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SP7680EB 数据表(PDF) 14 Page - Sipex Corporation |
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SP7680EB 数据表(HTML) 14 Page - Sipex Corporation |
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14 / 16 page  June 21-07 revH SP7680: Complete Backlight Solution 2007 Sipex Corporation Page 14 Ceramic Capacitor Materials Capacitors with large output values are typically composed of X7R, X5R, Z5U, or Y5V dielectric materials, but Z5U and Y5V are not recommended since they have a large change in value with temperature. X5R and X7R capacitors are recommended since they are relatively low in cost and their output value changes with temperature are relatively small. Capacitor Selection Careful selection of the four external capacitors CIN, C1, C2, and COUT is important because they will affect turn-on time, output ripple, and transient performance. Optimum performance will be obtained when low equivalent series resistance (ESR) ceramic capacitors are used. In general, low ESR may be defined as less than 100m . A value of 2.2µF for the input and 1µF for the output capacitor is sufficient for most applications. The fly capacitors C1 and C2 can be 0.47µF for most applications. For applications with all 7 LED drivers used and driven to 20mA or more, it is advisable to use a 2.2µF input capacitor in order to reduce the input ripple as seen by the battery. In very noise sensitive applications, the input capacitor can even be increased to 4.7µF. If the LED current-sinks are only programmed for low current levels, or if the application is not very noise sensitive, then a 1µF input capacitor may be used. See table 1 for capacitor selection. Thermal Protection The SP7680 has a thermal protection circuit that will shut down the internal LDO and charge pump if the die temperature rises above the thermal limit, and will restart when the die temperature drops about 25°C below the thermal limit. Table 1: SP7680 Capacitor Selection Manufacturers/ Website Part Number Capacitance/ Voltage Capacitor Size/Type/Thickness ESR at 100kHz TDK/www.tdk.com C1005X5R0J474K 0.47uF/6.3V 0402/X5R/0.55mm 0.05 TDK/www.tdk.com C1005X5R0J105K 1uF/6.3V 0402/X5R/0.55mm 0.03 TDK/www.tdk.com C1608X5R0J225K 2.2uF/6.3V 0603/X5R/0.9mm 0.03 TDK/www.tdk.com C1608X5R0J475K 4.7uF/6.3V 0603/X5R/0.9mm 0.02 Murata/www.murata.com GRM155R60J474KE19 0.47uF/6.3V 0402/X5R/0.55mm 0.05 Murata/www.murata.com GRM155R60J105KE19 1uF/6.3V 0402/X5R/0.55mm 0.03 Murata/www.murata.com GRM185R60J225KE26 2.2uF/6.3V 0603/X5R/0.55mm 0.03 Murata/www.murata.com GRM188R60J475KE19 4.7uF/6.3V 0603/X5R/0.8mm 0.02 APPLICATIONS INFORMATION |
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