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CAT3603HV2 Datasheet(PDF) 9 Page - Catalyst Semiconductor |
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CAT3603HV2 Datasheet(HTML) 9 Page - Catalyst Semiconductor |
9 / 12 page CAT3603 © 2006 Catalyst Semiconductor, Inc. 9 Doc. No. 5017 Rev. C Characteristics subject to change without notice LED CURRENT SETTING The LED current is set by the external resistor RSET connected between the RSET pin and ground. Table 1 lists various LED currents and the associated RSET resistor value for standard 1% precision surface mount resistors. Table 1. RSET Resistor Selection LED Current (mA) RSET (kΩ) 1 649 5 287 10 102 15 49.9 20 32.4 25 23.7 30 15.4 The unused LED channels must be disabled by connecting the respective LED pins to VOUT. A disabled channel sinks only 0.2mA typical. When the following equation is true on any channel, the driver turns off the LED channel: VOUT - VLED ≤ 1V (LED channel OFF) Note: The CAT3603 is designed to drive LEDs with forward voltage greater than 1V and is not compatible with resistive loads less than 5k Ω. External Components The driver requires a total of four external 1µF ceramic capacitors: two for decoupling input and output, and two for the charge pump. Both capacitor types X5R and X7R are recommended for the LED driver application. In the 1.5x charge pump mode, the input current ripple is kept very low by design, and an input bypass capacitor of 1µF is sufficient. In 1x mode, the device operating in linear mode does not introduce switching noise back onto the supply. Recommended Layout In 1.5x charge pump mode, the driver switches internally at a high frequency of 1MHz. It is recommended to minimize trace length to all four capacitors. A ground plane should cover the area under the driver IC as well as the bypass capacitors. Short connection to ground on capacitors CIN and COUT can be implemented with the use of multiple via. A copper area matching the TDFN exposed pad (GND) must be connected to the ground plane underneath. The use of multiple via improves the package heat dissipation. Figure 3. Recommended Layout |
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