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參數(shù)資料
| 型號： | TPS65145RGE |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD |
| 中文描述： | 三路輸出液晶供應(yīng)線性穩(wěn)壓器和電源良好 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 865K |
| 代理商： | TPS65145RGE |
www.ti.com
Vout
VREF
1
R3
R4
VREF
1.213 V
1
R3
R4
1.213 V
R3
R4
Vout
VREF
VREF
1
R4
Vout
1.213
1.213
1
TPS65140
TPS65145
SLVS497B–SEPTEMBER 2003–REVISED MARCH 2004
Figure 22. Optimum, R
C
Is Ideal
Negative Charge Pump
The negative charge pump provides a regulated output voltage by inverting the main output voltage, Vo1. The
negative charge pump output voltage is set with external feedback resistors.
The maximum load current of the negative charge pump depends on the voltage drop across the external
Schottky diodes, the internal on resistance of the charge pump MOSFETS Q8 and Q9, and the impedance of the
flying capacitor, C12. When the voltage drop across these components is larger than the voltage difference from
Vo1 to Vo2, the charge pump is in drop out, providing the maximum possible output current. Therefore, the
higher the voltage difference between Vo1 and Vo2, the higher the possible load current. See Figure 12 for the
possible output current versus boost converter voltage Vo1 and the calculations below.
Vout
min
= -(Vo1 - 2 V
D
- Io (2
×
r
DS(on)Q8
+ 2
×
r
DS(on)Q9
+ X
cfly
))
Setting the output voltage:
The lower feedback resistor value, R4, should be in a range between 40 k
to 120 k
or the overall feedback
resistance should be within 500 k
to 1 M
. Smaller values load the reference too heavy and larger values may
cause stability problems. The negative charge pump requires two external Schottky diodes. The peak current
rating of the Schottky diode has to be twice the load current of the output. For a 20 mA output current, the dual
Schottky diode BAT54 or similar is a good choice.
Positive Charge Pump
The positive charge pump can be operated in a voltage doubler mode or a voltage tripler mode depending on the
configuration of the C2+ and C2-/MODE pins. Leaving the C2+ pin open and connecting C2-/MODE to GND
forces the positive charge pump to operate in a voltage doubler mode. If higher output voltages are required the
positive charge pump can be operated as a voltage tripler. To operate the charge pump in the voltage tripler
mode, a flying capacitor needs to be connected to C2+ and C2-/MODE.
The maximum load current of the positive charge pump depends on the voltage drop across the internal Schottky
diodes, the internal on-resistance of the charge pump MOSFETS, and the impedance of the flying capacitor.
When the voltage drop across these components is larger than the voltage difference Vo1
×
2 to Vo3 (doubler
mode) or Vo1
×
3 to Vo3 (tripler mode), then the charge pump is in dropout, providing the maximum possible
output current. Therefore, the higher the voltage difference between Vo1
×
2 (doubler) or Vo1
×
3 (tripler) to Vo3,
the higher the possible load current. See Figure 13 and Figure 14 for output current versus boost converter
voltage, Vo1, and the following calculations.
Voltage doubler:
Vo3
max
= 2
×
Vo1 - (2 V
D
+ 2
×
Io
×
(2
×
r
DS(on)Q5
+ r
DS(on)Q3
+ r
DS(on)Q4
+ X
C1
))
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65145RGER | 功能描述:LCD 驅(qū)動器 Trp-Ch 1.3-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65145RGERG4 | 功能描述:LCD 驅(qū)動器 Trp-Ch 1.3-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65146RGER | 功能描述:LCD 驅(qū)動器 Compact LCD Bias IC for Notebook & Mon RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65148RHBR | 功能描述:LCD Gamma緩沖器 Compact TFT LCD Bias IC RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| TPS65148RHBT | 功能描述:LCD Gamma緩沖器 Compact TFT LCD Bias IC RoHS:否 制造商:Maxim Integrated 輸入補償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
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