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)： 21/32頁(yè)
文件大?。?/td> 469K
代理商： TPS5211PWP
TPS5211
HIGH FREQUENCY PROGRAMMABLE HYSTERETIC
REGULATOR CONTROLLER
SLVS243 – SEPTEMBER 1999
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Control Section
Below are the equations needed to select the various components within the control section.
output voltage selection
The most important function of the power supply is to regulate the output voltage to a specific value. Values
between 1.3 V and 3.5 V can be easily set by shorting the correct VID inputs to ground. Values above the
maximum reference voltage (3.5 V) can be set by setting the reference voltage to any convenient voltage within
its range and selecting values for R2 and R3 to give the correct output. Select R3:
R3 << than V
REF
/I
BIAS(VSENSE)
; a recommended value is 10 k
Then, calculate R2 using:
V
O
V
REF
1
R2
R3
R2
R3
V
O
V
REF
V
REF
or
These equations are accurate if R2<<R11. If this condition is not fullfilled, the following equation must be used:
V
O
V
REF
1
R2 x R11
R3 x (R2
R11)
Another soultion is to use
0.1-
μ
F DC decoupling capacitor in series with R11. In such a case, R11 does not
influence the output voltage value.
R2 and R3 can also be used to make small adjusts to the output voltage within the reference-voltage range
and/or to adjust for load-current active droop compensation. If there is no need to adjust the output voltage, R3
can be eliminated. R2, R3 (if used), and C7 are used as a noise filter; calculate using:
C7
150 ns
R2
R3
slowstart timing
Slowstart reduces the startup stresses on the power-stage components and reduces the input current surge.
Slowstart timing is a function of the reference-voltage current (determined by R6) and is independent of the
reference voltage. The first step in setting slowstart timing will be to determine R6:
R6 should be between 7 k
and 300 k
, a recommended value is 20 k
.
Set the slowstart timing using the formula:
C5
t
SS
R
VREFB
5
t
SS
(5
R6)
Where C5
= Slowstart capacitance in
μ
F
t
SS
= Slowstart timing in
μ
s
R
VREFB
= Resistance from VREFB to GND in ohms (
≈
R6)
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