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CAT4002A Datasheet(PDF) 6 Page - ON Semiconductor |
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CAT4002A Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 11 page CAT4002A, CAT4004A http://onsemi.com 6 Table 6. PIN DESCRIPTIONS Name Function EN/DIM Device enable (active high) and dimming control GND Ground reference LED1 LED1 cathode terminal LED2 LED2 cathode terminal LED3 LED3 cathode terminal (CAT4004A only) LED4 LED4 cathode terminal (CAT4004A only) RSET Connect external RSET resistor to set the LED current VIN Device supply input, connect to battery or supply TAB Connect to GND on the PCB (CAT4004A only) 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 from 2.5 V to 5.5 V. Whenever the input supply falls below the under−voltage threshold (2.0 V), all the LED channels are disabled and the device enters shutdown mode. EN/DIM is the enable and one wire dimming input for all LED channels. Levels of logic high and logic low are set at 1.3 V and 0.4 V respectively. When EN/DIM is initially taken high, the CAT400XA becomes enabled and the LED channel current is set to the full scale according to the resistor RSET. To place the device into “zero current” shutdown mode, the EN/DIM pin must be held low for 3 ms typical. LED1 to LED4 provide the internal regulated current for each of the LED cathodes. There pins enter a high impedance zero current state whenver the device is placed in shutdown mode. RSET is connected to the resistor (RSET) to set the full scale current for the LEDs. The voltage at this pin is regulated to 0.6 V. The ground side of the external resistor should be star connected back to the GND of the PCB. In shutdown mode, the RSET input becomes high impedance. GND is the ground reference for the device. The pin must be connected to the ground plane on the PCB. TAB (CAT4004A only) 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. Block Diagram 4 Current Sink Regulators Current Setting DAC Undervoltage Lockout Register Serial Interface RSET 100 kW EN/DIM GND VIN Reference Voltage Figure 15. CAT4004A Functional Block Diagram VIN |
Número de pieza similar - CAT4002A_11 |
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Descripción similar - CAT4002A_11 |
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