STEVAL-ISA024V1 STMicroelectronics, STEVAL-ISA024V1 Datasheet - Page 18
![EVAL BOARD 20A 250KHZ L6725](/photos/9/14/91491/steval-isa024v1_sml.jpg)
STEVAL-ISA024V1
Manufacturer Part Number
STEVAL-ISA024V1
Description
EVAL BOARD 20A 250KHZ L6725
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA024V1
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
3.3V
Current - Output
20A
Voltage - Input
4.5 ~ 14V
Regulator Topology
Buck
Frequency - Switching
250kHz
Board Type
Fully Populated
Utilized Ic / Part
L6725
Input Voltage
4.5 V to 14 V
Output Voltage
3.3 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
L6725
Kit Application Type
Power Management - Voltage Regulator
Rohs Compliant
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
L6725
Other names
497-5867
Application details
6
6.1
Figure 13. Inductor current ripple.
18/32
Application details
Inductor design
The inductance value is defined by a compromise between the transient response time, the
efficiency, the cost and the size. The inductor has to be calculated to sustain the output and the
input voltage variation to maintain the ripple current (ÄI
maximum output current. The inductance value can be calculated with the following
relationship:
Where F
Figure 13
V
Increasing the value of the inductance reduces the ripple current but, at the same time,
increases the converter response time to a load transient. If the compensation network is well
designed, during a load transient the device is able to set the duty cycle to 100% or to 0%.
When one of these conditions is reached, the response time is limited by the time required to
change the inductor current. During this time the output current is supplied by the output
capacitors. Minimizing the response time can minimize the output capacitor size.
IN
= 5V and V
8
7
6
5
4
3
2
1
0
SW
0
shows the ripple current vs. the output voltage for different values of the inductor, with
is the switching frequency, V
IN
= 12V at a switching frequency of 500KHz.
1
O UT P UT V O L T AG E (V )
L
≅
2
Vin
Fsw
−
∆ ⋅
Vout
IN
I
L
is the input voltage and V
⋅
3
Vout
Vin
(2)
L
) between 20% and 30% of the
4
Vin=5V, L=500nH
Vin=12V, L=1uH
Vin=5V, L=1.5uH
Vin=12V, L=2uH
OUT
is the output voltage.
L6725 - L6725A