STEVAL-ISA051V1 STMicroelectronics, STEVAL-ISA051V1 Datasheet - Page 49
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STEVAL-ISA051V1
Manufacturer Part Number
STEVAL-ISA051V1
Description
BOARD EVAL PM6670S DDR2/3
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA051V1
Design Resources
STEVAL-ISA051V1 Gerber Files STEVAL-ISA051V1 Schematic STEVAL-ISA051V1 Bill of Material
Main Purpose
Special Purpose DC/DC, DDR Memory Supply
Outputs And Type
4, Non-Isolated
Voltage - Output
1.5V, 1.8V
Voltage - Input
4.5 ~ 28V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
PM6670
Input Voltage
4.5 V to 28 V
Output Voltage
1.8 V, 1.5 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
PM6670S
Kit Application Type
Power Management
Application Sub Type
DDR2/3 Memory Power Supply Controller
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Power - Output
-
Frequency - Switching
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
PM6670S
Other names
497-8411
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA051V1
Manufacturer:
STMicroelectronics
Quantity:
1
PM6670S
If the ripple on pin COMP is greater than the integrator output dynamic (150 mV), an
additional capacitor C
attenuation factor of the output ripple, select:
Equation 50
In order to reduce noise on pin COMP, it's possible to introduce a resistor R
with C
greater (10 or more times) than the switching frequency of the section:
Equation 51
For most of applications both R
If the ripple is very small (e.g. such as with ceramic capacitors), an additional compensation
network, called “Virtual ESR” network, is needed. This additional part generates a triangular
ripple that substitutes the ESR output voltage ripple. The complete compensation scheme is
represented in
Figure 43. Virtual ESR network
INT
Generation
Block
and C
Ton
Figure 43
filt
, becomes a low pass filter. The cutoff frequency f
filt
could be added in order to reduce its amplitude. If q is the desired
.
PWM Comparator
Doc ID 14432 Rev 4
INT
R
+
INT
-
and C
C
=
filt
2
VREF
⋅ π
filt
=
f
C
CUT
are unnecessary.
INT
C
C
⋅
q
1
1 (
INT
INT
R
−
INT
C
+
C
) q
⋅
FILT
C
INT
C
FILT
FILT
Integrator
g
R
m
+
-
Application information
CUT
L
C
R1
0.9V
must be much
INT
that, together
VDDQ
49/54