STEVAL-ISA026V1 STMicroelectronics, STEVAL-ISA026V1 Datasheet - Page 13

• 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

L6732
5.5
5.6
Error amplifier
Figure 5.
Soft-start
When both V
pin) the start-up phase takes place. Otherwise the SS pin is internally shorted to GND. At
start-up, a ramp is generated charging the external capacitor C
generator. The initial value for this current is 35 µA and charges the capacitor up to 0.5 V.
After that it becomes 10 µA until the final charge value of approximately 4 V (see
The output of the error amplifier is clamped with this voltage (V
programmed value. No switching activity is observable if V
MOSFETs are OFF. When V
on because the comp signal is lower than the valley of the triangular wave and so the duty-
cycle is 0 %. As V
high-side MOSFET begins to switch and the output voltage starts to increase. The L6732
can only source current during the soft-start phase in order to manage the pre-bias start-up
applications. This means that when the start-up occurs with output voltage greater than 0V
(pre-bias startup), even when Vss is between 0.5 V and 1.1 V the low-side MOSFET is kept
OFF (see
Figure 7
Error amplifier reference
CC
and V
SS
and
reaches 1.1 V (i.e. the oscillator triangular wave inferior limit) even the
IN
Figure
are above their turn-ON thresholds (V
SS
8).
is between 0.5 V and 1.1 V the low-side MOSFET is turned
SS
is lower than 0.5 V and both
IN
SS
SS
is monitored by the OCH
) until it reaches the
with an internal current
Device description
Figure
13/37
6).