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MAX5068 Dataheets PDF



Part Number MAX5068
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description Current-Mode PWM Controller
Datasheet MAX5068 DatasheetMAX5068 Datasheet (PDF)

19-3176; Rev 1; 7/04 High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator General Description The MAX5068 is a high-frequency, current-mode, pulse-width modulation (PWM) controller that integrates all the building blocks necessary for implementing ACDC 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 simplifies con.

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19-3176; Rev 1; 7/04 High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator General Description The MAX5068 is a high-frequency, current-mode, pulse-width modulation (PWM) controller that integrates all the building blocks necessary for implementing ACDC 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 simplifies control-loop design, and a programmable internal 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 programmable oscillator that simplifies system design. An input undervoltage lockout (UVLO) programs the input-supply startup voltage and ensures proper operation 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 www.DataSheet4U.com 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. 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 MAX5068 Ordering Information PART MAX5068AAUE MAX5068BAUE MAX5068CAUE MAX5068DAUE MAX5068EAUE MAX5068FAUE *EP = Exposed pad. TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PIN-PACKAGE 16 TSSOP-EP* 16 TSSOP-EP* 16 TSSOP-EP* 16 TSSOP-EP* 16 TSSOP-EP* 16 TSSOP-EP* Applications Universal-Input AC Power Supplies Isolated Telecom Power Supplies Networking System Power Supplies Server Power Supplies Industrial Power Conversion TOP VIEW RT 1 SYNC 2 HYST 3 DT 4 UVLO/EN 5 FB 6 COMP 7 FLTINT 8 Pin Configurations 16 REG5 15 IN 14 VCC MAX5068A/B 13 NDRV 12 AGND 11 PGND 10 AGND 9 CS Selector Guide appears at end of data shee.


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