34 storage chokes nominal current: 0.45 - 6.3 a @ j j j j j a 70c nominal inductance: 11 - 3700 h/ tol. 15% max. working voltage: 600 vdc application range: up to 1 mhz isolation voltage: 2 kv eff. / wdg.-ambient climatic category: 40/125/21 acc. to iec 60068-1 plastic case: ul 94 v-0 potting resin: ul 94 v-0 dsf storage chokes are used as energy stores in switch mode power supplies. principle features: - reduced magnetic reversal - constant inductance at high alternating field modulation and high dc magnetisation. environmental ratings: the dsf chokes can only be used with high frequency alternating current or with hf-modulated direct current up to 1 mhz, under consideration of their self heating (i n and d i at f 0 ) and of the ambi- ent temperature ( j a). this range of chokes enables horizontal mounting, thus reducing the height of mounted circuit. finest quality core materials allow the highest electrical performance with minimum component volume. good design with easy assembly allows good cost/performance ra- tio. this type of choke is essential in the field of power electronics, e.g. switching power supplies, chopper amplifiers, dc drives and stepper motor controls. dsf series, flat housing typical ambient temperature j a = 70c operating frequency f 0 = 50 khz nominal dc current i n = as per table hf-ripple d i = 20% i n smd-version upon request. technical data type i n (1) l n (2) r cu (3) ~ f res case [a] [h] [m w ] [mhz] dsf1-18-0.6-500/a 0.6 500 360 2.5 04-1 dsf1-18-1.2-125/a 1.2 125 90 6.5 04-1 dsf1-18-2.0-45/a 2.0 45 32 12 04-1 dsf1-18-4.0-11/a 4.0 1 1 8 32 04-1 dsf1-28-0.45-3700/a 0.45 3700 1900 0.6 15-1 dsf1-28-0.63-1800/a 0.63 1800 900 1 15-1 dsf1-28-1.0-750/a 1.0 750 360 1.8 15-1 dsf1-28-1.8-230/a 1.8 230 125 3.5 15-1 dsf1-28-3.15-75/a 3.15 75 45 7 15-1 dsf1-28-4.5-37/a 4.5 37 20 10 15-1 dsf1-28-6.3-18/a 6.3 18 10 18 15-1 (1) @ j a 70c; current derating over 70c: i = i n x (125- j a)/55 (2) nominal inductance measured according to en 138100, see introduction of this catalog, paragraph 3.4 (3) resistance @ j a 25c application typical curve case 04-1 case 15-1
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