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MAX17595ATE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX17595ATE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 22 page MAX17595/MAX17596/MAX17597 Peak-Current-Mode Controllers for Flyback and Boost Regulators 10 Maxim Integrated Pin Description (continued) Detailed Description The MAX17595 offers a bootstrap UVLO wake-up level of 20V with a wide hysteresis, and is optimized for imple- menting isolated and nonisolated universal (85V to 265V AC) offline single-switch flyback converter or telecom (36V to 72V) power supplies. The MAX17596/MAX17597 offer a UVLO wake-up level of 4.4V and are well-suited for low-voltage DC-DC flyback/boost power supplies. An internal 1% reference (1.21V) can be used to regulate the output in nonisolated flyback and boost applications. Additional semiregulated outputs, if needed, can be gen- erated by using additional secondary windings on the flyback converter transformer. The MAX17595/MAX17596/MAX17597 family utilizes peak-current-mode control and external compensation for optimizing closed-loop performance. The devices include cycle-by-cycle peak current limit, and eight consecutive occurrences of current-limit-event trigger hiccup mode, which protects external components by halting switching for a period of 32,768 cycles. . Input Voltage Range (VIN) The MAX17595 has no limitation on maxi- mum input voltage, as long as the external components are rated suitably and the maximum operating voltages of the MAX17595 are respected. The MAX17595 implements a rising and falling UVLO threshold that allows it to be successfully used in univer- sal input (85V to 265V AC) rectified bus applications, in rectified 3-phase DC bus applications, and in telecom (36V to 72V DC) applications. The MAX17596/MAX17597 are intended to implement flyback (isolated and nonisolated) and boost convert- ers. The VIN pin of the MAX17596/MAX17597 has a maximum operating voltage of 36V. The MAX17596/ MAX17597 implement rising and falling thresholds on the VIN pin that assume power-supply startup schemes typical of low-voltage DC-DC applications, down to an input voltage of 4.5V DC. Therefore, flyback /boost converters with a 4.5V to 36V supply voltage range can be implemented with the MAX17596/MAX17597. Internal Linear Regulator (VDRV) The internal functions and driver circuits are designed to operate from 7.4V (MAX17595) or 5V (MAX17596/ MAX17597) power-supply voltages. The MAX17595/ MAX17596/MAX17597 family has an internal linear regu- lator that is powered from the VIN pin. The output of the linear regulator is connected to the VDRV pin, and should be decoupled with a 1FF capacitor to ground for stable operation. The VDRV regulator output supplies all the oper- ating current of the MAX17595/MAX17596/MAX17597. The maximum operating voltage on the VIN pin is 29V for the MAX17595, and 36V for the MAX17596/MAX17597. PIN NAME FUNCTION 13 VDRV Linear Regulator Output and Driver Input. Connect a 1µF bypass capacitor from VDRV to SGND as close as possible to the IC. 14 VIN Internal VDRV Regulator Input. Connect VIN to the input voltage source. Bypass VIN to PGND with a 1FF minimum ceramic capacitor. 15 EN/UVLO Enable/Undervoltage Lockout. To externally program the UVLO threshold of the input supply, connect a resistive divider between input supply, EN, and SGND. 16 OVI Overvoltage Comparator Input. Connect a resistive divider between the input supply, OVI, and SGND to set the input overvoltage threshold. — EP Exposed Pad. Connect to a large ground plane through multiple vias to maximize thermal dissipation. |
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