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L5988D 데이터시트(PDF) 16 Page - STMicroelectronics

부품명 L5988D
상세설명  Pre-bias start up capability
PDF  52 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5988D 데이터시트(HTML) 16 Page - STMicroelectronics

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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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