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LED7706TR Datasheet(PDF) 20 Page - STMicroelectronics |
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LED7706TR Datasheet(HTML) 20 Page - STMicroelectronics |
20 / 31 page Operation description - boost section LED7706 20/31 Figure 12. Main loop and current loop diagram The SLOPE pin allows to properly set the amount of slope compensation connecting a simple resistor RSLOPE between the SLOPE pin and the output. The compensation ramp starts at 35 % (typ.) of each switching period and its slope is given by the following equation: Equation 12 Where KSLOPE = 5.8 x10 10S-1, V BE = 2 V (typ.) and SE is the slope ramp in [A/s]. To avoi-d sub-harmonic instability, the compensating slope should be at least half the slope of the inductor current during the off-phase for a duty-cycle greater than 50 % (i.e. at the lowest input voltage). The value of RSLOPE can be calculated according to equation 13. Equation 13 VIN 0.4V PWM Minimum voltage drop selector COMP LX ROWx SGND RILIM g m ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − − = SLOPE BE IN OUT SLOPE E R V V V K S ) V V ( ) V V V ( L K 2 R IN OUT BE IN OUT SLOPE SLOPE − − − ⋅ ⋅ ⋅ ≤ |
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