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MAX5095AAUA+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX5095AAUA+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 22 page Detailed Description The MAX5094_/MAX5095_ current-mode PWM con- trollers are designed for use as the control and regulation core of flyback or forward topology switching power sup- plies. These devices incorporate an integrated low-side driver, adjustable oscillator, error amplifier (MAX5094_ only), current-sense amplifier, 5V reference, and external synchronization capability (MAX5095A/MAX5095B only). An internal +26.5V current-limited VCC clamp prevents overvoltage during startup. Eight different versions of the MAX5094/MAX5095 are available as shown in the Selector Guide. The MAX5094A/MAX5094B are the standard versions with a feedback input (FB) and internal error amplifier. The MAX5095A/MAX5095B include bidirectional synchroniza- tion (SYNC). This enables multiple MAX5095A/ MAX5095Bs to be connected and synchronized to the device with the highest frequency. The MAX5095C includes an ADV_CLK output, which precedes the MAX5095C’s drive output (OUT) by 110ns. Figures 1, 2, and 3 show the internal functional diagrams of the MAX5094_, MAX5095A/MAX5095B, and MAX5095C, respectively. The MAX5094A/MAX5094C/MAX5095A are capable of 100% maximum duty cycle. The MAX5094B/ MAX5094D/MAX5095B/MAX5095C limit the maximum duty cycle to 50%. High-Performance, Single-Ended, Current-Mode PWM Controllers ______________________________________________________________________________________ 11 UVLO REFERENCE 2.5V PREREGULATOR 5V VOLTAGE- DIVIDER THERMAL SHUTDOWN EN-REF BG SNS VDD 5V REGULATOR VOLTAGE- DIVIDER 8 7 26.5V VCC REF 2.5V VP REG_OK DELAY S R Q OSC Q 4 RT/CT 6 OUT ILIM CPWM 1V (MAX5094A/B) 0.3V (MAX5094C/D) EN-DRV-BAR R 2R VEA 3 5 2 1 CS GND FB COMP CLK MAX5094_ VP 2.5V 8.4V/7.6V 100% MAX DUTY CYCLE (MAX5094A/MAX5094C) 50% MAX DUTY CYCLE (MAX5094B/MAX5094D) Figure 1. MAX5094_ Functional Diagram |
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