Controllers streamline telecomms supplies

The NCP1030 and NCP1031 are miniature high-voltage monolithic switching regulators that feature both a power switch and a startup circuit.

The NCP1030 and NCP1031 are miniature high-voltage monolithic switching regulators that feature both a power switch and a startup circuit.

The new NCP103x family of devices simplify the generation of low power and secondary side bias supply voltages that are often required by DC/DC convertors and/or 48V telecomms systems by mitigating both the space and component-selection issues that have traditionally plagued designers.

In addition, the devices are ideal for emerging applications such as 42V automotive systems and "power over Ethernet" (POE) devices such as IP phones and wireless access points.

The NCP1030 and NCP1031 are integrated solutions that combine a PWM controller, an efficient high-voltage startup circuit, a high-voltage power switch, and housekeeping and protection functions into a space-saving SO8 or Micro8 package.

Because the devices reduce external component count, system costs, assembly time and board space are all significantly minimised.

An optimised gate drive for the internal power switch reduces electromagnetic interference (EMI).

The on-chip startup regulator further reduces external component count and can be disabled to reduce power consumption.

An internal current limit with adaptive leading edge blanking (LEB) eliminates the need for external sensing components.

Individual line under- and overvoltage (UV/OV) detectors ease transformer design.

An internal error amplifier is configurable for either isolated or nonisolated applications.

Programmable operating frequency up to 1MHz allows for the reduction of the size of magnetic components.

External frequency synchronisation facilitates system integration.

"The introduction of the NCP103x family of devices renders discrete power supply designs for 48V telecomms applications virtually obsolete", said Jeff Olsen, ON Semiconductor Marketing Director for Power Supply Products.

"With the implementation of the NCP1030, a single 3.0 x 4.9mm footprint device replaces a cumbersome system design that required a PWM controller, a 200V mosfet in a large power package as the main power switch, a 200V startup mosfet, a supervisory circuit and up to 12 other components".

The NCP1030 is offered in a Micro8 package and priced at $1 per unit in 10,000 unit quantities.

The NCP1031 is offered in an SO8 package and priced at $1.15 per unit in 10,000 unit quantities.

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