參數(shù)資料
型號(hào)： 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(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 865K
代理商： TPS65145RGE
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
TPS65145RGER 功能描述:LCD 驅(qū)動(dòng)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(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
TPS65145RGERG4 功能描述:LCD 驅(qū)動(dòng)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(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
TPS65146RGER 功能描述:LCD 驅(qū)動(dòng)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(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
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(bǔ)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(fēng)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube
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