L5980 データシートの表示（PDF） - STMicroelectronics

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L5980

0.7 A step-down switching regulator

STMicroelectronics 

Application information

L5980

Equation 25

C5

=

----------------------------C----4-----------------------------

2π ⋅ R4 ⋅ C4 ⋅ 4 ⋅ BW – 1

For example with VOUT = 1.2 V, VIN = 12 V, IO = 0.7 A, L = 22 μH, COUT = 220 μF,

ESR = 50 mΩ, the type II compensation network is:

R1 = 1.1kΩ, R2 = 249Ω, R4 = 12kΩ, C4 = 47nF, C5 = 68pF

In Figure 15 is shown the module and phase of the open loop gain. The bandwidth is about

35 kHz and the phase margin is 49°.

24/37

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