EVAL6730 STMicroelectronics, EVAL6730 Datasheet - Page 22
![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
AN1451 APPLICATION NOTE
2.13.1 Maximum output current vs. selectable devices
Figure 22 reports a performance comparison between L6228 (std. power) and L6208 (high power) for different
packages, with the following assumptions:
- Normal Drive Mode (two-phase on)
- Supply voltage: 24 V; Switching frequency: 30 kHz.
- T
- Maximum R
- Maximum quiescent current I
- PCB is a FR4 with a dissipating copper surface on the top side of 6 cm
SO and PowerDIP packages (D, N suffixes).
- PCB is a FR4 with a dissipating copper surface on the top side of 6 cm
via holes and a ground layer for the PowerSO package (PD suffix).
- For each device (on the x axis) y axis reports the maximum output current.
Figure 22. Maximum output current vs. selectable devices.
2.13.2 Power Dissipation Formulae for different sequences
Figure 23 to Figure 26 are screenshots of a spreadsheet that helps calculating power dissipation in specified
conditions (application and motor data), and estimates the resulting junction temperature for a given package
and copper area available on the PCB [6]. The model considers power dissipation during the on-time and the
off-time, taking into account the selected decay, rise and fall time (when a phase change occurs) considering
the operating sequence, the switching losses and the quiescent current power dissipation.
22/43
Load Current
amb
[A]
= 25 °C, T
DS(ON)
1 .7 0
1 .5 0
1 .3 0
1 .1 0
0 .9 0
0 .7 0
0 .5 0
J
= 125 °C.
(taking into account process spread) has been considered, @ 125 °C.
Q
(taking into account process spread) has been considered.
2
2
(with a thickness of 35 µm), 16
(with a thickness of 35 µm) for