MAX5094AAUA+ Maxim Integrated Products, MAX5094AAUA+ Datasheet

MAX5094AAUA+

Manufacturer Part Number

MAX5094AAUA+

Description

IC PWM CONTROL HP 8-UMAX

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5094AAUA.pdf (22 pages)

Specifications of MAX5094AAUA+

Pwm Type

Current Mode

Number Of Outputs

Frequency - Max

1MHz

Duty Cycle

97%

Voltage - Supply

8 V ~ 25 V

Buck

Boost

Flyback

Yes

Inverting

Doubler

Divider

Yes

Cuk

Isolated

Yes

Operating Temperature

-40°C ~ 125°C

Package / Case

8-MSOP, Micro8™, 8-uMAX, 8-uSOP,

Frequency-max

1MHz

Duty Cycle (max)

97.5 %

Output Voltage

5 V

Output Current

1000 mA (Max)

Mounting Style

SMD/SMT

Switching Frequency

1000 KHz

Operating Supply Voltage

8.4 V to 26.5 V

Supply Current

3 mA

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
Download datasheet (297Kb)

The MAX5094A/B/C/D/MAX5095A/B/C 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 volt-

age and telecom power supplies.

The MAX5094/MAX5095 contain a fast comparator with

only 60ns typical delay from current sense to the output

for overcurrent protection. The MAX5094 has an inte-

grated error amplifier with the output at COMP. Soft-

start is achieved by controlling the COMP voltage rise

using external components.

The oscillator frequency is adjustable from 20kHz to

1MHz with an external resistor and capacitor. The tim-

ing capacitor discharge current is trimmed allowing for

programmable dead time and maximum duty cycle for

a given frequency. The available saw-toothed waveform

at R

needed.

The MAX5095A/MAX5095B 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 of all devices together. When synchronizing

with other devices, the MAX5095A/MAX5095B with the

highest frequency synchronizes the other devices.

Alternatively, the MAX5095A/MAX5095B can be syn-

chronized to an external clock with an open-drain out-

put stage running at a higher frequency.

The MAX5095C 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 MAX5094A/B/C are available in the 8-pin SO and

8-pin µMAX

MAX5095A/B/C are available in the 8-pin µMAX pack-

age. All devices operate over the automotive tempera-

ture range of -40°C to +125°C.

19-3864; 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

can be used for slope compensation when

packages. The MAX5094D and

________________________________________________________________ Maxim Integrated Products

General Description

Applications

♦ Pin-for-Pin Replacement for UCC28C43

♦ 2A Drive Source and 1A Sink Capability

♦ Up to 1MHz Switching Frequency Operation

♦ Bidirectional Frequency Synchronization

♦ Advanced Output Drive for Secondary-Side

♦ Fast 60ns Cycle-by-Cycle Current Limit

♦ Trimmed Oscillator Capacitor Discharge Current

♦ Accurate ±5% Start Voltage with 0.8V Hysteresis

♦ Low 32µA Startup Current

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

♦ Versions with 0.3V Current-Sense Threshold

♦ Overtemperature Shutdown

+Denotes lead-free package.

*Future product—contact factory for availability.

Ordering Information continued at end of data sheet.

MAX5094AASA+

MAX5094AAUA+

MAX5094BASA+

MAX5094BAUA+

MAX5094AASA

MAX5094AAUA*

MAX5094BASA*

MAX5094BAUA*

Pin Configurations continued at end of data sheet.

(MAX5094A) and UCC28C45 (MAX5094B)

(MAX5095A/MAX5095B)

Synchronous Rectification (MAX5095C)

Sets Maximum Duty Cycle Accurately

PART

TOP VIEW

PWM Controllers

COMP

-40°C to +125°C

TEMP RANGE

Ordering Information

MAX5094

MAX/SO

Pin Configurations

PIN-

PACKAGE

8 SO

8 µMAX

8 SO

8 µMAX

REF

OUT

GND

Features

CODE

PKG

S8-4

U8-1

S8-4

U8-1

Related parts for MAX5094AAUA+

MAX5094AAUA+ Summary of contents

Page 1

... Low 32µA Startup Current ♦ 5V Regulator Output (REF) with 20mA Capability ♦ Versions with 0.3V Current-Sense Threshold ♦ Overtemperature Shutdown PART MAX5094AASA MAX5094AASA+ MAX5094AAUA* MAX5094AAUA+ MAX5094BASA* MAX5094BASA+ MAX5094BAUA* MAX5094BAUA+ +Denotes lead-free package. *Future product—contact factory for availability. Ordering Information continued at end of data sheet. ...

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, R ...

