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LM1937 Scheda tecnica(PDF) 4 Page - HTC Korea TAEJIN Technology Co. |
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LM1937 Scheda tecnica(HTML) 4 Page - HTC Korea TAEJIN Technology Co. |
4 / 6 page WHITE LED STEP-UP CONVERTER LM1937 HTC - 4 - APPLICATIONS INFORMATION Inductor Selection A 22mH inductor is recommended for most LM1937 applications. Although small size and high efficiency are major concerns, the inductor should have low core losses at 1.2MHz and low DCR (copper wire resistance). Some inductors in this category with small size are listed in Table 1. The efficiency comparison of different inductors is shown in Figure 3. Table 1. Recommended Inductors Figure 3. Efficiency Comparison of Different Inductors Capacitor Selection The small size of ceramic capacitors makes them ideal for LM1937 applications. X5R and X7R types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as Y5V or Z5U. A 1µF input capacitor and a 0.22µF output capacitor are sufficient for most LM1937 applications. Table 2. Recommended Ceramic Capacitor Manufacturers Diode Selection Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for LM1937 applications. The forward voltage drop of a Schottky diode represents the conduction losses in the diode, while the diode capacitance (CT or CD) represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can cause significant switching losses at the 1.2MHz switching frequency of the LM1937. A Schottky diode rated at 100mA to 200mA is sufficient for most LM1937 applications. Some recommended Schottky diodes are listed in Table 3. Table 3. Recommended Schottky Diodes |
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