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參數(shù)資料
| 型號(hào)： | TPS65140RGE |
| 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)： | 14/24頁 |
| 文件大?。?/td> | 865K |
| 代理商： | TPS65140RGE |
www.ti.com
Converter Loop Design and Stability
Design Procedure Quick Steps
1. Select the feedback resistor divider to set the output voltage.
2. Select the feedforward capacitor to place a zero at 50 kHz.
3. Select the compensation capacitor on pin COMP. The smaller the value, the higher the low frequency gain.
4. Use a 50-k
potentiometer in series to C
and monitor V
during load transients. Fine tune the load
transient by adjusting the potentiometer. Select a resistor value that comes closest to the potentiometer
resistor value. This needs to be done at the highest V
in
and highest load current because stability is most
critical at these conditions.
Setting the Output Voltage and Selecting the Feedforward Capacitor
Vout
1.146 V
1
R1
R2
SW
SW
FB1
SUP
C2+
C2/MODE
D1
C8
6.8 pF
R1
430 k
R2
56 k
C4
22
μ
F
V
O
1
Up to 10 V/150 mA
C2
0.22
μ
F
C8
1
2
fz
R1
1
2
50 kHz
R1
TPS65140
TPS65145
SLVS497B–SEPTEMBER 2003–REVISED MARCH 2004
The TPS65140/45 converter loop can be externally compensated and allows access to the internal
transconductance error amplifier output at the COMP pin. A small feedforward capacitor across the upper
feedback resistor divider speeds up the circuit as well. To test the converter stability and load transient
performance of the converter, a load step from 50 mA to 250 mA is applied and the output voltage of the
converter is monitored. Applying load steps to the converter output is a good tool to judge the stability of such a
boost converter.
The output voltage is set by the external resistor divider and is calculated as:
Across the upper resistor, a bypass capacitor is required to speed up the circuit during load transients as shown
in Figure 15.
Figure 15. Feedforward Capacitor
Together with R1 the bypass capacitor C8 sets a zero in the control loop at approximately 50 kHz:
A value closest to the calculated value should be used. Larger feedforward capacitor values reduce the load
regulation of the converter and cause load steps as shown in Figure 16.
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65140RGER | 功能描述:LCD 驅(qū)動(dòng)器 Trp-Ch 2.1-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(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 |
| TPS65140RGERG4 | 功能描述:LCD 驅(qū)動(dòng)器 Trp-Ch 2.1-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(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 |
| TPS65141PWP | 功能描述:LCD 驅(qū)動(dòng)器 5V/1.6A(I/O) 4-CH Multi-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(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 |
| TPS65141PWPG4 | 功能描述:LCD 驅(qū)動(dòng)器 5V/1.6A(I/O) 4-CH Multi-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(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 |
| TPS65141PWPR | 功能描述:LCD 驅(qū)動(dòng)器 5V/1.6A(I/O) 4-CH Multi-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(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 |
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