參數(shù)資料
型號(hào)： L6919CD
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28
封裝： SO-28
文件頁(yè)數(shù)： 4/32頁(yè)
文件大?。?/td> 558K
代理商： L6919CD
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 (IFB
=IINFO1 +IINFO2) and the average current for each phase (IAVG =(IINFO1 +IINFO2)/2 ) is taken. IINFOX is then com-
pared to IAVG 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
A per phase at
full nominal load; the over current intervention threshold is set at 140% of the nominal (IINFOx = 35A). According
to the above relationship, the over current threshold (IOCPx) 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 IOCPx (IINFOx > 35A).
Introducing now the maximum ON time dependence with the delivered current (where T is the switching period
T=1/fSW):
This linear dependence has a value at zero load of 0.80T and at maximum current of 0.40T typical and results
in two different behaviors of the device:
1. TON Limited Output Voltage.
This happens when the maximum ON time is reached before the current in each phase reaches IOCPx (IINFOx
< 35
A).
Figure 6a shows the maximum output voltage that the device is able to regulate considering the TON limitation
imposed by the previous relationship. If the desired output characteristic crosses the TON 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 IFB = 70A.
Figure 6. TON Limited Operation
I
IN FO x
R
SENSE
I
PHASE
R
g
----------------------------------------------
=
I
OCPx
35
ARg
R
SEN SE
---------------------------
=
Rg
I
OC P x
R
SE NSE
35
A
-------------------------------------------
=
T
ON,MAX
0.80
I
FB
5.73 k
() T
–
0.80
R
SENSE
Rg
----------------------
I
OUT
5.73k
T
0.80 T I
FB
0
A
=
0.40 T I
FB
70
A
=
–
==
a) Maximum output Voltage
b) TON Limited Output Voltage
0.80VIN
0.40VIN
VOUT
IOUT
IOCP=2IOCPx
(IFB=70A)
TON Limited Output
characteristic
0.80VIN
0.40VIN
VOUT
IOUT
IOCP=2IOCPx
(IFB=70A)
Desired Output
characteristic and
UVP threshold
Resulting Output
characteristic
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