EVALA5970AD STMicroelectronics, EVALA5970AD Datasheet - Page 20

• Manufacturer Part Number: EVALA5970AD
• Description: BOARD EVAL FOR A5970AD REG
• Manufacturer: STMicroelectronics

Specifications of EVALA5970AD

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.235 ~ 35V
• Current - Output: 1A
• Voltage - Input: 4 ~ 36V
• Regulator Topology: Buck
• Frequency - Switching: 500kHz
• Board Type: Fully Populated
• Utilized Ic / Part: A5970AD
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Closing the loop
20/42
Example:
The gain and phase bode diagrams are plotted respectively in
Figure 11. Module plot
Figure 12. Phase plot
The cut-off frequency and the phase margin are:
Equation 16
Considering R
If L = 15 µH, C
Finally R
F
F
F
F
F
P1
P2
Z1
PLC
ZESR
1
= 1.3 kHz
= 2.9 Hz
= 265 kHz
= 2.5 kHz
= 5.6 kΩ and R
= 8.7 kHz
C
OUT
= 1.8 kΩ, C
= 330 µF and ESR = 55 mΩ, the poles and zeroes of A
F
C
Doc ID 14661 Rev 4
2
=
= 3.3 kΩ.
C
24KHz
= 68nF and C
Phase margin = 64°
P
= 330 pF, the poles and zeroes of A
Figure 11
and
Figure
LC
A5970AD
become:
12.
0
are: