Product category:
Power Supply ICs and Controllers
News Release from: National Semiconductor | Subject: LM5020
Edited by the Electronicstalk Editorial
Team on 27 February 2004
High-efficiency convertor handles high
voltages
The LM5020 is a new high-voltage single-ended convertor that contains all the functions required to implement control, drive and regulation in flyback and forward power supplies.
The LM5020 is a new high-voltage single-ended convertor that contains all the functions required to implement control, drive and regulation in flyback and forward power supplies Packaged in a tiny (4 x 4mm), thermally enhanced chip-scale package, this new device integrates a 100V startup bias regulator, a current-mode PWM controller, 1.5A power mosfet driver and precision high frequency control circuitry, making it a compact and efficient solution for many power-over-Ethernet (PoE) powered device (PD) applications
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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It is also an ideal bias supply controller for 42V automotive, 36V industrial power bus and high availability distributed power systems in 48V communications equipment such as central office switches, routers and DSL access multiplexers.
"National Semiconductor's new LM5020 is yet another example of our commitment to providing optimised high-voltage power management products to our most demanding customers", said Paul Greenland, Marketing Director of the Power Management Group, National Semiconductor.
"The first combination of our 100V ABCD150XV (analogue bipolar CMOS DMOS) process technology, small footprint and the integrated 100V startup bias regulator provides the optimal solution for its targeted applications".
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National's LM5020 is offered as a high-voltage (up to 100V) single-ended convertor controller that will complement the recently launched LM5030 push-pull controller.
The high-speed LM5020 controller provides total propagation delays less than 100ns and a 1MHz capable oscillator that is programmed with a single resistor.
The level of integration and innovative technology in National's LM5020 differentiates it from competitors' products, including its: wide-range, 15-100V, startup bias regulator; high-speed, 1.5A peak power mosfet driver; user programmable line undervoltage lockout with hysteresis; and tiny 10-pin MSOP or 10-pin thermally enhanced LLP chip-scale package.
Additional features of the LM5020 include: error amplifier, precision reference, cycle-by-cycle current limit, internal slope compensation, programmable soft-start, oscillator synchronisation capability and thermal shutdown.
Customers will benefit from reduced component count, high-speed performance, elimination of the external startup regulator, power on sequencing, minimised startup surge currents and the capability to synchronise the oscillator while eliminating interference.
Shipping now, the LM5020 is housed in either a MSOP-10 or a LLP chip-scale package.
It is priced at $0.75 each in 1000-unit quantities.
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