TLD5098EL Datasheet, PDF (36/39 Pages) Infineon Technologies AG – DC/DC Boost, Buck-Boost, SEPIC controller

TLD5098EL
Application Information
11.1
Further Application Information
In fixed frequency mode where an external resistor configures the switching frequency the minimum boost inductor
is given by the formula in Figure 27.
• L_MIN = Minimum Inductance Required During Fixed Frequency Operation
• V_BO = Boost Output Voltage
• R_CS = Current Sense Resistor
• f_FREQ = Switching Frequency
L_MIN
≥
-----------V----^B----^O----^[--V-----^]----^×----R-----^C---^S----^[--^Ω-----^]-----------
106×10^–3[V] × f_FREQ[Hz]
Figure 27 Minimum Inductance Required During Fixed Frequency Operation (B2G configuration)
In synchronization mode where an external clock source configures the switching frequency the minimum boost
inductor is given by the formula in Figure 28.
• L_SYNC = Minimum Inductance Required During Synchronization Operation
• V_BO = Boost Output Voltage
• R_CS = Current Sense Resistor
L_SYNC
≥
------V-----^B---^O-----^[--V-----^]---^×-----R----^C----^S---^[---^Ω-----^]------
106×10^–3[V] × 250kHz
Figure 28 Minimum Inductance Required During Synchronization Operation (B2G configuration)
• Please contact us for information regarding the FMEA pin.
• Existing App. Note (Title)
• For further information you may contact http://www.infineon.com/
Datasheet
36
Rev. 1.0, 2010-10-13