Electronics News
Archive : 24 January 2008 год
09:11500kHz step-down DC/DC converter
Linear Technology announces the LT1912, a 2A, 36V step-down switching regulator packaged in a 3mm x 3mm DFN (or MSOP-10E). The LT1912’s 3.6V to 36V input voltage range makes it usefull for load dump and cold-crank conditions found in automotive applications. Its 3.2A internal switch can deliver up to 2A of continuous output current to voltages as low as 0.79V. Switching frequency is user-programmable from 200kHz to 500kHz. The combination of its 3mm x 3mm DFN-10 package (or thermally enhanced MSOP-10E) and tiny externals provide a compact and thermally efficient footprint.The LT1912 utilizes a 3.2A, 0.25Ohm switch, with the necessary boost diode, oscillator, control and logic circuitry integrated on-chip. Other features include external synchronization (from 250kHz to 500kHz), a power good flag and soft-start capability. The LT1912IDD and LT1912IMSE are tested and guaranteed to operate from a -40°C to 125°C operating junction temperature.
Source: www.channel-e.biz
09:103W meter shunt resistor
Vishay announced a Power Metal Strip meter shunt resistor that offers 3-W power capability in the 5515 size package, with resistance values down to 100μΩ. The WSMS5515 meter shunt resistor features a proprietary processing technique that produces resistance values from 100μΩ to 500μΩ, which provide increased accuracy in current meter shunt applications for industrial and residential electronic power meters. Featuring a 4-terminal (Kelvin) connection design, the WSMS5515 features all-welded construction and a high power-to-resistor size ratio. The resistor offers inductance values of <5nH, a thermal EMF of <3μV/°C, and an excellent frequency response to 50MHz. The device is lead (Pb)-free and RoHS-compliant. Samples and production quantities of the new meter shunt resistor are available now, with a lead time of six to eight weeks for larger orders.
Source: www.channel-e.biz