L5985 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L5985' PDF : 36 Pages View PDF
L5985
Application informations
The suggested maximum system bandwidth is equals to the switching frequency divided by
3.5 (FSW/3.5), anyway lower than 100kHz if the FSW is set higher than 500kHz.
For example with VOUT = 3.3V, VIN = 12V, IO = 2A, L = 15µH, COUT = 22µF, the type III
compensation network is:
R1 = 4.99kΩ, R2 = 1.1kΩ, R3 = 150Ω, R4 = 4.99kΩ, C3 = 3.3nF, C4 = 10nF, C5 = 100pF
In Figure 12 is shown the module and phase of the open loop gain. The bandwidth is about
75kHz and the phase margin is 47°.
Figure 12. Open loop gain Bode diagram with ceramic output capacitor
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