STEVAL-ISA052V2 STMicroelectronics, STEVAL-ISA052V2 Datasheet - Page 28
![BOARD EVAL BASED ON PM6675A](/photos/9/13/91340/steval-isa052v2_sml.jpg)
STEVAL-ISA052V2
Manufacturer Part Number
STEVAL-ISA052V2
Description
BOARD EVAL BASED ON PM6675A
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA052V2
Design Resources
STEVAL-ISA052V2 Gerber Files STEVAL-ISA052V2 Schematic STEVAL-ISA052V2 Bill of Material
Main Purpose
DC/DC, Step Down with LDO
Outputs And Type
2, Non-Isolated
Voltage - Output
1.5V, 0.6 ~ 3.3V
Voltage - Input
4.5 ~ 36 V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
PM6675AS
Input Voltage
4.5 V to 36 V
Output Voltage
1.5 V
Product
Power Management Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Power - Output
-
Frequency - Switching
-
Lead Free Status / Rohs Status
Supplier Unconfirmed
For Use With/related Products
PM6675AS
Other names
497-8413
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA052V2
Manufacturer:
STMicroelectronics
Quantity:
1
Device description
7.1.6
28/48
POR, UVLO and soft-start
The PM6675AS automatically performs an internal startup sequence during the rising
phase of the analog supply of the device (AVCC). The switching controller remains in a
stand-by state until AVCC crosses the upper UVLO threshold (4.25 V typ.), keeping active
the internal discharge MOSFETs (only if AVCC > 1 V).
The soft-start allows a gradual increase of the internal current limit threshold during startup
reducing the input/output surge currents. At the beginning of start-up, the PM6675AS
current limit is set to 25 % of nominal value and the under voltage protection is disabled.
Then, the current limit threshold is sequentially brought to 100 % in four steps of
approximately 750 µs (figure 13).
Figure 31. Soft-start waveforms
After a fixed 3 ms total time, the soft-start finishes and UVP is released: if the output voltage
doesn't reach the under voltage lower threshold within soft-start duration, the UVP condition
is detected; the device performs a soft end and latches off. Depending on the load
conditions, the inductor current may or may not reach the nominal value of the current limit
(
Figure 32 on page 29
Switching output
shows two examples).
Current limit threshold
SWEN
Time
PM6675AS