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參數(shù)資料
| 型號： | TPS40101RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | PLASTIC, QFN-24 |
| 文件頁數(shù)： | 13/37頁 |
| 文件大小： | 774K |
| 代理商： | TPS40101RGET |
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R
F1 +
L
R
LDC(Tbase)
C
FLT
a
(W)
(13)
R
LDC(T1) + RLDC(Tbase)
R
REL(effT1)
(W)
(14)
R
LDC(T2) + RLDC(Tbase)
R
REL(effT2)
(W)
(15)
R
THE(T1) +
a
R
LDC(Tbase)
R
F1
R
LDC(T1) * a
R
LDC(Tbase)
(W)
(16)
R
THE(T2) +
a
R
LDC(Tbase)
R
F1
R
LDC(T2) * a
R
LDC(Tbase)
(W)
(17)
a
+ 1 *
R
NTC(T1) * RNTC(T2)
R
THE(T1) * RTHE(T2)
(dimensionless)
(18)
b
+ RNTC(T1) ) RNTC(T2) (W)
(19)
c
+ RNTC(T1)
R
NTC(T2) (W
2)
(20)
R
F3 +
* b " b2 * 4ac
2a
(W)
(21)
R
F2 +
R
THE(T1)
R
F3 ) RNTC(T1) * RF3
R
NTC(T1)
R
F3 ) RNTC(T1)
(W)
(22)
Setting the Current Sense Amplifier Gain
R
GM +
3
43.443
gm
CSA
2 ) 0.01543 gm
CSA ) 3.225
10*6
(W)
(23)
SLUS726 – SEPTEMBER 2006
APPLICATION INFORMATION (continued)
where
L is the value of the output inductance (H)
C
FLT is the value of the current sense filter capacitor (F)
α is the attenuation ratio chosen from Equation 11
R
THE(T1), RTHE(T2) are the equivalent resistances of the RTHE network at temperatures T1 and T2
R
LDC(Tbase) is the DC resistance of the inductor at temperature TBASE in
R
LDC(T1), RLDC(T2) are the inductor resistances at temperatures T1 and T2
R
REL(effT1), RREL(effT2), are the relative resistances of the inductor at T1 and T2 vs. Tbase
R
NCT(T1), RNTC(T2) are the effective resistance of the NTC thermistor at temperatures T1 and T2
The amplifier is a transconductance type and its gain is a set by connecting a resistor from the GM pin to GND:
where
R
GM is the resistor that sets the gain of the amplifier ()
gm
CSA is the gain of the current sense amplifier (S)
The value of the sense amplifier gain should be less than 1000
S, and more than 250 S, with the resulting
gain setting resistor greater than 50 k
. As a suggested starting point, set the gain of the current sense amplifier
to a nominal 400
S with R
GM of 182 k. This value should accommodate most applications adequately.
Figure 27 shows the current sense amplifier gain setting resistance vs. the sense amplifier gain.
20
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