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CAT3616 Datasheet(PDF) 9 Page - ON Semiconductor |
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CAT3616 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 14 page CAT3616 http://onsemi.com 9 Table 5. PIN DESCRIPTIONS Pin # Name Function 1 MAIN1 MAIN1 LED cathode terminal (if not used, connect to VOUT) (Note 3) 2 ENM Enable main LED (MAIN1 to MAIN4) input. Active low 3 ENS Enable sub LED (SUB1, SUB2) input. Active low 4 EN Device enable input. Active high. 5 VOUT Charge pump output connected to the LED anodes 6 VIN Supply voltage. 7, 8 C1−, C1+ Bucket capacitor 1 terminal 9, 10 C2−, C2+ Bucket capacitor 2 terminal 11 GND Ground reference 12 SUB2 SUB2 LED cathode terminal (if not used, connect to VOUT) (Note 3) 13 SUB1 SUB1 LED cathode terminal (if not used, connect to VOUT) (Note 3) 14 MAIN4 MAIN4 LED cathode terminal (if not used, connect to VOUT) (Note 3) 15 MAIN3 MAIN3 LED cathode terminal (if not used, connect to VOUT) (Note 3) 16 MAIN2 MAIN2 LED cathode terminal (if not used, connect to VOUT) (Note 3) TAB TAB Connect to Ground on PCB 3. MAIN1 to MAIN4, SUB1, SUB2 pins should not be left floating. They should be connected to the LED cathode, or tied to VOUT pin if not used. Pin Function VIN is the supply pin for the charge pump. A small 1 mF ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is up to 5.5 V. When the input supply falls below the undervoltage threshold (2 V), all LED channels are disabled. EN is the enable logic input. Logic level for high and low are set at 1.3 V and 0.4 V respectively. When EN is initially taken high, the device becomes enabled and all LED currents remain at 0 mA. To place the device into zero current shutdown mode, the EN pin must be held low for 1.5 ms or more. ENM, ENS are the active low enable/ dimming control logic inputs for respectively main and sub LED channels. The falling edge of the first pulse applied to ENM and ENS sets the current for respectively the main and sub LED channels to their full scale of 31 mA. On each consecutive falling edge of the pulse applied to ENM and ENS, the LED current is decreased by 1 mA step. On the 32nd pulse, the LED current is set to zero. The next pulse resets the current back to the full scale of 31 mA. VOUT is the charge pump output that is connected to the LED anodes. A small 1 mF ceramic bypass capacitor is required between the VOUT pin and ground near the device. GND is the ground reference for the charge pump. The pin must be connected to the ground plane on the PCB. C1+, C1− are connected to each side of the 1 mF ceramic bucket capacitor C1. C2+, C2− are connected to each side of the 1 mF ceramic bucket capacitor C2. MAIN1−4, SUB1−2 provide the internal regulated current for each of the LED cathodes. These pins enter a high impedance zero current state whenever the device is placed in shutdown mode. In applications using less than six LEDs, the unused channels should be wired directly to VOUT. This ensures the channel is automatically disabled dissipating less than 200 mA. TAB is the exposed pad underneath the package. For best thermal performance, the tab should be soldered to the PCB and connected to the ground plane. |
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