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LM2758TLX bảng dữ liệu(PDF) 10 Page - National Semiconductor (TI) |
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LM2758TLX bảng dữ liệu(HTML) 10 Page - National Semiconductor (TI) |
10 / 14 page ANALOG BRIGHTNESS CONTROL 30045318 The current though the LED could be varied dynamically by changing the I SET current. The above figure shows the circuit. The current though the LED can be calculated as follows. 30045317 CAPACITOR SELECTION The LM2758 requires 4 external capacitors for proper opera- tion. Surface-mount multi-layer ceramic capacitors are rec- ommended. These capacitors are small, inexpensive and have very low equivalent series resistance (ESR <20 m Ω typ.). Tantalum capacitors, OS-CON capacitors, and alu- minum electrolytic capacitors are not recommended for use with the LM2758 due to their high ESR, as compared to ce- ramic capacitors. For most applications, ceramic capacitors with X7R or X5R temperature characteristic are preferred for use with the LM2758. These capacitors have tight capaci- tance tolerance (as good as ±10%) and hold their value over temperature (X7R: ±15% over -55°C to 125°C; X5R: ±15% over -55°C to 85°C). Capacitors with Y5V or Z5U temperature characteristic are generally not recommended for use with the LM2758. Capacitors with these temperature characteristics typically have wide capacitance tolerance (+80%, -20%) and vary significantly over temperature (Y5V: +22%, -82% over -30°C to +85°C range; Z5U: +22%, -56% over +10°C to +85° C range). Under some conditions, a nominal 1 μF Y5V or Z5U capacitor could have a capacitance of only 0.1 μF. Such detri- mental deviation is likely to cause Y5V and Z5U capacitors to fail to meet the minimum capacitance requirements of the LM2758. The voltage rating of the output capacitor should be 6.3V or more. For example, a 6.3V 0603 2.2 μF output ca- pacitor (TDK C1608X5R0J225) is acceptable for use with the LM2758, as long as the capacitance on the output does not fall below a minimum of 1 μF in the intended application. All other capacitors should have a voltage rating at or above the maximum input voltage of the application and should have a minimum capacitance of 1 μF. Suggested Capacitors and Suppliers MFG Part No. Type MFG Voltage Rating Case Size Inch (mm) 2.2 µF for C IN and COUT C1608X5R0J225 Ceramic X5R TDK 6.3V 0603 (1608) JMK107BJ225 Ceramic X5R Taiyo-Yuden 6.3V 0603 (1608) 1 µF for C1 and C2 C1608X5R0J105 Ceramic X5R TDK 6.3V 0603 (1608) JMK107BJ105M Ceramic X5R Taiyo-Yuden 6.3V 0603 (1608) www.national.com 10 |
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