參數(shù)資料
型號(hào)： TPS5211PWPR
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 23/29頁(yè)
文件大?。?/td> 500K
代理商： TPS5211PWPR
TPS5210
PROGRAMMABLE SYNCHRONOUS BUCK REGULATOR CONTROLLER
SLVS171A – SEPTEMBER 1998 – REVISED MAY 1999
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
current limit
Current limit can be implemented using the on-resistance of the upper FETs as the sensing elements. Select
R8:
(
100
)
≤
×
≤
<<
nA
V
100
I
V
R
OCP
(
Bias
OCP
10 k
1
8
)
(A recommended value is 1 k
)
The IOUT signal is used to drive the current limit and droop-circuit dividers. The voltage at IOUT at the output
current trip point will be:
(
)
I
NumFETs
TF
R
V
Trip
(
O
ON
(
DS
Trip
(
IOUT
)
)
)
2
×
×
×
=
Where NumFETS = Number of upper FETS in Parallel.
TF = R
DS(ON)
temperature correction factor.
I
O(Trip)
= Desired output current trip level (A).
Calculate R7 using:
R7
V
IOUT(Trip)
0.1 V
1
R8
Note that since R
DS(ON)
of MOSFETs can vary from lot to lot and with temperature, tight current-limit control (less
than 1.5 x I
O
) using this method is not practical. If tight control is required, an external current-sense resistor
in series with the drain of the upper FET can be used with HISENSE and LOSENSE connected across the
resistor.
droop compensation
Droop compensation is used to reduce the output voltage range during load transients by increasing the output
voltage setpoint toward the upper tolerance limit during light loads and decreasing the voltage setpoint toward
the lower tolerance limit during heavy loads. This allows the output voltage to swing a greater amount and still
remain within the tolerance window. The maximum droop voltage is set with R9 and R10. Select R10:
(
100
)
≤
×
≤
<<
nA
V
I
V
R
Max
,
DROOP
Bias
Min
DROOP
1 k
100
01
.
10
)
(
)
(
(Again, a value of 1 k
is recommended)
The voltage at IOUT during normal operation (0 to 100% load) will vary from 0 V up to:
(
)
I
NumFETs
TF
R
V
Max
O
ON
(
DS
Max
(
IOUT
)
(
)
)
2
×
×
×
=
Where I
O(Max)
= Maximum output load current (A).
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