functional Diagram In normal operation derived from a tertiary wind- CC ing of the transformer. However, at startup there is no energy delivered ...

Page 14

High-Performance, Single-Ended, Current-Mode PWM Controllers To calculate the capacitance required, use the following formula: ⎡ ⎛ V − INMIN − ⎢ ⎜ R ⎝ ⎢ ST ⎣ HYST where ...

Page 15

High-Performance, Single-Ended, Current-Mode MAX5071A/MAX5071B/MAX5071C The MAX5071A/MAX5071B/MAX5071C are designed to be used with either an external error amplifier when designed into a nonisolated converter or an error ampli- fier and optocoupler when designed into an isolated power supply. The COMP input ...

Page 16

High-Performance, Single-Ended, Current-Mode PWM Controllers OUT t ADV_CLK ADV_CLK t PULSE Figure 4. ADV_CLK Figure 5. MAX5070A/MAX5070B Typical Application Circuit (Isolated Flyback with Primary-Side ...

Page 17

High-Performance, Single-Ended, Current-Mode Figure 6. MAX5070A/MAX5070B Typical Application Circuit (Non-Isolated Flyback SYNC INPUT/OUTPUT R SYNC Figure 7. MAX5071A/MAX5071B Typical Application Circuit (Isolated Flyback) ______________________________________________________________________________________ Typical Application ...

Page 18

High-Performance, Single-Ended, Current-Mode PWM Controllers VREF OUT R T MAX5071C COMP ADV_CLK GND 0.5V/µs PULSE TRANSFORMER Figure 8. MAX5071C Typical Application Circuit (Isolated Forward with ...

Page 19

High-Performance, Single-Ended, Current-Mode VREF OUT R T MAX5071A MAX5071B SYNC GND Figure 9. Synchronization of MAX5071s ______________________________________________________________________________________ VREF OUT R T MAX5071A MAX5071B R ...

Page 20

High-Performance, Single-Ended, Current-Mode PWM Controllers FEEDBACK/ PART ADVANCED CLOCK MAX5070AASA Feedback MAX5070AAUA Feedback MAX5070BASA Feedback MAX5070BAUA Feedback MAX5071AASA Sync. MAX5071AAUA Sync. MAX5071BASA Sync. MAX5071BAUA Sync. MAX5071CASA ADV_CLK MAX5071CAUA ADV_CLK TOP VIEW COMP 1 SYNC ...

Page 21

High-Performance, Single-Ended, Current-Mode (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages TOP VIEW FRONT VIEW ______________________________________________________________________________________ ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Package Information (continued) ...

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