Power Management I Product News
Wall-mount UPS units from Powersolve offer long back-up capability
The WM Series of uninterruptible power supplies unveiled by Powersolve are wall-mount units designed to provide back-up power for long periods. Rated from 800VA/600W to 4000VA/3000W, the WM Series accepts a very wide AC input range while providing a pure sine wave output for up to several hours or more. These are line interactive UPS systems with a 3ms transfer time. They are both generator compatible and cold start capable and feature adjustable voltage transfer points and charging voltage. According to Powersolve’s Managing Director Peter Clark, WM Series units combine high power chargers with smart battery management enabling them to charge high capacity external lead acid batteries (up to 500AH) for longer hold-up times. The units provide adjustable charging currents for different batteries as well as intelligent, two-stage charge control. Powersolve can also provide units with an optional solar charger input.
The WM Series accepts a wide AC input voltage range of 140 to 310VAC for 230V models and 70 to 155VAC for the 115V version. Models in the WM Series are rated from 800VA/600W to 4000VA/3000W (230VAC output) and up to 3200VA/2400W (115VAC output). DC to AC isolation is standard. All models are protected against over current
Slimline high power density 3U 4HP pluggable PSUs from Verotec
and over charging and incorporate CPU controlled thermal protection. Every unit has a thermally controlled cooling fan. Smart monitoring and warning for battery failure or open circuit battery is included and a fully functional LED or LCD display provides users with visual systems information. Audible status alarms are also built-in. Powersolve can also supply WM Series units with a variety of communications and remote management interface options.
Powersolve |
www.powersolve.co.uk
High efficiency PoE++ PD controller provides up to 90W delivered power
Linear Technology has introduced the LT4275, LTPoE++, PoE+ and PoE-compliant powered device (PD) interface controller for applications requiring up to 90W of delivered power. The PoE+ limits the maximum PD power delivery to 25.5W, which is insufficient to power today’s more power-hungry applications, such as picocells, base stations, signage and heated outdoor cameras. The LTPoE++ Standard addresses this market by expanding the power budget to four different power levels (38.7W, 52.7W, 70W and 90W), enabling complete high power LTPoE++ systems. The LTPoE++ standard employs a classification scheme that simply enables LTPoE++ power sourcing equipment (PSE) controllers and LTPoE++ PD controllers to reliably communicate with one another while maintaining interoperability with IEEE standard equipment. The LT4275A (LTPoE++), LT4275B (PoE+) and LT4275C (PoE) efficiently deliver power to PD loads using just one IC. Unlike traditional PD controllers that integrate the power MOSFET, the LT4275 controls an external MOSFET to drastically reduce overall PD heat dissipation and maximise power efficiency, which is especially important at higher power levels.
This approach allows users to size the MOSFET to their application’s specific heating and efficiency requirements, enabling the use of low
Verotec has introduced new 3U 4HP versions of the EPLAX VeroPower family of 19 inch subrack pluggable AC/DC switched mode power supplies to add further capability to its KM6 subrack and metal enclosure families. At only 4HP (0.8 inches) wide and a standard 160mm deep, the new units are the slimmest available from any manufacturer, leaving the maximum possible space in the subrack for active system boards. The units are available with power rails that suit the requirements of many embedded computing applications. The complete VeroPower range consists of pluggable PSUs with power ratings from 20 to 150 Watt.
Output power levels of 20, 40 and 50 Watt
are available. The 20 and 40 Watt versions have 94-253VAC autoranging inputs; the 50 Watt has a 115/230VAC switchable input. The monovolt 20W unit has single voltage rail outputs: 5V/4A; 12-15V/1.4A or 24V/0.8A. Three trivolt 40W versions provide either 5V/4A, +12-15V/0.6A and -12-15V/0.6A; +12- 15V/1.4A, +12-15V/0.6A and -12-15V/0.6A or 24V/0.8A, +12-15V/1.4A and -12-15V/0.6A. The monovolt 50W unit gives 5V/10A, 12V/4.2A
RDS(ON) 30mOhm MOSFETs if necessary. The LT4275 recognizes a PSE as either Type 1 hardware complying with the IEEE 802.3af 13W power level, Type 2 hardware, complying with IEEE 802.3at 25.5W power level or LTPoE++ hardware complying with 38.7W to 90W power levels, and passes power accordingly. For efficient power allocation, PD users can configure a classification that represents the PD power usage. The LT4275 is offered in industrial and automotive grades, supporting operating temperature ranges from -40°C to 85°C and - 40°C to 125°C, respectively, and is available in small RoHS-compliant 10-pin MSOP or 3mm x 3mm DFN packages.
