STEVAL-ISA052V2 STMicroelectronics, STEVAL-ISA052V2 Datasheet - Page 21

• Manufacturer Part Number: STEVAL-ISA052V2
• Description: BOARD EVAL BASED ON PM6675A
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA052V2

• Design Resources: STEVAL-ISA052V2 Gerber Files STEVAL-ISA052V2 Schematic STEVAL-ISA052V2 Bill of Material
• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 1.5V, 0.6 ~ 3.3V
• Voltage - Input: 4.5 ~ 36 V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: PM6675AS
• Input Voltage: 4.5 V to 36 V
• Output Voltage: 1.5 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• For Use With/related Products: PM6675AS
• Other names: 497-8413

PM6675AS
where k is a fixed design parameter (k > 3). It determinates the minimum integrator
capacitor value:
Equation 7
where gm = 50 µs is the integrator transconductance.
If the ripple on the COMP pin is greater than the integrator 150 mV, the auxiliary capacitor
C
by:
Equation 8
In order to reduce the noise on the COMP pin, it is possible to add a resistor R
together with C
greater (10 or more times) than the switching frequency:
Equation 9
If the ripple is very small (lower than approximately 20 mV), a different compensation
network, called "Virtual-ESR" Network, is needed. This additional circuit generates a
triangular ripple that is added to the output voltage ripple at the input of the integrator. The
complete control scheme is shown in
FILT
can be added. If q is the desired attenuation factor of the output ripple, C
INT
and C
FILT
, realizes a low pass filter. The cutoff frequency f
C
R
INT
INT
>
C
=
Figure 26
FILT
2
2
⋅ π
⋅ π
⎛
⎜
⎝
=
f
CUT
f
SW
C
k
g
INT
m
⋅
−
.
C
C
1
⋅
q
f
Zout
INT
1 (
INT
−
+
⎞
⎟
⎠
) q
⋅
C
⋅
C
Vout
FILT
FILT
Vr
Device description
CUT
FILT
INT
must be
that,
is given
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