參數(shù)資料
型號(hào)： L6919ETR
廠商： 意法半導(dǎo)體
英文描述： 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
中文描述： 5位可編程雙相與動(dòng)態(tài)VID管理控制器
文件頁(yè)數(shù)： 11/33頁(yè)
文件大小： 606K
代理商： L6919ETR
11/33
L6919E
Figure 4. Current Reading Timing (Left) and Circuit (Right)
Where R
SENSE
is an external sense resistor or the rds,on of the low side mosfet and Rg is the transconductance
resistor used between ISENx and PGNDSx pins toward the reading points; I
PHASE
is the current carried by each
phase and, in particular, the current measured in the middle of the oscillator period
The current information reproduced internally is represented by the second term of the previous equation as
follow:
R
I
----------------------------------------------
=
Since the current is read in differential mode, also negative current information is kept; this allow the device to
check for dangerous returning current between the two phases assuring the complete equalization between the
phase's currents. From the current information of each phase, information about the total current delivered (I
FB
=I
INFO1
+I
INFO2
) and the average current for each phase (I
AVG
=(I
INFO1
+I
INFO2
)/2 ) is taken. I
INFOX
is then com-
pared to I
AVG
to give the correction to the PWM output in order to equalize the current carried by the two phases.
The transconductance resistor Rg can be designed in order to have current information of 25
μ
A per phase at
full nominal load; the over current intervention threshold is set at 140% of the nominal (I
INFOx
= 35
μ
A). According
to the above relationship, the over current threshold (I
OCPx
) for each phase, which has to be placed at one half
of the total delivered maximum current, results:
Since the device senses the output current across the low-side mosfets (or across a sense resistors in series
with them) the device limits the bottom of the inductor current triangular waveform: an over current is detected
when the current flowing into the sense element is greater than I
OCPx
(I
INFOx
> 35
μ
A).
Introducing now the maximum ON time dependence with the delivered current (where T is the switching period
T=1/f
SW
):
R
---------------------
I
OUT
5.73k
This linear dependence has a value at zero load of 0.80·T and at maximum current of 0.40·T typical and results
in two different behaviors of the device:
R
S
Rg
50
μ
A
I
ISENx
I
P
Rg
LGATEX
ISENX
PGNDSX
I
LS1
I
LS2
Track & Hold
Total current
information
I
INFOx
R
g
I
OCPx
R
SENSE
---------------------------
=
Rg
I
R
35
μ
A
------------------------------------------
=
T
ON,MAX
0.80
I
FB
5.73k
(
)
T
–
0.80
Rg
T
0.80 T I
FB
0.40 T I
FB
0
μ
A
=
70
μ
A
=
–
=
=
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