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LDS8846 Datasheet(PDF) 5 Page - IXYS Corporation |
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LDS8846 Datasheet(HTML) 5 Page - IXYS Corporation |
5 / 12 page ![]() LDS8846 © 2009 IXYS Corp. 5 Doc. No. 8846DS, Rev. N1.6 Characteristics subject to change without notice PIN DESCRIPTION Pin # Name Function 1 EN Device Enable. 2 CTRL0 Output Control Bit 0 (See Table Control Pin Function) 3 CTRL1 Output Control Bit 1 (See Table Control Pin Function) 4 CTRL2 Output Control Bit 2 (See Table Control Pin Function) 5 ISET LED current setting pin 6 VOUT Output voltage to the LED anodes 7 VIN Input Voltage 8 - 11 NC No internal connect 12 PGND Power Ground 13 LED4 LED4 Cathode Terminal 14 LED3 LED3 Cathode Terminal 15 LED2 LED2 Cathode Terminal 16 LED1 LED1 Cathode Terminal PAD PAD Connect to GND on the PCB PIN FUNCTION EN is a Device Enable. This pin is high impedance. There should be a pull down resistor <100k when control signal is floating. CTRL0, CTRL1, CTRL2 are Output Control Bits (See Table 2) and PWM LED brightness control logic inputs. Guaranteed levels of logic high and logic low are set at 1.3 V and 0.4 V respectively. CTRL0 and CTRL1 pins are high impedance, and they should be pull down by resistor <100k when control signal is floating. CTRL2 pin has internal pull-up resitor ~100k. ISET is a LED current setting pin. Resistor RSET connected from this pin to ground controls LED current. Connect this pin to ground directly for factory preset LED current value 30 mA. VIN is the device supply pin. A small 1μF ceramic bypass capacitor is required between the VIN pin and ground at the device. The operating input voltage range is from 2.7 V to 5.5 V. Whenever the input supply falls below the under-voltage threshold (2.2 V), all the LED channels are disabled, and the device enters shutdown mode. VOUT is the charge pump output. Connect it to the LED anodes. A small 1μF ceramic bypass capacitor is required between the VOUT pin and ground near the device. GND is the current regulators ground current source. Connect this pin to the ground plane on the PCB as close to the package as possible. LED1 – LED4 provide the internal regulated current sink for each of the LED cathodes. These pins enter a high-impedance zero current state when the device is in shutdown mode. PAD 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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