STEVAL-ISA052V1 STMicroelectronics, STEVAL-ISA052V1 Datasheet - Page 42

• 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
8.1.3
42/53
It must be taken into account that in some MLCC the capacitance decreases when the
operating voltage is near the rated voltage. In
applications are listed.
Table 12.
Output capacitor selection
Using tantalum or electrolytic capacitors, the selection is made referring to ESR and voltage
rating rather than by a specific capacitance value.
The output capacitor has to satisfy the output voltage ripple requirements. At a given
switching frequency, small inductor values are useful to reduce the size of the choke but
increase the inductor current ripple. Thus, to reduce the output voltage ripple a low ESR
capacitor is required.
To reduce jitter noise between different switching regulators in the system, it is preferable to
work with an output voltage ripple greater than 25 mV.
Concerning the load transient requirements, the Equivalent Series Resistance (ESR) of the
output capacitor must satisfy the following relationship:
Equation 37
where V
In addition, the ESR must be high enough to meet stability requirements. The output
capacitor zero must be lower than the switching frequency:
Equation 38
TAIYO YUDEN UMK325BJ106KM-T
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
Manufacturer
TDK
RIPPLE
Evaluated MLCC for input filtering
is the maximum tolerable ripple voltage.
C3225X5R1E106M
GMK325F106ZH-T
GMK316F106ZL-T
GMK325BJ106KN
Series
f
SW
Capacitance (µF) Rated voltage (V)
ESR
>
f
Z
≤
=
10
10
10
10
10
V
2
RIPPLE
⋅ π
∆
Table 12
I
ESR
, L
MAX
1
,
MAX
⋅
C
some MLCC suitable for most of
out
50
35
35
35
25
Maximum Irms
@100 kHz (A)
2.2
2.5
2.2
2
PM6675S