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参数资料
| 型号： | TPS65140PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 2100 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | GREEN, PLASTIC, HTSSOP-24 |
| 文件页数： | 7/31页 |
| 文件大小： | 1391K |
| 代理商： | TPS65140PWPG4 |
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Converter Loop Design and Stability
Design Procedure Quick Steps
Setting the Output Voltage and Selecting the Feedforward Capacitor
Vout + 1.146 V
1 )
R1
R2
SW
FB1
SUP
C2+
C2/MODE
D1
C8
6.8 pF
R1
430 k
R2
56 k
C4
22
F
VO1
Up to 10 V/150 mA
C2
0.22
F
C8 +
1
2
p
fz
R1
+
1
2
p
50 kHz
R1
SLVS497C – SEPTEMBER 2003 – REVISED APRIL 2006
The TPS6514x 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.
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
c and monitor Vout 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.
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.
15
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| TPS65140RGER | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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