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參數資料
| 型號： | TPS40101RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | PLASTIC, QFN-24 |
| 文件頁數： | 10/37頁 |
| 文件大小： | 774K |
| 代理商： | TPS40101RGET |
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R
REL(L) + 1 ) TCL
T
L * TBASE
(dimensionless)
(7)
gm
(REL) + 1 ) TCGM
T
IC * TBASE
(dimensionless)
(8)
T
IC * TBASE + TL * TBASE
k
THM
(9)
R
REL(eff) + RREL(L)
gm
REL + 1 ) TCL TL * TBASE
1
) kTHM
TC
GM
T
L * TBASE
(dimensionless)
SLUS726 – SEPTEMBER 2006
APPLICATION INFORMATION (continued)
The relative resistance change in the inductor is given by:
where
R
REL(L) is the relative resistance of the inductor at TL compared to the resistance at TBASE
TC
L is the temperature coefficient of copper, 4000 ppm/°C or 0.004
T
L is the inductor copper temperature (°C)
T
BASE is the reference temperature, typically lowest ambient (°C)
The relative gain of the current sense amplifier is given by a similar equation:
where
gm
(REL) is the relative gain of the amplifier at TIC compared to the gain at TBASE
TC
GM is the temperature coefficient of the amplifier gain, -2000 ppm/°C or -0.002
T
IC is the device junction temperature (°C)
T
BASE is the reference temperature, typically lowest ambient (°C)
The temperature rise of the device can usually be related to the temperature rise of the inductor. The
relationship between the two temperature rises can be approximated as a linear relationship in most cases:
where
T
IC is the device junction temperature (°C)
T
BASE is the reference temperature, typically lowest ambient (°C)
T
L is the inductor copper temperature (°C)
k
THM is the constant that relates device temperature rise to the inductor temperature rise and must be
determined experimentally for any given design
With these assumptions, the effective inductor resistance over temperature is:
(10)
RREL(eff) is the relative effective resistance that must be compensated for when doing the compensation. The
circuit of Figure 30 shows a method of compensating for thermal shifts in current limit. The NTC thermistor
(RNTC) must be well coupled to the inductor. CFLT should be located as close to the device as possible.
18
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