Products Power Power driver New 36V, 8A step-down µModule regulator
Designed to accept an input voltage from 5V to 36V, the LTM4613 delivers a regulated output voltage from 3.3V to 15V with 2.0% maximum DC error over line, load and temperature. The converter achieves peak operating efficiencies above 95% in a 24V to 12V output.
Newly released from Laser Components (UK) Ltd. is the LDP-CW 20-50 OEM, which is a low cost device that is a com- pact and efficient current supply for out- put power up to 1kW. The capability ranges from continuous output current, to analogue modulated waveforms such as sinusoidal, rectan- gular or triangular.
Intended fields of application are laser soldering and welding as well as generic surface treatment and show lasers. The current regulation concept of the
LDP-CW 20-50, compared to the com- monly used linear regulation concept, produces considerably less losses. Hence only one supply voltage is needed for the control logic and the power stage. The current consumption drawn from the power supply only needs to cover the average laser power and is typically much less than 20A. The device features a range of benefits including: over-temperature shutdown, enable/disable input, driver status out- put and protection of the laser diode against reverse currents. Enter 222 Laser Components (UK) Ltd.
www.lasercomponents.co.uk
An 8A step-down µModule regu- lator has been introduced by Linear Technology. The device is certified by TUV Rheinland, an accredited laboratory to meet EN55022 Class B EMI (electro- magnetic interference) emissions limits at up to 96W of output.
The regulator is said to deliver the highest output power in the EN55022 Class B certified family of µModule regulators.
This performance is made pos- sible by an integrated pi-filter, meticulous layout, shielded inductor and carefully controlled
power transistor drive.
The device eliminates the need for external filters, magnetic shields and ferrite beads for a trouble-free design process. Also encapsulated within the surfacemount plastic package are the step-down controller, power transistors, inductor, compensa- tion, input filter and a modest amount of input and output capacitance levels.
A clock input pin is available to synchronise one or more of the LTM4613 regulators. Linear Technology
www.linear.com Enter 223
High-voltage PMBus system power management ICs
Two new high-voltage, system power management and protec- tion integrated circuits (ICs) have been introduced by National Semiconductor Corp., with on-chip power manage- ment bus (PMBus) support. The 48V input voltage LM5066 and -48V input voltage
New small power amplifiers
operating temperature range of -20 to 850
C.
New power amplifiers have been unveiled by Microchip; the SST12LP17E is described as the smallest fully matched power amp in its class, requiring only one DC bypass capacitor to achieve optimum performance. The SST12LP18E is a lower- cost, lower-voltage alternative to Microchip's SST12LP14E power amp and offers the lowest operat- ing voltage of any of the com- pany’s RF power amps, over an
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The devices feature operating voltages as low as 2.7V with linear output power as high as 18.5 dBm at 2.5% EVM using IEEE 802.11g OFDM 54 Mbps. For IEEE 802.11b they offer 23.5 dBm and a high power- added efficiency of up to 38%. The amps come in an 8-pin 2mm x 2mm x 0.45mm QFN package making them ideal for embedded WLAN applications where small size, high efficiency and low-battery voltage opera- tion is a required factor. These applications include consumer electronics such as cell phones, game consoles, printers and tablets. Microchip
www.microchip.com Enter 225
LM5064 integrate high-perform- ance system protection and man- agement blocks that precisely measure, control and manage the electrical operating conditions in systems such as routers, switches and base stations. The ICs enable comprehen- sive system power management for improving system reliability and reducing power consump- tion in wired and wireless tele- com infrastructure systems that operate from high-voltage system backplanes.
Ethernet routers and switches are often used along- side computing servers within
data centres, driving the need for the same accurate measure- ment and control of power flow into each card. Additionally, new wireless base stations must control and measure the power to the remote radio heads located at the top of a tower.
The ICs are highly integrated devices that meet these demands using an industry- standard PMBus interface that is software-compatible with the company’s entire family of power products. National Semiconductor
www.national.com Enter 224
PWM Controller for consumer devices
Designers of consumer electronics under 40W – such as adapters, set top boxes, net- books, and digital photo frames – all need an energy efficient solution that provides <100mW standby power in order to meet worldwide energy saving requirements. To meet this challenge, Fairchild Semi- conductor has developed the FAN6863, a highly integrated PWM controller that offers lower standby power and higher efficiency. The device is suited to space con- strained designs and offers high surge protection for increased reliability. It minimises standby power consump- tion by using a proprietary green-mode function that has off-time modulation to continuously decrease the switching fre- quency under light-load conditions. Under zero-load conditions, the power supply enters burst-mode, which shuts off the PWM output. This technology allows the device to achieve standby power of:
<100mW at no-load conditions, which enables designers to meet international power consumption requirements. The controller is packaged in a small form factor SSOT-6, is ideal for space con- strained designs while offering function- ality normally found in some of the larger device packages. It provides large gate driving capability – 400mA for up to 40W applications, surge capability up to 7KV for higher reliability, as well as an integrated internal frequency hopping function, which helps reduce EMI emissions with minimal line filters. The controller supports the technology to offer designers improved integration, ef- ficiency and packaging options that result in increased performance and reliability for better device design and end application functionality for users. Fairchild Semiconductor
www.farchildsemi.com Enter 226
JULY 2011 Electronics
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