L6911C View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6911C' PDF : 20 Pages View PDF
L6911C
Efficiency
Figure 11 shows the measured efficiency versus load current for different values of output voltage. The measure
was done at Vin=5V for different values of the output voltage (2.05V and 2.75V). Two different measurements
were done using IC supply voltage of 5V and 12V.
In the application two mosfets STS12NF30L (30V, 10mΩ typ @ Vgs=4.5V) connected in parallel are used for
both the low and the high side.
The board has been layed out with the possibility to use up to three SO8 mosfets for both high and low side
switch. Two D2PACK mosfets (one for each high and low side) may also be used in order to allow the maximum
flexibility in meeting different requirements.
Figure 11. Efficiency vs. load
95
90
85
80
75
70
Vout = 1.7V
65
Vout = 2.0V
60
Vout = 2.5V
55
0
2
4
6
8
10
12
14
16
Out put Current [A]
Vcc = 12V; Vin = 5V
95
90
85
80
75
70
Vout = 1.7V
65
Vout = 2.0V
60
Vout = 2.5V
55
0
2
4
6
8
10
12
14
16
Out put C ur r en t [ A ]
Vcc = Vin = 5V
Load Transient Response
Figure 12 shows the demo board response to a load
transient application. The load transient applied
changes from 0A to 14A on the output current (Chan-
nel 4). It may be observed that output voltage (Chan-
nel 1) remains within the 100mV tolerance across the
regulated voltage. Figure 13 shows details about the
the circuit response during current rising and falling
edge; it is possible to observe that the duty cycle of
the Phase signal (Channel 2) goes up to 100% or
down to 0% if necessary.
Figure 12. Load Transient Response
Figure 13. Load Transient Response Details
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