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LDS8711 Datasheet(PDF) 6 Page - IXYS Corporation |
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LDS8711 Datasheet(HTML) 6 Page - IXYS Corporation |
6 / 12 page ![]() LDS8711 © 2010 IXYS Corp. 6 Doc. No. 8711DS, Rev. N1.0 Characteristics subject to change without notice PIN DESCRIPTION Pin # Name Function 1 VIN Input Voltage, connect to battery or power supply 2 GND Analog Ground 3 PGND Power Ground 4 SW Switch input; Connect inductor terminal to this pin 5 VOUT Output voltage; Connect to the LED string anode terminal to this pin. 6 HVB High Voltage Bypass; Connect a 0.01 µF capacitor between this point and VOUT 7 LEDS Current Sense input. Connect LED string cathode terminal to this pin 8 EN/PWM Device Enable (active high) and Dimming Control PAD PAD Connect to GND on the PCB Top view: TDFN 8-lead 2 X 3 mm PIN FUNCTION VIN is the supply pin for the driver. A small 1 μF ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is from 2.7 V to 5.5 V. If the input supply voltage falls below the under-voltage threshold, switch is disabled, and the device enters shutdown mode. HVB is the internal high voltage reference point. Connect a 4700 µF capacitor between this point and VOUT. EN/PWM is the Enable/Smart OneWire ™ inteface and PWM control logic input. Guaranteed levels of logic high and logic low are set at 1.4 V and 0.4 V respectively. When EN/PWM is initially taken high, the device becomes enabled and wait for the first pulse that determines mode, at which device will operate. If first pulse is equal tSETUP1, LED current sets to factory programmed value and every next incoming pulse will be recognized as PWM signal. If first pulse is equal tSETUP2, device enters Smart OneWire ™ interface mode and wait for command. Every next of 16 incoming pulses will be recognized as command. If device is not able to recognize command due error in transmition, it enters shutdown mode after 10 ms. To place the device into shutdown mode, the EN/PWM pin must be held low for more than 10 ms. VOUT is the driver’ output that is connected to the LED anode. A ceramic bypass capacitor is required between the VOUT pin and ground near the device. GND is the ground reference for the analog circuits. The pin must be connected to the ground plane on the PCB. Avoid high currents flowing trough traces connecting this pin with EN/PWM signal source. PGND is the current return for high current circuits. The pin must be connected to the ground plane on the PCB. Connect GND and PGND as close to the driver as possible. LEDS is the Current Sense pin that provides internal regulated current sink for LED string. Connect LED string cathode to this pin. This pin enter high- impedance zero current state whenever the device is in shutdown mode. PAD is the exposed pad underneath the package. For best thermal performance, the pad should be soldered to the PCB and connected to the ground plane |
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