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L5988D Datasheet(PDF) 16 Page - STMicroelectronics |
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L5988D Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 52 page  Functional description L5988D 16/52 DocID15324 Rev 4 To improve the line transient performance, the voltage feed forward is implemented by changing the slope of the sawtooth according to the input voltage change (see Figure 6 a). Figure 6. Sawtooth: voltage feed forward The slope of the sawtooth does not change if the oscillator frequency is increased by an external signal or adjusted by the external resistor (see Figure 7). As a consequence the gain of the PWM stage is a function of the switching frequency and its contribution must be taken in account when performing the calculations of the compensation network (see Section 6.4.1 on page 29 and Section 6.4.2 on page 33). Figure 7. Sawtooth: synchronization and frequency adjust Table 8. FSW resistor examples R1 (k )fSW (kHz) R2 (k )fSW (kHz) 43 198 360 450 47 215 180 499 56 245 120 548 62 261 91 594 82 295 56 711 110 322 43 801 150 343 33 915 220 361 27 1022 |
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