EVAL6730 STMicroelectronics, EVAL6730 Datasheet - Page 15

• Manufacturer Part Number: EVAL6730
• Description: EVAL BOARD FOR L6730XX
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

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

can not be smaller than the minimum on time t
2.11.1 Off-time Selection and minimum on-time
Figure 14 also shows the lower limit for the on time t
has to be said that t
smaller than t
stant.
So, small C
switching frequency), but, the smaller is the value for C
performance.
Figure 14. Off-time selection and minimum on-time.
t



RCRISE
t
t
O N
O N
OFF
>
>
RCRISE
t
t
= 600 · C
O N MIN
RCRISE
value gives more flexibility for the applications (allows smaller on time and, therefore, higher
ON
1 10
1 10
- t
is always bigger than t
OFF
DT
–
=
100
100
t
. In this last case the device continues to work but the off time t
DT
4
3
10
10
1.5 s (typ. value)
1
1
0.1
0.1
1
1
ON(MIN)
ON(MIN)
Coff [nF]
Coff [nF]
ON
.
because the device imposes this condition, but it can be
OFF
for having a good PWM current regulation capacity. It
, the more influential will be the noises on the circuit
10
10
AN1451 APPLICATION NOTE
100
100
R = 100 k
R = 47 k
R = 20 k
OFF
is not more con-
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