STEVAL-ISA052V1 STMicroelectronics, STEVAL-ISA052V1 Datasheet - Page 48

• 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

Application information
48/53
Equation 51
In order to reduce noise on the COMP pin, it's possible to introduce a resistor R
together with C
much greater (10 or more times) than the switching frequency:
Equation 52
For most applications both R
If the ripple is very small (e.g. such as with ceramic capacitors), a further 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 50. Virtual ESR network
Select C as shown:
Equation 53
Generation
Block
Figure 50
Ton
INT
and C
.
filt
, becomes a low pass filter. The cutoff frequency f
INT
PWM Comparator
R
and C
INT
+
-
C
=
filt
filt
2
⋅ π
C
Vr
V
are unnecessary.
=
REF
>
f
C
CUT
5
INT
⋅
C
C
C
⋅
q
INT
1
R
1 (
INT
INT
INT
C
−
C
FILT
+
) q
⋅
INT
C
C
FILT
FILT
Integrator
g
R
m
+
-
L
C
R1
1.237V
0.6V
VOUT
CUT
INT
must be
PM6675S
that,