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MAX16834ATPV+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX16834ATPV+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 23 page High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver ______________________________________________________________________________________ 11 Programming the LED Current The LED current is programmed using the voltage on REFI and the LED current-sense resistor R10 (see Figure 2). The current is given by: where VREF is 3.7V and the resistors R5, R6, and R10 are in ohms. The regulation voltage on the LED current- sense resistor must not exceed 0.3V to prevent activa- tion of the LED short-circuit protection circuit. Boost Configuration In the boost converter (Figure 2), the average inductor current varies with the line voltage. The maximum aver- age current occurs at the lowest line voltage. For the boost converter, the average inductor current is equal to the input current. Calculate maximum duty cycle using the below equation. where VLED is the forward voltage of the LED string in volts, VD is the forward drop of the rectifier diode D1 in volts (approximately 0.6V), VINMIN is the minimum input supply voltage in volts, and VFET is the average drain to source voltage of the MOSFET Q1 in volts when it is on. Use an approximate value of 0.2V initially to calculate DMAX. A more accurate value of the maximum duty cycle can be calculated once the power MOSFET is selected based on the maximum inductor current. Use the following equations to calculate the maximum average inductor current ILAVG, peak-to-peak inductor current ripple ∆IL, and the peak inductor current ILP in amperes: D VV V VV V MAX LED D INMIN LEDDFET = +− +− I VR RR R A LED REF = × ×+× () 5 10 6 5 9 9 () . VIN LV NDRV Q1 ON OFF CS C1 PWMDIM SGND D1 R10 R8 MAX16834 FLT DIMOUT SENSE+ OVP+ CLV COMP PGND C3 UVEN HV SC RT/SYNC C2 IN L1 VCC C5 REF C4 R3 REFI R5 R6 R2 R1 R9 R4 C7 R7 Q2 C6 C8 LED+ LEDs LED- Figure 2. Boost LED Driver |
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