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| 型号： | TPS65100QPWPRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | PLASTIC, TSSOP-24 |
| 文件页数： | 8/25页 |
| 文件大小： | 620K |
| 代理商： | TPS65100QPWPRQ1 |
Compensation
VIN
COMP
RC
15 k
CC
1 nF
fz +
1
2
p
Cc
Rc
SLVS849 – JULY 2008 ....................................................................................................................................................................................................... www.ti.com
The regulator loop can be compensated by adjusting the external components connected to the COMP pin. The
COMP pin is connected to the output of the internal transconductance error amplifier. A typical compensation
scheme is shown in Figure 17.
Figure 17. Compensation Network
The compensation capacitor CC adjusts the low frequency gain and the resistor value adjusts the high frequency
gain. The formula below calculates at what frequency the resistor increases the high frequency gain.
Lower input voltages require a higher gain and therefore a lower compensation capacitor value. A good start is
CC = 1 nF for a 3.3-V input and CC = 2.2 nF for a 5-V input. If the device operates over the entire input voltage
range from 2.7 V to 5.8 V, a large compensation capacitor up to 10 nF is recommended. Figure 18 shows the
load transient with a larger compensation capacitor, and Figure 19 shows a smaller compensation capacitor.
Figure 18. Cc = 4.7 nF
Figure 19. Cc = 1 nF
Finally, Rc needs to be selected. A good practice is to use a 50-k potentiometer and adjust the potentiometer
for best load transient where no oscillations should occur. These tests have to be done at the highest Vin and
highest load current because converter stability is most critical under these conditions. Figure 20, Figure 21, and
16
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65100-Q1
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