ON Semiconductor Introduces Highly Integrated, Voltage Mode PWM Controller for Isolated DC-DC Power Conversion
PHOENIX--Feb. 21, 2003--Continuing its commitment to deliver high-performance power management devices, ON Semiconductor today introduced the NCP1560 -- a voltage-mode Pulse Width Modulation (PWM) dc-dc controller for use in telecom power converters, control driven synchronous rectification power converters, high voltage power modules, and 42-Volt (V) automotive systems.
"The NCP1560 combines all the necessary features required in high-density isolated dc-dc modules and on-board designs for telecom and automotive applications," said Andy Williams, director of Power Conversion Products. "No other controller available on the market offers this level of feature integration and performance."
The NCP1560 enables highly efficient, isolated dc-dc conversion with minimal external components. It features several functions not found in competitive parts that help simplify design process and reduce system cost. For example, the NCP1560 is designed with a control output for the main switch and a second output that can control a synchronous rectifier, an active clamp, or a reset switch. Additionally, the dual control outputs have adjustable overlap delays that prevent simultaneous conduction and facilitate soft switching within various circuit topologies. Because the device features a high voltage (21.5 V to 150 V) start-up regulator, fewer external components are required in the system. After initial start-up, this regulator is disabled to reduce power consumption.
Yet another advantage the NCP1560 offers designers is a voltage mode operation with fast line feed-forward which delivers better regulation with line changes without some of the traditional problems associated with current mode control.
More Features
An extensive set of protection features provided by the NCP1560 eliminates the need for external supervisory functions. Dual mode, over-current protection handles momentary overload and hard-short conditions differently for the best tradeoff in performance and safety. The converter enters a cycle-by-cycle current limit mode if an overload condition is detected. If a hard-short condition is detected, the converter enters the cycle skip mode, during which the converter is disabled for a time period determined by the external cycle skip capacitor. This reduces power dissipation and system stress. An internal line under/over voltage detector disables the controller if the line voltage is outside the selected operating range.
The NCP1560 oscillator frequency is selected using an external resistor. The traditional timing capacitor is incorporated internally to improve noise susceptibility and reduce external components. A trimmed oscillator frequency together with an accurate programmable maximum duty cycle facilitates magnetic design. A maximum oscillator frequency up to 500 kilohertz (kHz) allows the designer to benefit from smaller size magnetic components.
The NCP1560 is offered in an SO-16 package and priced at $1.35 per unit in 10,000 unit quantities. For more information, visit www.onsemi.com/tech.
About ON Semiconductor
ON Semiconductor offers an extensive portfolio of power- and data-management semiconductors and standard semiconductor components that address the design needs of today's sophisticated electronic products, appliances and automobiles. For more information, visit ON Semiconductor's Web site at http://www.onsemi.com.
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