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W-6237TD-3 数据表(PDF) 8 Page - Copal Electronics |
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W-6237TD-3 数据表(HTML) 8 Page - Copal Electronics |
8 / 13 page W-6237 8 Application Information External Component Selection Capacitors The W-6237 only requires small ceramic capacitors of 4.7 F on the input and 0.22 F on the output. Under normal condition, a 4.7 F input capacitor is sufficient. For applications with higher output power, a larger input capacitor of 10 F may be appropriate. X5R and X7R capacitor types are ideal due to their stability across temperature range. Inductor A33 H inductor is recommended for most of the W-6237 applications. In cases where the efficiency is critical, inductances with lower series resistance are preferred. Inductors with current rating of 300 mA or higher are recommended for most applications. Sumida CDRH3D16 330 33 H inductor has a rated current of 320 mA and a series resistance (D.C.R.) of 520 m typical. 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 diode CMDSH05 4 (500 mA rated) is recommended for most applications. LED Current Setting The LED current is set by the external resistor R1 connected between the feedback pin (FB) and ground. The formula below gives the relationship between the resistor and the current: R 1 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 |
类似零件编号 - W-6237TD-3 |
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类似说明 - W-6237TD-3 |
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