參數(shù)資料
型號(hào)： TPS5211PWP
廠商： Texas Instruments, Inc.
英文描述： HIGH FREQUENCY PROGRAMMABLE HYSTERETIC REGULATOR CONTROLLER
中文描述： 可編程滯高頻穩(wěn)壓控制器
文件頁(yè)數(shù)： 23/32頁(yè)
文件大?。?/td> 469K
代理商： TPS5211PWP
TPS5211
HIGH FREQUENCY PROGRAMMABLE HYSTERETIC
REGULATOR CONTROLLER
SLVS243 – SEPTEMBER 1999
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
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
Active voltage droop positioning 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).
droop compensation (continued)
Then, calculate R9:
R9
V
IOUT(Max)
V
DROOP
1
R10
Where V
DROOP
= Desired droop voltage
At full load, the output voltage will be:
V
O
V
REF
1
R2
R3
V
DROOP
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