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| 型号： | TPS65145RGERG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.56 A SWITCHING REGULATOR, 2100 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | GREEN, PLASTIC, QFN-24 |
| 文件页数： | 8/31页 |
| 文件大小： | 1391K |
| 代理商： | TPS65145RGERG4 |
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Load Step
Compensation
VIN
COMP
RC
15 k
CC
1 nF
fz +
1
2
p
Cc
Rc
CC = 4.7 nF
SLVS497C – SEPTEMBER 2003 – REVISED APRIL 2006
Figure 16. Load Step Caused By A Too Large Feedforward Capacitor Value
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 following formula calculates at what frequency the resistor increases the high frequency gain.
Lower input voltages require a higher gain and 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 larger 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
16
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