STEVAL-ISA052V1 STMicroelectronics, STEVAL-ISA052V1 Datasheet - Page 47

• Manufacturer Part Number: STEVAL-ISA052V1
• Description: KIT EVAL PM6675S HE CTLR 2A REG
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISA052V1

• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 1.5V, 0.6 ~ 3.3V
• Current - Output: 10A, 2A
• Voltage - Input: 4.5 ~ 28 V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: PM6675
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-8426

PM6675S
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 49. Integrative compensation
The stability of the system firstly depends on the output capacitor zero frequency. It must be
verified that:
Equation 49
where k is a free design parameter greater than unity (k > 3) . It determines the minimum
integrator capacitor value C
Equation 50
If the ripple on the COMP pin is greater than the integrator output dynamic (150 mV), an
additional capacitor C
attenuation factor of the output ripple, select:
COMP
C
FILT
filt
INT
could be added in order to reduce its amplitude. If q is the desired
R
capacitor.
INT
Vr=0.9
V
INT
V
REF
:
C
f
INT
SW
Integrator
C
Ton One-shot
INT
>
generator
>
Comparator
2
k
+
-
⋅ π
⋅
PWM
f
Zout
g
⎛
⎜
⎝
m
f
SW
k
g
+
-
=
m
−
2
⋅ π
f
Zout
R
VREF
0.6V
k
out
⎞
⎟
⎠
⋅
C
Vref
Vo
out
VSNS
Application information
VOUT
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