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31 / 60 page 31/57 TSZ02201-0J1J0AL01480-1-2 © 2019 ROHM Co., Ltd. All rights reserved. 08.Apr.2020 Rev.002 www.rohm.com TSZ22111 • 15 • 001 BD9P1x5EFV-C Series Selection of Components Externally Connected - continued 1. Selection of the inductor L1 value The inductor in the switching regulator supplies a continuous current to the load and functions as a filter to smooth the output voltage. When a large inductor is selected, the Inductor ripple current ΔIL and the output voltage ripple ΔVP-P are reduced. It is the trade-off between the size and the cost of the inductor. The inductance of the inductor is shown by the following equation: ���� = (������������(������������)−����������������)×���������������� ������������(������������)×������������×∆�������� [H] Where: ������������(������������) is the input voltage (Max) [V] ���������������� is the output voltage [V] ������������ is the switching frequency [Hz] ∆�������� is the peak to peak inductor current [A] In current mode control, the sub-harmonic oscillation may happen. The slope compensation is integrated into the IC to prevent the sub-harmonic oscillation. The sub-harmonic oscillation depends on the rate of increase of output switch current. If the inductor value is too small, the sub-harmonic oscillation may happen because the inductor ripple current ΔIL is increased. If the inductor value is too large, the feedback loop may not achieve stability because the inductor ripple current ΔIL is decreased. Therefore, the recommended inductor value range for each output current is shown below. Table 2. Inductor range of each output current Output Voltage OCP_SEL Maximum Output Current Inductor Range 1.1 V to 8.5 V H 1.0 A 4.7 μH to 15 μH L 0.5 A 4.7 μH to 15 μH 0.8 V to 1.1 V H 1.0 A 10 μH to 15 μH L 0.5 A 10 μH to 15 μH If the ΔIL becomes small, the Inductor core loss (iron loss), the loss due to ESR of the output capacitor and the ΔVP-P (Output peak-to-peak ripple voltage) are also reduced. ΔVP-P is shown in the following equation. ∆��������−���� = ∆�������� × ������������ + ∆�������� 8×����������������×������������ [V] (a) Where: ������������ is the equivalent series resistance of the output capacitor [Ω] ���������������� is the output capacitance [F] ∆�������� is the peak to peak inductor current [A] ������������ is the switching frequency [Hz] Even if ΔIL is large, the ΔVP-P target is usually satisfied by using a ceramic capacitor because it has a low ESR. The advantage of this is that the inductance value can be set smaller. It also contributes to the miniaturization of the application board because when the inductance value is small, the inductor that has large rated current and is small can be selected. The disadvantages are increase of core losses in the inductor. The shielded type (closed magnetic circuit type) is the recommended type of inductor to be used. It is important not to magnetic saturate the core in any situation, so please make sure that the definition of rated current is different according to the manufactures. Please check the rated current at maximum ambient temperature of application to inductor manufacturer. |
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