STEVAL-ISA026V1 STMicroelectronics, STEVAL-ISA026V1 Datasheet - Page 22
![EVAL BOARD 20A 250KHZ L6732](/photos/9/13/91309/steval-isa026v1_sml.jpg)
STEVAL-ISA026V1
Manufacturer Part Number
STEVAL-ISA026V1
Description
EVAL BOARD 20A 250KHZ L6732
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA026V1
Design Resources
STEVAL-ISA026V1 Gerber Files STEVAL-ISA026V1 Schematic STEVAL-ISA026V1 Bill of Material
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
L6732
Input Voltage
4.5 V to 14 V
Output Voltage
3.3 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
L6732
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
L6732
Other names
497-5869
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA026V1
Manufacturer:
STMicroelectronics
Quantity:
135
Application details
6
6.1
22/37
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 (∆I
maximum output current. The inductance value can be calculated with the following
relationship:
Equation 6
Where F
voltage.
inductor, with V
Figure 17. Inductor current ripple
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.
8
7
6
5
4
3
2
1
0
Figure 17.
SW
0
is the switching frequency, V
IN
= 5 V and V
shows the ripple current vs. the output voltage for different values of the
1
O UT P UT V O L T AG E (V )
IN
= 12 V at a switching frequency of 500 kHz.
2
L
≅
Vin
Fsw
IN
−
is the input voltage and V
∆ ⋅
Vout
3
I
L
⋅
Vout
Vin
L
4
) between 20 % and 30 % of the
Vin=5V, L=500nH
Vin=12V, L=1uH
Vin=5V, L=1.5uH
Vin=12V, L=2uH
OUT
is the output
L6732