Page 3

High-Performance, Single-Ended, Current-Mode ELECTRICAL CHARACTERISTICS (continued +15V 10k , C = 3.3nF, REF = open unless otherwise noted.) (Note 1) PARAMETER Maximum Current-Sense Signal Power-Supply Rejection Ratio Input Bias Current Delay From ...

Page 4

High-Performance, Single-Ended, Current-Mode PWM Controllers ELECTRICAL CHARACTERISTICS (continued +15V 10k , C = 3.3nF, REF = open unless otherwise noted.) (Note 1) PARAMETER SYMBOL ADV_CLK (MAX5095C Only) ADV_CLK High Voltage V ADV_CLKH ...

Page 5

High-Performance, Single-Ended, Current-Mode ELECTRICAL CHARACTERISTICS (continued +15V 10k , C = 3.3nF, REF = open unless otherwise noted.) (Note 1) PARAMETER SYMBOL CURRENT-SENSE AMPLIFIER Gain (Notes 3, 4) Maximum Current-Sense Signal Power-Supply ...

Page 6

Page 7

High-Performance, Single-Ended, Current-Mode (V = 15V +25°C, unless otherwise noted REFERENCE VOLTAGE vs. TEMPERATURE 5.08 5.06 5.04 5. 1mA 5.00 REF 4. 20mA REF 4.96 4.94 4.92 4.90 -40 -25 -10 5 ...

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 T 100 C = 560pF 220pF 100pF T 10 ...

Page 9

High-Performance, Single-Ended, Current-Mode (V = 15V +25°C, unless otherwise noted OUT SOURCE AND SINK CURRENTS MAX5094/95 toc20 V = 15V 10nF OUT V OUT 10V/div I OUT 4A/div t = 400ns/div MAX5094_ PIN ...

Page 10

High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5095_ PIN NAME MAX5095A/ MAX5095C MAX5095B 1 1 COMP 2 — SYNC — 2 ADV_CLK GND 6 6 OUT ...

Page 11

High-Performance, Single-Ended, Current-Mode MAX5094_ 1V (MAX5094A/B) 0.3V (MAX5094C/ GND 5 VEA FB 2 COMP 1 Figure 1. MAX5094_ Functional Diagram Detailed Description The MAX5094_/MAX5095_ current-mode PWM con- trollers are designed for use as the control and regulation core ...

Page 12

High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5095A MAX5095B CS 3 GND 5 COMP 1 BIDIRECTIONAL SYNC 2 SYNC Figure 2. MAX5095A/B Functional Diagram Current-Mode Control Loop The advantages of current-mode control over voltage- mode control are twofold. First, there is the ...

Page 13

High-Performance, Single-Ended, Current-Mode MAX5095C CS 3 GND 5 COMP 1 ADV_CLK 2 Figure 3. MAX5095C 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 HYST where the MAX5094/MAX5095s’ maximum internal sup- CC ...

Page 15

High-Performance, Single-Ended, Current-Mode MAX5095_Feedback The MAX5095A/MAX5095B/MAX5095C use either an external error amplifier when designed into a nonisolat- ed converter or an error amplifier and optocoupler when designed into an isolated power supply. The COMP input is level-shifted and connected to ...

Page 16

High-Performance, Single-Ended, Current-Mode PWM Controllers OUT t ADV_CLK ADV_CLK t PULSE Figure 4. ADV_CLK Figure 5. MAX5094_ Typical Application Circuit (Isolated Flyback with Primary-Side Regulation) 16 ______________________________________________________________________________________ Advance ...

Page 17

High-Performance, Single-Ended, Current-Mode Figure 6. MAX5094_ Typical Application Circuit (Nonisolated Flyback SYNC INPUT/OUTPUT R SYNC Figure 7. MAX5095A/MAX5095B Typical Application Circuit (Isolated ...

Page 18

High-Performance, Single-Ended, Current-Mode PWM Controllers REF OUT R T MAX5095C COMP ADV_CLK GND 0.5V/ s PULSE TRANSFORMER Figure 8. MAX5095C Typical Application Circuit (Isolated Forward ...

Page 19

High-Performance, Single-Ended, Current-Mode REF OUT R T MAX5095A MAX5095B SYNC GND Figure 9. Synchronization of MAX5095A/MAX5095B ______________________________________________________________________________________ REF OUT R T MAX5095A MAX5095B R ...

Page 20

High-Performance, Single-Ended, Current-Mode PWM Controllers PART FEATURE MAX5094AASA Feedback MAX5094AAUA Feedback MAX5094BASA Feedback MAX5094BAUA Feedback MAX5094CASA Feedback MAX5094CAUA Feedback MAX5094DAUA Feedback MAX5095AAUA Sync MAX5095BAUA Sync MAX5095CAUA ADV_CLK TOP VIEW COMP 1 SYNC 2 MAX5095A MAX5095B ...

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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