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HT7945 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc |
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HT7945 Datasheet(HTML) 3 Page - Holtek Semiconductor Inc |
3 / 11 page Rev. 1.00 3 April 13, 2012 HT7945 Pin Assignment LED7 LED8 1 6 7 18 12 19 13 24 Exposed Pad EN DIM LED1 ISET AGND1 COMP LX1 LX2 PGND2 TOP VIEW PGND3 HT7945 24 QFN-A 4mm x 4mm Pin Description PIN Name Description 1 EN Enable Input. When low, the device is powered down. If tied high or left open, the device is active. 2, 10 AGND1, AGND2 Analog ground 3 COMP Error Amplifier Output. A simple RC series is connected between this pin and the analog ground for boost regulator loop compensation. 4 DIM Dimming Input. LED backlight strings PWM control pin. 5 ISET Full Scale LED Current Adjustment Pin. Selection implemented by connection a resistor beteen this pin and the analog ground. 6~9, 11~14 LED1 ~ LED8 LED current sink. Internal regulator open-drain outputs Can sink up to 30mA. If unused, the pins should be left open. 15, 16 LX2, LX1 Switching Node. Internal Power MOSFET drain output. Inductor and Schottky diode are connected to these pins. 17~19 PGND1 ~ PGND3 Power Ground. Power MOSFET return path. 20 IN Input Voltage. Input voltage range from 4.5V to 26V. Bypass IN to analog ground directly at the pin with 0.1uF or greater ceramic capacitor. 21 VCC5 Internal 5.2V LDO Output. Bypass to analog ground with a 10uF or greater ceramic capacitor. If VIN is less than or equal to 6.0V, connect VCC5 to IN to disable the internal LDO. 22 AVDD Power MOSFET Gate Drive Supply. Bypass AVDD to analog ground with a ceramic capacitor of 10uF or greater. 23 OVP Over Voltage Protection. Used to set the desired OVP threshold using an external resistor divider. The detector threshold is 1.28V (typ.) VOVP=VOUT+3V. 24 OSC Oscillator Frequency Selection. Connect OSC to VCC5 to set the oscillator frequency to 1MHz. Connect OSC to analog ground to set the frequency to 500kHz. — E.P. Exposed Pad. Connect to GND plane of the PCB. |
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