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MAX5068CAUE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX5068CAUE Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 20 page General Description The MAX5068 is a high-frequency, current-mode, pulse-width modulation (PWM) controller that integrates all the building blocks necessary for implementing AC- DC or DC-DC fixed-frequency power supplies. Isolated or nonisolated power supplies are easily constructed using either primary- or secondary-side regulation. Current-mode control with leading-edge blanking sim- plifies control-loop design, and a programmable inter- nal slope-compensation circuit stabilizes the current loop when operating at duty cycles above 50%. The MAX5068A/B limit the maximum duty cycle to 50% for use in single-ended forward converters. The MAX5068C/D/E/F allow duty cycles up to 75%. The MAX5068 features an accurate externally programma- ble oscillator that simplifies system design. An input undervoltage lockout (UVLO) programs the input-supply startup voltage and ensures proper opera- tion during brownout conditions. A single external resistor programs the output switching frequency from 12.5kHz to 1.25MHz. The MAX5068A/ B/C/E provide a SYNC input for synchronization to an external clock. The maximum FET-driver duty cycle is 50% for the MAX5068A/B and 75% for the MAX5068C/ D/E/F. Programmable hiccup current limit provides additional protection under severe faults. The MAX5068 is specified over the -40°C to +125°C automotive temperature range and is available in a 16-pin thermally enhanced TSSOP-EP package. Refer to the MAX5069 data sheet for dual FET-driver applications. Warning: The MAX5068 is designed to work with high voltages. Exercise caution. Applications Universal-Input AC Power Supplies Isolated Telecom Power Supplies Networking System Power Supplies Server Power Supplies Industrial Power Conversion Features ♦ Current-Mode Control with 47µA (typ) Startup Current ♦ Resistor-Programmable ±4.5% Accurate Switching Frequency: 25kHz to 1.25MHz (MAX5068A/B) 12.5kHz to 625kHz (MAX5068C/D/E/F) ♦ Rectified 85VAC to 265VAC or 36VDC to 72VDC Input (MAX5068A/C/D) ♦ Input Directly Driven from 10.8V to 24V (MAX5068B/E/F) ♦ Frequency Synchronization Input (MAX5068A/B/C/E) ♦ Programmable Dead Time and Slope Compensation ♦ Programmable Startup Voltage (UVLO) ♦ Programmable UVLO Hysteresis (MAX5068A/B/D/F) ♦ Integrating Fault Protection (Hiccup) ♦ -40°C to +125°C Automotive Temperature Range ♦ 16-Pin Thermally Enhanced TSSOP-EP Package High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator ________________________________________________________________ Maxim Integrated Products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 RT REG5 IN VCC NDRV AGND PGND AGND CS TOP VIEW MAX5068A/B TSSOP-EP SYNC HYST FB DT UVLO/EN COMP FLTINT Pin Configurations Ordering Information 19-3176; Rev 1; 7/04 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. *EP = Exposed pad. PART TEMP RANGE PIN-PACKAGE MAX5068AAUE -40°C to +125°C 16 TSSOP-EP* MAX5068BAUE -40°C to +125°C 16 TSSOP-EP* MAX5068CAUE -40°C to +125°C 16 TSSOP-EP* MAX5068DAUE -40°C to +125°C 16 TSSOP-EP* MAX5068EAUE -40°C to +125°C 16 TSSOP-EP* MAX5068FAUE -40°C to +125°C 16 TSSOP-EP* Pin Configurations continued at end of data sheet. Selector Guide appears at end of data sheet. |
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