參數(shù)資料
型號(hào)： TPS5420D
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8
封裝： PLASTIC, MS-012AA, SOIC-8
文件頁(yè)數(shù)： 6/24頁(yè)
文件大?。?/td> 738K
代理商： TPS5420D
www.ti.com
R2 +
R1
1.221
V
OUT *
1.221
(12)
+
10V-21V
L1
27 H
m
GND
VSNS
NC
ENA
BOOT
PH
D1
B340A
C2
0.01 F
m
R2
3.24kW
R1
10kW
VIN
C1
10 F
m
U1
TPS5420D
TP5
5V
7
1
5
8
2
4
3
6
VOUT
VIN
ENA
C3
100 F
m
(SeeNote A)
SLVS642C – APRIL 2006 – REVISED OCTOBER 2007
Output Voltage Setpoint
The output voltage of the TPS5420 is set by a resistor divider (R1 and R2) from the output to the VSENSE pin.
Calculate the R2 resistor value for the output voltage of 5 V using Equation 12:
For any TPS5420 design, start with an R1 value of 10 k
. R2 is then 3.24 k.
Boot Capacitor
The boot capacitor should be 0.01
μF.
Catch Diode
The TPS5420 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; therefore, the diode
parameters improve the 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 shows an application circuit using a wide input voltage range. 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.
A.
C3 = Tantalum AVX TPSD107M010R0080
Figure 12. 10-V — 21-V Input to 5-V Output Application Circuit
Circuit Using Ceramic Output Filter Capacitors
Figure 13 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.
14
Copyright 2006–2007, Texas Instruments Incorporated
Product Folder Link(s): TPS5420
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS5420D 制造商:Texas Instruments 功能描述:Linear Voltage Regulator IC
TPS5420DG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS5420D-P 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
TPS5420DR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS5420DRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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