Linear Technology |
www.linear.com
New smartlight driver from ams integrates control of three separate banks of ‘smart’ indicator LEDs
ams AG has released the AS3661, a new smart LED driver which controls up to nine LEDs to produce sophisticated indicator lighting effects in mobile devices independent of the power- hungry baseband processor.
The device is useful for many consumer
electronics devices such as 3G and LTE modems, USB memory sticks, game controllers and headsets in which indicator lighting can enhance the user interface, and in which high-value light effects and low power consumption are required.
The device allows easy command-based
programming of all light patterns. Three independent program execution engines form three independently programmable LED banks
32 September 2012
which means that LED drivers can be grouped based on their function so that, for example, the first bank of drivers could be assigned to keypad illumination, the second bank to ‘funlights’ (patterns of light outputs produced by multiple LEDs), and the third group to notification LED(s). Each bank can contain from one to nine LED driver outputs; the AS3661 offers nine LED channels in total with up to 25mA per channel. A dedicated 12-bit PWM for each of the nine channels delivers absolutely smooth color transitions and enables the production of linear, logarithmic and ratiometric fading effects. Instructions for the program execution engines are stored in the program memory. The total capacity of the program memory is 96
Components in Electronics
ON Semi introduces integrated Li-Ion battery charger for next generation power demands
ON Semiconductor has introduced a fully programmable Lithium- Ion (Li-Ion) switching battery charger that has been optimised for power efficiency in smart phones, tablets and other handheld devices. The NCP1851 significantly reduces charge time, increases battery life and includes advanced start-up features. With 1.6 ampere (A) charging capability, the device is sized at 2.2 x 2.55 mm for the latest USB compliant input supplies and large battery capacities and can complete a full charge cycle of a 1650 milli ampere hour (mAh), 4.2 volt (V) Li- Ion battery in 90 minutes. The NCP1851 provides dynamic power path management which enables instant system turn-
on in case of a weak battery and helps replenish a deeply discharged battery. Both the device’s internal junction temperature sensor and external Negative Temperature Coefficient (NTC) thermistor ensure safe charging of the system by reporting dedicated interrupts to the i”C Control Bus. The NCP1851 provides a USB On-the-Go (OTG) mode that boosts battery voltage to power accessories plugged into the USB port, eliminating the need for another step-up converter. The NCP1851 is housed in a 25 bump Flip- Chip CSP package case with overall dimensions of a mere 2.2 mm x 2.55 mm and height of 0.6 mm maximum.
ON Semiconductor |
www.onsemi.com
instructions and the user can allocate a memory of 1.5kbit as re-quired by the engines. The AS3661 smart LED driver has an I2C-compatible
control interface with four pin-selectable addresses. The device also has a flexible General Purpose Output (GPO) which can be used as a digital control pin for other devices. The INT pin can be used to notify the central processor when a lighting sequence has ended. The device also provides a trigger input interface which allows for synchronization between multiple devices. To optimise battery lifetime the design of the AS3661 includes various power-saving features. Each channel operates on a dropout voltage of less than 50mV at 10mA powered by a high- efficiency 150mA charge pump with automatic switching between 1:1 and 1:1.5 mode. Furthermore, a power save mode is automatically entered when LED outputs are not active, resulting in a low idle mode current of 10µA (typical).
Ams |
www.ams.com www.cieonline.co.uk
- 15V/3.3A or 24VV/2.1A. All versions use the industry standard H15 connector with the pin- out following the convention established by Vero Electronics when it first developed the pluggable PSU in 1976. All outputs are highly stable, with worst case line and load regulation a maximum of 0.1% and ripple typically less than 20mVpp. Short circuit, output current limitation and output overvoltage protection are provided, and a powerfail signal is available on all 5V rails.
Verotec |
www.verotec.co.uk
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