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LT1303CS8 Datasheet(PDF) 8 Page - Linear Technology |
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LT1303CS8 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT1303/LT1303-5 APPLICATIONS INFORMATION Figure 8. This Inductor Saturates at IL≈1A. A Poor Choice LT1303 F08 PHONE VENDOR SERIES TYPE NUMBERS AVX TPS Surface Mount (803) 448-9411 Sanyo OS-CON Through-Hole (619) 661-6835 Panasonic HFQ Through-Hole (201) 348-5200 Sprague 595D Surface Mount (603) 224-1961 Table 2. Recommended Capacitors Capacitor Selection Input and output capacitors should have low ESR for best efficiency. Recommended capacitors include AVX TPS series, Sprague 595D series, and Sanyo OS-CON. The output capacitor’s ESR determines the high frequency ripple amplitude. A 100 µF capacitor is the minimum rec- ommended for a 5V output. Higher output voltages can use lower capacitance values. For example, a 12V output can use a 33 µF or 47µF capacitor. The VIN pin of the LT1303 should be decoupled with a 47 µF or 100µF capacitor at the pin. When driving a transformer, an additional decoupling network of 10 Ω and 0.1µF ceramic is recommended as shown in Figure 10. Diode Selection The LT1303’s high switching speed demands a high speed rectifier. Schottky diodes are preferred for their low for- ward drop and fast recovery. Suitable choices include the 1N5817, MBRS120LT3, and MBR0520LT1. Do not use signal diodes such as 1N4148. They cannot carry 1A current. Also avoid “general-purpose” diodes such as 1N4001. These are far too slow and are unsuitable for any switching regulator application. For high temperature applications a silicon diode such as the MUR105 will have less leakage. LT1303 F09 Figure 9. Slight Exponential Shape to Inductor Current Waveform Indicates Excessive DC Resistance + 47 µF 0.1 µF CERAMIC 10 Ω VIN • • • LT1303 F10 VIN SW GND PGND LT1303 Figure 10. 10 Ω-1µF Network to LT1303 VIN Pin Provides Additional Decoupling. Recommended When Driving Transformers. |
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