STEVAL-ISA024V1 STMicroelectronics, STEVAL-ISA024V1 Datasheet - Page 11
![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
L6725 - L6725A
5.3
Figure 3.
5.4
Bypassing the LDO to avoid the voltage drop with low Vcc
If V
maximum LDO output current is about 100mA and so the output voltage drop is 100mV, to
avoid this the LDO can be bypassed.
Internal and external references
It is possible to set the internal/external reference and the switching frequency by setting the
proper voltage at the EAREF pin. The maximum value of the external reference depends on the
V
maximum external reference is 2.5V (typ.).
●
●
●
Providing an external reference from 0V to 450mV the output voltage will be regulated but
some restrictions must be considered:
●
●
To set the resistor divider it must be considered that a 100K pull-down resistor is integrated into
the device (see
pin is captured by the device at the start-up when V
CC
Bypassing the LDO
CC
: with V
V
V
V
The minimum OVP threshold is set at 300mV;
The under-voltage-protection doesn't work;
≈
EAREF
EAREF
EAREF
5V the internal LDO works in dropout with an output resistance of about 1Ω. The
CC
from 0% to 80% of V
from 80% to 95% of V
from 95% to 100% of V
= 4V the clamp operates at about 2V (typ.), while with V
Figure
4.). Finally it must be taken into account that the voltage at the EAREF
CCDR
CCDR
CCDR
-> External reference/Fsw = 250KHz
-> V
-> V
REF
REF
= 0.6V/Fsw = 500KHz
= 0.6V/Fsw = 250KHz
CC
is about 4V.
CC
greater than 5V the
Device description
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