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LED7707 Datasheet(PDF) 6 Page - STMicroelectronics |
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LED7707 Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 48 page  Pin settings LED7707 6/48 2.2 Pin description Table 2. Pin functions N° Pin Function 1COMP Error amplifier output. A simple RC series between this pin and ground is needed to compensate the loop of the boost regulator. 2RILIM Output generators current limit setting. The output current of the rows can be programmed connecting a resistor to SGND. 3 BILIM Boost converter current limit setting. The internal MOSFET current limit can be programmed connecting a resistor to SGND. 4FSW Switching frequency selection and external sync input. A resistor to SGND is used to set the desired switching frequency. The pin can also be used as external synchronization input. See Section 5.1.5 on page 16 for details. 5MODE Current generators fault management selector. It allows to detect and manage LEDs failures. See Section 5.3.2 on page 23 for details. 6 AVCC + 5 V analog supply. Connect to LDO5 through a simple RC filter. 7LDO5 + 5V LDO output and power section supply. Bypass to SGND with a 1 µF ceramic capacitor. 8 VIN Input voltage. Connect to the main supply rail. 9SLOPE Slope compensation setting. A resistor between the output of the boost converter and this pin is needed to avoid sub-harmonic instability. Refer to Section 6.1 on page 26 for details. 10 SGND Signal ground. Supply return for the analog circuitry and the current generators. 11 ROW1 Row driver output #1. 12 ROW2 Row driver output #2. 13 ROW3 Row driver output #3. 14 ROW4 Row driver output #4. 15 ROW5 Row driver output #5. 16 ROW6 Row driver output #6. 17 PGND Power ground. Source of the internal Power MOSFET. 18 OVSEL Over-voltage selection. Used to set the desired 0 V threshold by an external divider. See Section 5.1.4 on page 15 for details. 19 LX Switching node. Drain of the internal Power MOSFET. 20 DIM Dimming input. Used to externally set the brightness by using a PWM signal. 21 EN Enable input. When low, the device is turned off. If tied high or left open, the device is turned on and a soft-start sequence takes place. 22 FAULT Fault signal output. Open drain output. The pin goes low when a fault condition is detected (see Section 5.3.1 on page 23 for details). 23 SYNC Synchronization output. Used as external synchronization output. 24 SS Soft-start. Connect a capacitor to SGND to set the desired soft-start duration. |
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