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MAX16826 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX16826 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 26 page Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection 8 _______________________________________________________________________________________ Pin Description PIN NAME FUNCTION 1 PGND Power Ground 2, 3 GND Analog Ground 4 RTCT Timing Resistor and Capacitor Connection. A resistor, R19 (in the Typical Application Circuit), from VCC to RTCT and a capacitor C33, from RTCT to GND set the oscillator frequency. See the Oscillator section to calculate RT and CT component values. 5 SYNC/EN Synchronization and Enable Input. There are three operating modes: SYNC/EN = LOW: Low current shutdown mode with all circuits shut down except shunt regulator. SYNC/EN = HIGH: All circuits active with oscillator frequency set by RTCT network. SYNC/EN = CLOCKED: All circuits active with oscillator frequency set by SYNC clock input. Conversion cycles initiate on the rising edge of external clock input. The frequency programmed by R19/C33 must be 10% lower than the input SYNC/EN signal frequency. 6 CSS Soft-Start Timing Capacitor Connection. Connect a capacitor from CSS to GND to program the required soft- start time for the switching regulator output voltage to reach regulation. See the Soft-Start (CSS) section to calculate CCSS. 7 COMP Switching Regulator Compensation Component Connection. Connect the compensation network between COMP and FB. 8FB Switching Regulator Feedback Input. Connect FB to the center of a resistor-divider connected between the switching regulator output and GND to set the output voltage. FB is regulated to a voltage set by an internal register. See the Setting Output Voltage section for calculating resistor values. 9 OVP Switching Regulator Overvoltage Input. Connect OVP to the center of a resistor-divider connected between the switching regulator output and GND. For normal operation, configure the resistor-divider so that the voltage at this pin does not exceed 1.25V. If operation under load dump conditions is also required, configure the resistor- divider so that the voltage at OVP is less than 1.25V. 10 RSC Slope Compensation Resistor and PWM Comparator Input Connection. Connect a resistor, R17, from RSC to the switching current-sense resistor to set the amount of the compensation ramp. See the Slope Compensation (RSC) section for calculating the value. 11 SDA I2C Serial Data Input/Output 12 SCL I2C Serial Clock Input 13 DIM1 LED String 1 Logic-Level PWM Dimming Input. A high logic level on DIM1 enables the current sink to operate at the maximum current as determined by its sense resistor and internal register value. A low logic level disables the current source. 14 DIM2 LED String 2 Logic-Level PWM Dimming Input. A high logic level on DIM2 enables the current sink to operate at the maximum current as determined by its sense resistor and internal register value. A low logic level disables the current source. 15 DIM3 LED String 3 Logic-Level PWM Dimming Input. A high logic level on DIM3 enables the current sink to operate at the maximum current as determined by its sense resistor and internal register value. A low logic level disables the current source. 16 DIM4 LED String 4 Logic-Level PWM Dimming Input. A high logic level on DIM4 enables the current sink to operate at the maximum current as determined by its sense resistor and internal register value. A low logic level disables the current source. 17 CS1 LED String 1 Current-Sense Input. CS1 is regulated to a value set by an internal register. The regulation voltage can be set between 97mV and 316mV. |
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