STEVAL-ISA025V1 STMicroelectronics, STEVAL-ISA025V1 Datasheet - Page 14

• Manufacturer Part Number: STEVAL-ISA025V1
• Description: EVAL BOARD 30A 400KHZ L6730
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA025V1

• Design Resources: STEVAL-ISA025V1 Gerber Files STEVAL-ISA025V1 Schematic STEVAL-ISA025V1 Bill of Materials
• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3.3V
• Current - Output: 30A
• Voltage - Input: 4.5 ~ 14V
• Regulator Topology: Buck
• Frequency - Switching: 400kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6730
• Input Voltage: 4.5 V to 14 V
• Output Voltage: 3.3 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: L6730
• 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: L6730
• Other names: 497-5868

Device description
5
5.1
14/52
Device description
Oscillator
The switching frequency is internally fixed to 400 kHz. The internal oscillator generates the
triangular waveform for the PWM charging and discharging an internal capacitor (F
kHz). This current can be varied using an external resistor (R
and GND or V
maintained at fixed voltage (typ. 1.2 V), the frequency is increased (or decreased)
proportionally to the current sunk (sourced) from (into) the pin. In particular by connecting
R
following relationship:
Connecting R
to the following relationship:
Switching frequency variation vs. R
Figure 4.
T
versus GND the frequency is increased (current is sunk from the pin), according to the
Switching frequency variation versus RT
1500
1400
1300
1200
1100
1000
T
CCDR
900
800
700
600
500
400
300
200
100
to V
0
CCDR
in order to change the switching frequency. Since the OSC pin is
Rosc connected to GND
100
reduces the frequency (current is sourced into the pin), according
Fsw
Fsw
200
Doc ID 11938 Rev 3
=
=
400
400
T
300
is shown in
KHz
KHz
+
−
400
Rosc (KOHM)
R
Rosc connected to Vccdr
R
. 9
. 3
OSC
OSC
88
01
(
500
(
Figure
⋅
⋅
K
10
K
10
Ω
Ω
6
7
)
)
600
4.
(1)
(2)
T
700
) connected between OSC pin
800
900 1000
L6730 - L6730B
SW
= 400