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BD86852MUF-C Scheda tecnica(PDF) 27 Page - Rohm |
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BD86852MUF-C Scheda tecnica(HTML) 27 Page - Rohm |
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27 / 46 page  27/43 TSZ02201-0A3A0AP00520-1-2 © 2020 ROHM Co., Ltd. All rights reserved. 03.Mar.2020 Rev.001 www.rohm.com TSZ22111 • 15 • 001 BD86852MUF-C 2. Selection of Components Externally Connected – continued 2.3 Selection of the Output Capacitor C5 A ceramic capacitor is needed for the internal regulator VREG pin. Moreover, in order to maintain good temperature characteristics, the one with the X7R characteristic or better is recommended. The voltage rating is recommended to 3 times or more the output voltage. Refer to "Circuit Example" for the recommended output capacitor. 2.4 Selection of Input Capacitor CIN (CIN0, CIN1, CIN23) The input capacitor is usually required for two types of decoupling capacitors, the CIN and the bulk capacitors. Ceramic capacitors are effective by being placed as close as possible to the VCC (PVCC, VS2 and VS3) pin and the GND (PGND1 and PGND23) pin. Voltage rating is recommended to 1.2 times or more the maximum input voltage. Refer to "Circuit Example" for the recommended input capacitors. Also, the IC might not function properly when the PCB layout or the position of the capacitor is not good. Refer to “Caution on PCB Layout”. The bulk capacitor is an option. The bulk capacitor prevents the decrease in the line voltage and serves a backup power supply to keep the input potential constant. The RMS value of the input ripple electric current is obtained in the following equation. In that case, consider not to exceed the rated ripple current of the capacitor. The RMS value of the input ripple electric current is obtained in the following equation. ����������������(������������) = √ ������������ ���������������� × {��������2 × (1 − ������������ ���������������� ) + ∆��������2 12 } Where: IVCC(RMS) is the RMS value of the input ripple electric current. VVCC is the input voltage. DC/DC1 is PVCC, DC/DC2 is VS2, and DC/DC3 is VS3. VVO is the output voltage. DC/DC1 is VO1, DC/DC2 is VO2, and DC/DC3 is VO3. 2.5 Selection of Capacitor CB1 The CB1 is the capacitor between the BOOT1 pin and the SW1 pin for bootstrapping. The voltage of the CB1 and SW1 is same as VREG. The recommended capacitor type is a ceramic capacitor. The CB1 must be set to 47 nF. Moreover, the X7R or better capacitor is recommended. 2.6 Selection of Resistor at the EN Pin The EN pin node potentially have unexpected short to VCC or GND on the assumption of accidental foreign objects that physically shorts pin-to-pin. The resistor in series to the EN pin can minimize the fatal damage for the external components. If the destructive damage is expected by the external components, use the resistor in series to the EN pin to limit the current. The resistance is 20 kΩ or less. CIN0 CIN VCC EN Figure 24. EN Pin Resistance [A] |
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