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W-6137TD-G3 Datenblatt(PDF) 10 Page - Copal Electronics |
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W-6137TD-G3 Datenblatt(HTML) 10 Page - Copal Electronics |
10 / 16 page W-6137 10 Application Information External Component Selection Capacitors The W-6137 only requires small ceramic capacitors of 1 F on the input and 0.22 F on the output. The output capacitor should be rated at 30 V or greater. Under normal conditions, a 1 F input capacitor is sufficient. For applications with higher output power, a larger input capacitor of 2.2 F or 4.7 F may be appropriate. X5R and X7R capacitor types are ideal due to their stability across temperature range. Inductor A22 H inductor is recommended for most of the W-6137 applications. In cases where the efficiency is critical, inductances with lower series resistance are preferred. Several inductor types from various vendors can be used. Figure 24 shows how different inductor types affect the efficiency across the load range. SUMIDA CDRH3D16 220 MURATA LQH32CN220 PANASONIC ELJ EA220 PANASONIC ELJ PC220 Figure 24. Efficiency for Various Inductors LED CURRENT (mA) 30 25 15 5 60 70 80 90 100 20 10 3 LEDs VIN = 3.6 V Schottky Diode The current rating of the Schottky diode must exceed the peak current flowing through it. The Schottky diode performance is rated in terms of its forward voltage at a given current. In order to achieve the best efficiency, this forward voltage should be as low as possible. The response time is also critical since the driver is operating at 1 MHz. Central Semiconductor Schottky CMDSH2 3 (200 mA rated) or the CMDSH 3 (100 mA rated) is recommended for most applications. LED Current Setting The LED current is set by the external resistor between the feedback pin (FB) and ground. The formula below gives the relationship between the resistor and the current: R1 0.3 V LED current Table 5. RESISTOR R1 AND LED CURRENT LED Current (mA) R1 ( ) 5 60 10 30 15 20 20 15 25 12 30 10 |
Ähnliche Teilenummer - W-6137TD-G3 |
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Ähnliche Beschreibung - W-6137TD-G3 |
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