EVAL6730 STMicroelectronics, EVAL6730 Datasheet - Page 18
![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
Device description
18/52
The output of the error amplifier is clamped with this voltage (Vss) until it reaches the
programmed value. No switching activity is observable if V
MOSFETs are off. When Vss is between 0.5 V and 1.1 V the low-side MOSFET is turned on
because the output of the error amplifier is lower than the valley of the triangular wave and
so the duty-cycle is 0%. As V
limit) even the high-side MOSFET begins to switch and the output voltage starts to increase.
The L6730 - L6730B can only source current during the soft-start phase in order to manage
the pre-bias start-up applications. This means that when the startup 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 9.
Figure 10. Start-up with pre-bias
The L6730B can always sink current and so it can be used to supply the DDR memory
termination BUS. If overcurrent is detected during the soft-start phase, the device provides
constant current-protection. In case there is short soft-start time and/or small inductor value
and/or high output capacitors value and thus, in case of high ripple current during the soft-
start, the converter can start-up in anyway and limit the current
Start-up without pre-bias
SS
Doc ID 11938 Rev 3
reaches 1.1 V (i.e. the oscillator triangular wave inferior
Figure 9
and
Figure
10).
SS
is lower than 0.5 V and both
(Chapter 5.8: Monitoring and
LGate
V
V
LGate
V
I
SS
V
OUT
L
OUT
SS
I
L
L6730 - L6730B