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LED7708 Datasheet(PDF) 8 Page - STMicroelectronics |
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LED7708 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 53 page Pin function LED7708 8/53 Doc ID 022698 Rev 1 11 XOVF Internal DAC overflow I/O. Used for extended output voltage regulation and fault management in multi-device applications. It is used to inform slave devices that the maximum output voltage has been reached. A 100 k pull-up resistor to LD03 is required. 12 XMSK Fault detection masking I/O. This signal is used for extended output voltage regulation & fault management in multi-device applications. It is used to avoid incorrect fault detection by forcing slave devices to ignore LED-short detection during output voltage steering. A 100 k pull-up resistor to LD03 is required. 13 FSW Switching frequency selection / synchronization input. Used to set the desired switching frequency of the boost controller. Also used as synchronization input. 14 SYNC Boost converter synchronization output. The buffered switching clock signal is provided at this pin to eventually synchronize other SMPS in the host system. 15 FOSC Dimming oscillator frequency. A resistor to ground sets the frequency of the internal grayscale clock dimming oscillator. If set high, the internal dimming oscillator is disabled and the GSCK pin becomes the clock input (see GSCK pin). 16 CLIM Boost section current limit setting. A resistor between this pin and SGND sets the boost converter current limit. 17 SLOPE Slope compensation setting. A resistor between this pin and SGND is required to set the proper amount of slope compensation to avoid sub-harmonic instability. 18 COMP Transconductance amplifier output. Connect a simple RC series between this pin and SGND to properly compensate the loop-gain of the boost converter. 19 ISETH Output current setting (on). Connect a resistor between this pin and SGND to set the current sunk by each channel during the on-phase of the dimming. 20 ISETL Output current setting (off). Connect a resistor between this pin and SGND to set the current sunk by each channel during the off-phase of the dimming (LED biasing). Connect to LDO3 to disable the bias current. 21 SGND Signal ground. Common return for signals and settings. 22 AGND Analog Ground. Common return for the current generators (channels). 23 CH1 Driver output (channel) #1. 24 CH2 Driver output (channel) #2. 25 CH3 Driver output (channel) #3. 26 CH4 Driver output (channel) #4. 27 CH5 Driver output (channel) #5. 28 CH6 Driver output (channel) #6. 29 CH7 Driver output (channel) #7. 30 CH8 Driver output (channel) #8. 31 CH9 Driver output (channel) #9. 32 CH10 Driver output (channel) #10. 33 CH11 Driver output (channel) #11. 34 CH12 Driver output (channel) #12. 35 CH13 Driver output (channel) #13. Table 2. Pin description (continued) Pin Function |
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