參數(shù)資料
型號(hào)： TPS65171RHAR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40
封裝： 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40
文件頁數(shù)： 20/46頁
文件大?。?/td> 3644K
代理商： TPS65171RHAR
logic
OFFE_min
V
R21
V
=
1
= 1.65 V
1
, select R21 about 1 M
to achieve good soft-start.
2
R20
-
-
W
÷
÷
è
è
logic
OFFE_min
V
R21
3.3 V
R21
R20 =
=
V
2×V
3.3 V
2
V
-
OFFE_max
SET
logic
SET
R21
V
= V
(V
V
)
= V
(3.3V
V
)
, VSET is calculated below.
R20
-
-
OFFE_max
logic
OFFE_max
SET
V
R20 + V
R21
V
R20 + 3.3 V
R21
V
=
R20 + R21
SET
logic
R17
V
= V
= 3.3 V
, select R17 between 1 k
and 20 k
for good accuracy.
R16 + R17
W
logic
SET
V
3.3V
R16 = R17
1 = R17
1
V
-
-
÷
÷
÷
è
è
0
1
B×
T
NTC
T
R
(T) = R
e
-
÷
÷
è
NTC
B
2T
R18 = R
(T)
B + 2T
-
NTC
NTC||R18
NTC
R18
R
(T)
R
=
R18 + R
(T)
www.ti.com
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
Setting the Minimal and Maximal Output Voltage, VOFFE
Keep in mind that VOFFE has a negative value, while Vlogic and VSET have positive values:
(21)
(22)
(23)
(24)
(25)
(26)
Setting the Start and End Temperature of the Compensation
The resistance of a NTC termistor decreases nonlinearly with rising temperature.
(27)
Where,
RT0 is the resistance at an absolute temperature T0 in Kelvin (normally 25°C)
T is the temperature in Kelvin (°C + 273.15 K/°C)
B is a material constant
The NTC termistor manufacturer provides the above parameters. Typically a 22k
NTC is used. Table 9
provides a suggestion for NTCs.
Table 9. Negative Termistor Selection
RESISTANCE (25°C)
B CONSTANT
COMPONENT SUPPLIER
COMMENT
22k
3950 K
Murata, NCP18XW223E
±3%
22k
3800 K
Vishay, NTCS0805E3223FHT
±1%
22k
4554 K
TDK, NTCG164LH223HT
±3%
To linearize the resistance-temperature characteristic of the NTC termistor, a parallel resistor R18 is added. T is
the temperature at which the NTC characteristic curve is linearized. Typically T is located in the middle of the set
temperature range at which the VOFFE voltage should be adjusted. For example, if the temperature compensation
should start at 0°C and stop at 25°C T = 12.5°C + 273.15 K/°C = 285.65 K.
(28)
The resulting overall resistance RNTC||R18 can be calculated as follows.
(29)
Copyright 2009–2010, Texas Instruments Incorporated
27
Product Folder Link(s): TPS65171
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