STEVAL-ISA052V2 STMicroelectronics, STEVAL-ISA052V2 Datasheet - Page 21
![BOARD EVAL BASED ON PM6675A](/photos/9/13/91340/steval-isa052v2_sml.jpg)
STEVAL-ISA052V2
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA052V2
Manufacturer:
STMicroelectronics
Quantity:
1
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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