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SD14-330-R データシート(PDF) 1 Page - Cooper Bussmann, Inc. |
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SD14-330-R データシート(HTML) 1 Page - Cooper Bussmann, Inc. |
1 / 4 page Introduction/Basic Operation In switching regulator applications the inductor is used as an energy storage device. When the semiconductor switch is on the current in the inductor ramps up and energy is stored. When the switch turns off energy is released into the load. The amount of energy stored is calculated by the formula EEnneerrggyy = = ½ ½LL..II²² (Joules), where: • L is the inductance in Henrys • I is the peak value of inductor current The amount by which the current changes during a switching cycle is known as the ripple current. Ripple current is defined as V Vll = = LL..ddii//ddtt:: •Vl is the voltage across the inductor • di is the ripple current • dt is the duration for which the voltage is applied Inductor current is made up of AC and DC components (Figure 1). The AC component is high frequency and will flow through the output capacitor because it has a low HF impedance. A ripple voltage is produced due to the capacitor ‘equivalent series resistance’ (ESR) that will appear at the output of the switching regulator. This ripple voltage needs to be sufficiently low as not to effect the operation of the circuit the regulator is supplying, normally in the order of 10-500mVpk-pk. Selecting the correct ripple current impacts the size of the inductor and output capacitor. The capacitor needs to have a sufficiently high ripple current rating or it will overheat and dry out. To achieve a good compromise between inductor and capacitor size a ripple current value of 10-30% of maximum inductor current should be chosen. The current in the inductor will be continuous for output currents greater that 5-15% of full load. The following parameters need to be defined or calculated to select an inductor: • Maximum input voltage • Output voltage • Switching frequency • Maximum ripple current • Duty cycle 0 1 2 I load I inductor dI V out ESR Figure 1: Buck Inductor Inductor Selection for Switching Regulators SD3814 |
同様の部品番号 - SD14-330-R |
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同様の説明 - SD14-330-R |
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