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参数资料
| 型号： | TPS40222DRPTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, VSON-6 |
| 文件页数： | 7/27页 |
| 文件大小： | 662K |
| 代理商： | TPS40222DRPTG4 |
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Input Filter Capacitor (C1)
Boost Capacitor (C2)
R2
C1
C2
C3
L1
R1
D1
D2
2
3
5
4
AVIN PVIN
FB
GND
SW
6
BOOST
UDG04132
VOUT
VIN
TPS40222
1
Boost Diode (D2)
Output Preload Requirement
AVIN Filtering
SW Node Snubber
SLUS642A – OCTOBER 2005 – REVISED JANUARY 2006
Select a good quality, low ESR ceramic capacitor to bypass the input. For a conservative design, the capacitor
should have a ripple current rating equal to the load current of the converter.
The boost capacitor is sized to ensure there is enough energy available to turn on the internal MOSFET. For
most applications, use a ceramic capacitor with a value between 33 nF and 100 nF.
Figure 13. Using a Boost Diode
For some applications, the internal bootstrap diode’s voltage drop may be too high to sufficiently charge the
boost capacitor each switching cycle. For these applications, a Schottky diode, D2 shown in Figure 13, may be
added.
One of the requirements for proper startup of the DC-to-DC converter is that the boost capacitor, C2, has
sufficient voltage across it before switching occurs. In some applications, notably those with output voltages of
3.3 V, and those with slowly rising or low input voltages, there is the need to add a small 10 mA, pre-load to the
converter to hold the SW node to GND before switching begins. Without a pre-load, the output voltage may not
reach regulation. In addition, the pre-load prevents the output from overshooting too much when the load is
stepped from a high value to zero.
Some applications may require the addition of an R-C filter on the input of AVIN to filter unwanted noise and
improve load regulation. (See Figure 14) Use R4=10
and C5=1 F. Connect the ground side of C5 as close as
possible to the GND pin of the device.
To attenuate excessive ringing at the SW node, an R-C network may be added across D1. (See Figure 14)
Use R3=10
and C4=680 pF as a starting point. Decrease C4 until the minimum capacitance is found for the
desired ringing attenuation.
15
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