STEVAL-ISA052V2 STMicroelectronics, STEVAL-ISA052V2 Datasheet - Page 26

• 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

Device description
7.1.4
26/48
Mode-of-operation selection
Figure 29. VSEL and NOSKIP multifunction pin configurations
The PM6675AS has been designed to satisfy the widest range of applications. The device is
provided of some multilevel pins which allow the user to choose the appropriate
configuration. The VSEL pin is used to firstly decide between fixed preset or adjustable
(user defined) output voltages.
When the VSEL pin is connected to +5 V, the PM6675AS set the switching section output
voltage to 1.5 V without the need of an external divider.
Applications requiring different output voltages can be managed by PM6675AS simply
setting the adjustable mode. If the VSEL pin voltage is higher than 4 V, the fixed output
mode is selected. Connecting an external divider to the VSEL pin, it is used as negative
input of the error amplifier and the output voltage is given by expression (20).
Equation 20
The output voltage can be set in the range from 0.6 V to 3.3 V.
The NOSKIP is the power saving algorithm selector: if tied to +5 V, the forced-PWM (fixed
frequency) control is performed. If grounded or connected to VREF pin (1.237 V reference
voltage), the Pulse-Skip or Non-Audible Pulse-Skip Modes are respectively selected.
Table 8.
V
V
VSEL
VSEL
VSEL
> 4.3V
< 3.7V
Mode-of-operation settings summary
R8
R9
VOUT
1 V < V
1V < V
V
V
V
NOSKI P
NOSKIP
NOSKIP
NOSKIP
NOSKIP
V
< 0.5 V
NOSKIP
REF
> 4.2 V
< 0.5 V
VOUT
> 4.2 V
< 3.5 V
< 3.5 V
+5V
ADJ
=
0
6 .
VOUT
1.5 V
ADJ
⋅
NOSKIP
VSEL
R
8
PM6675AS
R
+
8
R
9
Non-Audible Pulse-skip
Non-Audible Pulse-skip
Operating mode
Forced-PWM
Forced-PWM
Pulse-Skip
Pulse-Skip
PM6675AS