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參數(shù)資料
| 型號： | TPS9103PW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | POWER SUPPLY FOR GaAs POWER AMPLIFIERS |
| 中文描述： | 電源供應(yīng)器的GaAs功率放大器 |
| 文件頁數(shù)： | 20/22頁 |
| 文件大?。?/td> | 341K |
| 代理商： | TPS9103PW |
TPS9103
POWER SUPPLY FOR GaAs POWER AMPLIFIERS
SLVS131A – OCTOBER 1995 – REVISED JULY 1996
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
dimensioning the external voltage divider
Drain voltage should only be applied to the power amplifier when the complete negative voltage from the
GATE_BIAS output is provided to the gate of the GaAs power amplifier. For that reason there is an internal
voltage divider R/0.6R and a PG comparator in the TPS9103 (see Figure 15). When the voltage at the inverting
input of the comparator reaches zero, the output goes high and the high-side MOSFET switches on, provided
a SW_EN high signal is applied. For example, when the supply voltage at V
DD
is 5 V, the high-side switch is
switched on when the voltage at GATE_BIAS reaches –3 V.
This trip point can be changed to another value by using an external voltage divider connected between V
DD
,
GATE_BIAS, and PGP. The resistor values should be low enough to minimize the error that is present when
the internal resistor values (typ R = 100 k
±
30%) are taken into consideration. Therefore, the external resistor
values, R1 and R2, are chosen within the 10-k
range.
R
0.6 R
PG Comparator
TPS9103
VDD
PGP
GATE_BIAS
R1
R2
Figure 18. External Voltage Divider for Setting the Trip Point
R1 = 10 k
. The value of R2 can then be calculated using:
R2
0.6
R
R1
Vtrip
Vtrip
0.6
VDD
[R1
R]
R1
where V
DD
= supply voltage, and V
trip
= chosen value to trip PG comparator.
The values of the internal resistor can vary about 30%, and can move the trip point. In a worst-case condition,
with a resistor variation of 30%, the shifting of the trip point can be calculated to:
Vtrip_point
VDD
R1
1.3
R1
R
0.6
R2
R2
0.78
R
R1
R
R1
0.6
R2
R2
0.6
R
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS9103PWR | 制造商:Rochester Electronics LLC 功能描述:POWER SUPPLY FOR GAAS POWER AMPLIFIERS - Bulk |
| TPS9103Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:POWER SUPPLY FOR GaAs POWER AMPLIFIERS |
| TPS9104 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CELLULAR SUBSCRIBER TERMINAL POWER SUPPLY/AUDIO SYSTEM |
| TPS9104IPT | 制造商:Rochester Electronics LLC 功能描述:LINBICMOS CELLULAR POWER SUPPLY/AUDIO SY - Tape and Reel |
| TPS9104IPTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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