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參數(shù)資料
| 型號(hào)： | TPS65105RGE |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND VCOM BUFFER |
| 中文描述： | 三路輸出液晶供應(yīng)線性穩(wěn)壓器和VCOM緩沖器 |
| 文件頁數(shù)： | 18/25頁 |
| 文件大?。?/td> | 816K |
| 代理商： | TPS65105RGE |
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
TPS65100
TPS65105
SLVS496B–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 dropout, 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.
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 heavily 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 the 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
))
18
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65105RGER | 功能描述:LCD 驅(qū)動(dòng)器 LCD Supply with Vcom Buffer RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)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 |
| TPS65105RGERG4 | 功能描述:LCD 驅(qū)動(dòng)器 LCD Supply with Vcom Buffer RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)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 |
| TPS65110RGE | 功能描述:電荷泵 Triple Chargepump for LTPS LCD RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| TPS65110RGEG3 | 功能描述:電荷泵 Triple Chargepump for LTPS LCD RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| TPS65110RGER | 功能描述:電荷泵 Triple Chargepump for LTPS LCD RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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