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參數(shù)資料
| 型號： | L6919CD |
| 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 |
| 文件頁數(shù)： | 12/32頁 |
| 文件大小： | 558K |
| 代理商： | L6919CD |
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L6919C
12/32
follow:
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:
1. T
ON
Limited Output Voltage.
This happens when the maximum ON time is reached before the current in each phase reaches I
OCPx
(I
INFOx
< 35
μ
A).
Figure 6a shows the maximum output voltage that the device is able to regulate considering the T
ON
limitation
imposed by the previous relationship. If the desired output characteristic crosses the T
ON
limited maximum output
voltage, the output resulting voltage will start to drop after crossing. In this case, the device doesn't perform con-
stant current limitation but only limits the maximum ON time following the previous relationship. The output volt-
age follows the resulting characteristic (dotted in Figure 6b) until UVP is detected or anyway until I
FB
= 70
μ
A.
Figure 6. T
ON
Limited Operation
I
INFOx
R
I
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
=
–
=
=
a) Maximum output Voltage
b) T
ON
Limited Output Voltage
0.80·V
IN
0.40·V
IN
V
OUT
I
OUT
I
OCP
=2·I
OCPx
(I
FB
=70
μ
T
ON
Limited Output
characteristic
0.80·V
IN
0.40·V
IN
V
OUT
I
OUT
I
OCP
=2·I
OCPx
(I
FB
=70
μ
Desired Output
characteristic and
UVP threshold
Resulting Output
characteristic
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