VKA75xS

The VKA75xS Series DC/DC converters present an economical and practical solution for distributed power system architectures which require high power density and efficiency while maintaining system modularity and upgradeability and whose proprietary control circuitry responds to 50-100% load steps in 100Seconds to within 1% nominal Vout. The patented fixed frequency architecture combined with surface mount technology results in a com- pact, efficient and reliable solution to DC/DC conversion requirements. With the ability to operate over a wide input voltage range of 18 to 36 and 33 to 75 volts, these modules are ideal for use in battery backup applications common in todays' telecommunication and electronic data processing applications. The output is fully isolated from the input, allowing for a variety of polarity and grounding configurations.

The features of VKA75xS can be summarized as (1)18-36 V & 33 - 75V input range; (2)high efficiency: 87% typical at 5V; (3)100S transient response 50- 100% load step; (4)420 kHz fixed-frequency operation; (5)remote sense; (6)operation to +100°C baseplate temperature; (7)primary remote on/off, choice of pos/neg logic; (8)adjustable output voltage; (9)continuout short-circuit protection; (10)thermal shutdown; (11)case ground pin; (12)UL/CUL 60950, VDE EN60950.

The absolute maximum ratings of VKA75xS are (1)voltage range VKA75LS: 18(min)/24(typ)/36(max) VDCVKA75MS: 33/48/75 VDC; (2)maximum input current VKA75LS V IN = 16VDC: 5.5 A/VKA75MS V; (3)IN= 27VDC: 3.3 A; (4)reflected ripple current peak - peak: 20 mA; (5)input ripple rejection DC to 1KHz: 50 to 60 dB; (6)no load input current LS/MS: 50/100 mA; (7)inrush charge V IN = V IN max. VKA75LS: 0.520 mC/VKA75MS: 0.360 mC; (8)quiescent operating current primary on/off disabled : 8(typ)/12(max) mA.