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A6986H Datasheet(PDF) 40 Page - STMicroelectronics

Part # A6986H
Description  Automotive 38 V, 2 A synchronous step-down switching regulator with 30 μA
PDF  71 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6986H Datasheet(HTML) 40 Page - STMicroelectronics

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6.4
Total loop gain
In summary, the open loop gain can be expressed as:
G(s)=GDIV(s)⋅GCO(s)⋅A0(s)
(32)
example 1:
VIN = 12 V, VOUT = 3.3 V, ROUT = 1.67 Ω
Selecting the A6986H with VOUT=3.3 V, fSW = 500 kHz, L = 10 µH, COUT = 20 µF and ESR = 3 mΩ, RC = 75 kΩ,
CC = 330 pF, CP = 2.2 pF (please refer to Table 19. A6986H 3V3 demonstration board BOM), the gain and phase
bode diagrams are plotted respectively in Figure 38. Module plot and Figure 39. Phase plot.
Figure 38. Module plot
BW = 55 kHZ
phase margin = 60 °
Figure 39. Phase plot
The blue solid trace represents the transfer function including the sampling effect term (see Eq. (22)), the dotted
blue trace neglects the contribution.
A6986H
Total loop gain
DS12861 - Rev 3
page 40/71



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