STEVAL-ISA051V2 STMicroelectronics, STEVAL-ISA051V2 Datasheet - Page 47
![BOARD EVAL PM6670AS DDR2/3](/photos/9/13/91339/steval-isa051v2_sml.jpg)
STEVAL-ISA051V2
Manufacturer Part Number
STEVAL-ISA051V2
Description
BOARD EVAL PM6670AS DDR2/3
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA051V2
Design Resources
STEVAL-ISA051V2 Gerber Files STEVAL-ISA051V2 Schematic STEVAL-ISA051V2 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 ~ 36V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
PM6670A
Input Voltage
4.5 V to 36 V
Output Voltage
1.8 V, 1.5 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
PM6670AS
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
PM6670AS
Other names
497-8412
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA051V2
Manufacturer:
STMicroelectronics
Quantity:
1
PM6670AS
8.1.7
All ceramic capacitors application
Design of external feedback network depends on the output voltage ripple across the output
capacitors' ESR. If the ripple is great enough (at least 20 mV), the compensation network
simply consists of a C
Figure 40. Integrative compensation
The stability of the system depends firstly on the output capacitor zero frequency. It must be
verified that:
Equation 48
where k is a free design parameter greater than unity (k > 3). It determines the minimum
integrator capacitor value C
Equation 49
COMP
C
FILT
R
INT
INT
VREF
capacitor.
INT
Doc ID 14436 Rev 2
:
C
Integrator
C
f
INT
SW
Ton One-shot
INT
generator
>
>
Comparator
+
-
2
k
⋅ π
⋅
PWM
f
Zout
⎛
⎜
⎝
g
f
m
SW
k
g
=
+
m
-
−
2
⋅ π
f
Zout
R
k
out
⎞
⎟
⎠
Vr=0.9
⋅
C
Vref
Vo
out
Application information
VSNS
VDDQ
47/53