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EC3293 Datasheet(PDF) 10 Page - E-CMOS Corporation |
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EC3293 Datasheet(HTML) 10 Page - E-CMOS Corporation |
10 / 11 page 3A, 18V, Synchronous Step-down DC/DC Converter EC3293 E-CMOS Corp. (www.ecmos.com.tw) Page 10 of 11 3L03N-Rev.P001 External Bootstrap Diode An external bootstrap diode may enhance the efficiency of the regulator, the applicable conditions of external BOOT diode are: ● V OUT = 5V or 3.3V; and ● Duty cycle is high: D = V OUT/VIN > 65% In these cases, an external BOOT diode is recommended from the output of the voltage regulator to BOOT pin, as shown in Figure 1. Figure 1: Add optional external bootstrap diode to enhance efficiency. The recommended external BOOT diode is IN4148, and the BOOT capacitor is 0.1 ~ 1μF. When VIN ≤ 6V, for the purpose of promote the efficiency, it can add an externalSchottky diode between IN and BOOT pins, as shown in Figure 2. Figure 2: Add a Schottky diode to promote efficiency when VIN ≤ 6V. Table 3: BOM selection table II. Note: To guarantee the bandwidth, if decrease the value of C2, then R3 must be reduced in proportion to C2, and C3 must be increased in proportion to C2. PCB Layout Guide PCB layout is very important to achieve stable operation. Please follow the guidelines below. 1) Keep the path of switching current short and minimize the loop area formed by Input capacitor, high-side MOSFET and low-side MOSFET. 2) Bypass ceramic capacitors are suggested to be put close to the VIN Pin. 3) Ensure all feedback connections are short and direct. Place the feedback resistors and compensation components as close to the chip as possible. 4) Rout SW away from sensitive analog areas such as FB. 5) Connect IN, SW, and especially GND respectively to a large copper area to cool the chip to improve thermal performance and long-term reliability. BOM of EC3293 Please refer to the Typical Application Circuit. Table 2: BOM selection table I. L1 R1 R2 R3 C2 C3 Rfreq C8 Vout = 5.0V 6.8uH 44.2K 10K 100K 22uFx2 100pF 175K 100pF Vout = 3.3V 4.7uH 25.7K 10K 100K 22uFx2 100pF 175K 100pF Vout = 2.5V 4.7uH 17.1K 10K 100K 22uFx2 100pF 175K 50pF Vout = 1.8V 3.3uH 9.5K 10K 100K 22uFx2 100pF 175K 50pF Vout = 1.2V 2.2uH 3K 10K 62K 22uFx2 200pF 240K 20pF Vout = 1.0V 2.2uH 0.834K 10K 62K 22uFx2 200pF 240K 20pF Item Reference Part 1 C1 10μF 2 C5 100nF 3 C7 0.1μF 4 R4 100K |
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