EVAL6730 STMicroelectronics, EVAL6730 Datasheet - Page 13
![EVAL BOARD FOR L6730XX](/photos/9/30/93060/eval6730_sml.jpg)
EVAL6730
Manufacturer Part Number
EVAL6730
Description
EVAL BOARD FOR L6730XX
Manufacturer
STMicroelectronics
Type
Motor / Motion Controllers & Driversr
Datasheets
1.L6730TR.pdf
(52 pages)
2.L6730DTR.pdf
(50 pages)
3.EVAL6730.pdf
(9 pages)
4.EVAL6732.pdf
(43 pages)
Specifications of EVAL6730
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Power - Output
66W
Voltage - Output
3.3V
Current - Output
20A
Voltage - Input
4.5 ~ 14V
Regulator Topology
Buck
Frequency - Switching
400kHz
Board Type
Fully Populated
Utilized Ic / Part
L6730
Input Voltage
8 V to 52 V
Product
Power Management Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
L6208
Other names
497-5501
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L6730C - L6730D
5
5.1
Figure 3.
Device description
Oscillator
The switching frequency is internally fixed to 400KHz. The internal oscillator generates the
triangular waveform for the PWM charging and discharging an internal capacitor (F
400KHz). This current can be varied using an external resistor (R
pin and GND or V
maintained at fixed voltage (typ. 1.2V), the frequency is increased (decreased) proportionally to
the current sunk (sourced) from (into) the pin. In particular, connecting R
frequency is increased (current is sunk from the pin), according to the following relationship:
Connecting R
the following relationship:
Switching frequency variation vs. R
Switching frequency variation versus R
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
T
to V
Rosc connected to GND
CCDR
100
CCDR
in order to change the switching frequency. Since the OSC pin is
Fsw
Fsw
200
the frequency is reduced (current is sourced into the pin), according to
400
300
400
T
KHz
KHz
is shown in
Rosc connected to Vccdr
400
Rosc (KOHM)
R
. 9
R
. 3
OSC
500
T
OSC
88
.
01
(
(
Figure
K
10
K
10
600
6
7
)
)
3..
(1)
(2)
700
800
T
) connected between OSC
900 1000
T
versus GND the
Device description
SW
=
13/50