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1、MAX5094CGeneral DescriptionThe 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 p
2、ower 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 com
3、ponents.The oscillator frequency is adjustable from 20kH z 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 T C T can be used f
4、or slope compensation when 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
5、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
6、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 MAX ?packages. The MAX5094D and MAX5095A/B/C are available in the 8-pin MAX pack-age. All devices operate over the aut
7、omotive tempera-ture range of -40C to +125C.ApplicationsUniversal Input AC/DC Power Supplies Isolated Telecom Power Supplies Isolated Power-Supply Modules Networking SystemsComputer Systems/Servers Industrial Power Conversion Isolated Keep-Alive CircuitsFeatures?Pin-for-Pin Replacement for UCC28C43(
8、MAX5094A) and UCC28C45 (MAX5094B)?2A Drive Source and 1A Sink Capability ?Up to 1MHz Switching Frequency Operation ?Bidirectional Frequency Synchronization (MAX5095A/MAX5095B)?Advanced Output Drive for Secondary-Side Synchronous Rectification (MAX5095C)?Fast 60ns Cycle-by-Cycle Current Limit?Trimmed
9、 Oscillator Capacitor Discharge Current Sets Maximum Duty Cycle Accurately ?Accurate 5% Start Voltage with 0.8V Hysteresis ?Low 32A Startup Current?5V Regulator Output (REF) with 20mA Capability ?Versions with 0.3V Current-Sense Threshold ?Overtemperature ShutdownMAX5094A/B/C/D/MAX5095A/B/CHigh-Perf
10、ormance, Single-Ended, Current-ModePWM Controllers_Maxim Integrated Products119-3864; Rev 3; 10/06For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxims website at http:/ is a registered trademark of Maxim Integrated Products, Inc.M A X
11、5094A /B /C /D /M A X 5095A /B /CHigh-Performance, Single-Ended, Current-Mode PWM ControllersABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operati
12、on of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC (Low-Impedance Source) to GND.-0.3V to +30V V CC (I CC Con
13、tinuous Power Dissipation (T A = +70C)8-Pin MAX (derate 4.5mW/C above +70C).362mW 8-Pin SO (derate 5.9mW/C above +70C).470.6mW Operating Temperature Range .-40C to +125C Maximum Junction Temperature.+150C Storage Temperature Range.-65C to +150C Lead Temperature (soldering, 10s).+300CMAX5094A/B/C/D/M
14、AX5095A/B/CHigh-Performance, Single-Ended, Current-ModePWM ControllersELECTRICAL CHARACTERISTICS (continued)(V = +15V, R = 10k ?, C = 3.3nF, REF = open, C = 0.1F, COMP = open, V = 2V, CS = GND, T = T = -40C to +85C ,M A X 5094A /B /C /D /M A X 5095A /B /CHigh-Performance, Single-Ended, Current-Mode
15、PWM ControllersELECTRICAL CHARACTERISTICS (continued)(V CC = +15V, R T = 10k ?, C T = 3.3nF, REF = open, C REF = 0.1F, COMP = open, V FB = 2V, CS = GND, T A = T J = -40C to +85C ,unless otherwise noted.) (Note 1)ELECTRICAL CHARACTERISTICS(V = +15V, R = 10k ?, C = 3.3nF, REF = open, C = 0.1F, COMP = open, V = 2V, CS = GND, T = T = -40C to +125C ,MAX5094A/B/C/D/MAX5095A/B/CHigh-Performance, Single-Ended,
