STEVAL-PSQ001V1 STMicroelectronics, STEVAL-PSQ001V1 Datasheet - Page 36

• Manufacturer Part Number: STEVAL-PSQ001V1
• Description: BOARD EVAL BASED ON PM6680A
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-PSQ001V1

• Design Resources: STEVAL-PSQ001V1 Gerber Files STEVAL-PSQ001V1 Schematic STEVAL-PSQ001V1 Bill of Material
• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 6, Non-Isolated
• Voltage - Output: 0.9 ~ 2.5 V, 1 ~ 3.3 V, 2x 3.3 V, 2.5 V, 5 V
• Current - Output: 4A, 2A, 800mA, 400mA, 400mA, 150mA
• Voltage - Input: 5 ~ 36V
• Regulator Topology: Buck
• Frequency - Switching: 200kHz, 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: PM6680A
• Input Voltage: 5 V to 36 V
• Output Voltage: 1 V to 3.3 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: PM6680A
• Kit Application Type: Power Management
• Application Sub Type: Power Supply
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: PM6680A
• Other names: 497-6425; STEVAL-PSQ001V1

Design guidelines
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In order to ensure stability it must be also verified that:
Equation 25
In order to reduce ground noise due to load transient on the other section, it is
recommended to add a resistor R
low pass filter (see figure 13). The cutoff frequency f
times) than the switching frequency of the section:
Equation 26
Due to the capacitive divider (C
Equation 27
Where V
If the ripple is very small (lower than approximately 30 mV), a further compensation network,
named virtual ESR network, is needed. This additional part generates a triangular ripple
that is added to the ESR output voltage ripple at the input of the integrator network. The
complete control schematic is represented in
RIPPLEout
is the output ripple and q is the attenuation factor of the output ripple.
V
RIPPLE
INT
=
R
INT
V
INT
INT
C
, C
RIPPLEout
INT
=
filt
and a capacitor C
2
), the ripple voltage at the COMP pin is given by:
>
π
2
×
π
×
f
CUT
g
×
C
m
Figure 37
f
Zout
INT
×
C
1
C
INT
C
+
×
INT
INT
C
V
CUT
filt
Vr
OUT
×
+
filt
.
C
C
=
must be much greater (10 or more
that, together with C
filt
filt
V
RIPPLEout
×
q
INT
, realize a
PM6680A