поискавой системы для электроныых деталей |
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TS1935B датащи(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
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TS1935B датащи(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
4 / 8 page TS1935B 1.9A / 1.2MHz Boost DC to Dc Converter 4/8 Version: A12 Application Information Setting the Output Voltage Application circuit item shows the basic application circuit with AX5511 adjustable output version. The external resistor sets the output voltage according to the following equation: ) R1 R2 + (1 × 1.238V = V OUT For most applications, R2 is a suggested a value by 390K~820KΩ. Place the resistor-divider as close to the IC as possible to reduce the noise sensitivity. Under Voltage Lockout (UVLO) To avoid mis-operation of the device at low input voltages an under voltage lockout is included that disables the device, if the input voltage falls below (2.35V-130mV). Input Capacitor Selection The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must be used. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. A 10µF ceramic capacitor for most applications is sufficient. For a lower output power requirement application, this value can be decreased. Output Capacitor Selection The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The output capacitor must have low impedance at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their low ESR and high ripple current. A 4.7uF ceramic capacitors works for most of the applications. Higher capacitor values can be used to improve the load transient response. Layout Guide |
Аналогичный номер детали - TS1935B |
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Аналогичное описание - TS1935B |
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