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参数资料
| 型号： | TPS5431DDA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, SOP-8 |
| 文件页数： | 7/28页 |
| 文件大小： | 810K |
| 代理商： | TPS5431DDA |
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10-35V
VIN
C1
4.7 F
m
C4
4.7 F
m
ENA
VIN
ENA
NC
GND
PwPd
BOOT
PH
VSNS
U1
TPS5430DDA
C2
0.01 F
m
L1
22 H
m
D1
B340A
C3
220 F
m
R2
3.24kW
5V
VOUT
R1
10kW
C3=SanyoPOSCAP 10TP220M
+
9-21V
VIN
C1
ENA
VIN
ENA
NC
GND
PwPd
BOOT
PH
VSNS
U1
TPS5431DDA
C2
0.01 F
m
L1
18 H
m
D1
B340A
C3
220 F
m
R2
3.24kW
5V
VOUT
R1
10kW
C3=SanyoPOSCAP 10TP220M
SLVS632C – JANUARY 2006 – REVISED NOVEMBER 2006
Catch Diode
The TPS5430 is designed to operate using an external catch diode between PH and GND. The selected diode
must meet the absolute maximum ratings for the application: Reverse voltage must be higher than the maximum
voltage at the PH pin, which is VINMAX + 0.5 V. Peak current must be greater than IOUTMAX plus on half the
peak to peak inductor current. Forward voltage drop should be small for higher efficiencies. It is important to
note that the catch diode conduction time is typically longer than the high-side FET on time, so attention paid to
diode parameters can make a marked improvement in overall efficiency. Additionally, check that the device
chosen is capable of dissipating the power losses. For this design, a Diodes, Inc. B340A is chosen, with a
reverse voltage of 40 V, forward current of 3 A, and a forward voltage drop of 0.5 V.
Additional Circuits
Figure 12 and Figure 13 show application circuits using wide input voltage ranges. The design parameters are
similar to those given for the design example, with a larger value output inductor and a lower closed loop
crossover frequency.
Figure 12. 10–35 V Input to 5 V Output Application Circuit
Figure 13. 9–21 V Input to 5 V Output Application Circuit
Circuit Using Ceramic Output Filter Capacitors
Figure 14 shows an application circuit using all ceramic capacitors for the input and output filters which
generates a 3.3-V output from a 10-V to 24-V input. The design procedure is similar to those given for the
design example, except for the selection of the output filter capacitor values and the design of the additional
compensation components required to stabilize the circuit.
15
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