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FP80 Datasheet(PDF) 3 Page - Power-One |
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FP80 Datasheet(HTML) 3 Page - Power-One |
3 / 5 page Accessories Filter & Ring Core Chokes FP, L and LP Series REV. SEP 29, 2003 Page 3 of 5 Typical Application The example in figure Reduction of voltage interference by FP filters shows a switching regulator operating from a bat- tery ( Ri < 0.5 Ω) with long supply lines (e.g. 2 m).The result- ing superimposed interference voltage USL may be meas- ured at the regulators input. The connection of a filter in front of the power supply will reduce this interference ac- cordingly: 1. The regulator's source impedance is mainly inductive because of the low battery impedance and the long sup- ply lines. It can be calculated as follows: l ZLine l ≅ 2 π • fS • LLine • 2 l l ZLine l ≅ 2 π • (150 • 103) • 10-6 • 2 • 2 ≅ 3.8 Ω fS: Switching frequency (150 kHz) LLine : Supply line inductance (typically 1µH/m) l : Length of single supply line (twice for posi- tive and negative path) Fig. 3 Reduction of voltage interference by FP filters Vi+ Gi– Vo+ Go– PSR RL Uo U Filter Uio Uii Gi Us 2 • l ZLine 12011 2. This example shows, that with an inductive source im- pedance of 3.8 Ω, the insertion of the filter results in an interference voltage reduction of approx. 18 dB (see fig.: Interference voltage reduction with FP filters at f = 150 kHz). 3. The original superimposed interference voltage will be reduced by a factor of approx. 8: USF = USL • 10–18/20 [V] Electrical Data Ring Core Chokes General Condition: TA = 25°C unless otherwise specified Table 3: Ring core chokes Characteristics Conditions L20-7/LP 20-7 LP34-3 LP183 min typ max min typ max min typ max Unit ILn Rated current 1 L = 0.75 Lo 7 3 8 A DC RL Ohmic resistance 5 5.5 6 18 20 22 2 ×2.9 2×4.2 2×5.5 mý Lo No load inductance IL = 0, TC min...TC max 18 20 22 30 34 38 2 ×95 2×183 2×245 µH DTI Current specific case 0.082 0.68 0.19 K/A2 temp. increase 1 TA Amb. temperature 1 IL = ILn –40 106 –40 104 –40 98 °C TC Case temperature –40 110 –40 110 –40 110 TS Storage temperature –40 110 –40 110 –40 110 1 If the choke is not operating at the rated current ILn, the maximum ambient temperature TA max and the maximum direct current IL max change according to the following equations: IL max = TC max –TA max TA max = TC max – IL2 max • DTI DTI Low-Loss Ring Core Chokes L/LP-Series The ring core chokes, in combination with a capacitor, may easily be used for application specific LC filters at the input or output of switched mode power supplies. All chokes are suitable for PCB mounting. They are either moulded into plastic cases or isolated from the PCB by means of an iso- lation pad. Series L/LP20-7 and LP34-3 are intended for use as differ- ential mode filters and the current compensated choke LP183 enables attenuation of common mode interference. 80 60 40 0 20 02 6 412 8 10 14 100 7 3 75 LP34-3 LP183 L/LP20-7 12012 L /Lo [%] IL [A] Fig. 4 Choke inductance versus current |
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