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參數(shù)資料
| 型號： | L6917BDTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER |
| 中文描述： | 5位可編程雙相控制器 |
| 文件頁數(shù)： | 11/27頁 |
| 文件大?。?/td> | 411K |
| 代理商： | L6917BDTR |
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11/27
L6917
CurrentReading and OverCurrent
The current flowing trough each phase is read using the voltage drop across the low side mosfets r
DSON
or
across a sense resistor (R
SENSE
) and internally converted into a current. The transconductance ratio is issued
by the external resistor Rg placed outside the chipbetween ISENx and PGNDSx pins toward the reading points.
The full differential current reading rejects noise and allows to place sensing element in different locations with-
out affecting the measurement’s accuracy. The current reading circuitry reads the current during the time in
which the low-side mosfet is on (OFF Time). During this time, the reaction keeps the pin ISENx and PGNDSx
at the same voltage while during the time in which the reading circuitry is off, an internal clamp keeps these two
pins at the same voltage sinking from the ISENx pin the necessary current.
The proprietary current reading circuit allows a very precise and high bandwidth reading for both positive and
negative current. This circuit reproduces the current flowing through the sensing element using a high speed
Track & Hold transconductance amplifier. In particular, it reads the current during the second half of the OFF
time reducing noise injection into the device due to the mosfet turn-on (See fig. 4).
Figure 4.
This circuit sources a constant 50
μ
A current from the PGNDSx pin and keeps the pins ISENx and PGNDSx at
the same voltage. Referring to figure 4, the current that flows in the ISENx pin is then given by the following
equation:
R
I
R
g
Where R
SENSE
is an external sense resistor or the r
dson
, on of the low side mosfet and Rg is the transconduc-
tance 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 compared to I
AVG
to give the correction to the PWM output in order to equalize the current carried by the two phases.
R
S
Rg
50
A
I
ISENx
I
P
Rg
LGATEX
ISENX
PGNDSX
I
LS1
I
LS2
Track & Hold
Total current
information
I
ISENx
50
μ
A
----------------------------------------------
+
50
μ
A
I
INFOx
+
=
=
I
INFOx
R
g
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