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| 型号： | TPS54550PWP |
| 厂商： | Texas Instruments |
| 文件页数： | 20/31页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 16HTSSOP |
| 产品培训模块： | Understanding SWIFT Step Down Dc/Dc Converters |
| 标准包装： | 90 |
| 系列： | SWIFT™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.9 V ~ 12 V |
| 输入电压： | 4.5 V ~ 20 V |
| 频率 - 开关： | 250kHz，500kHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-HTSSOP |
| 产品目录页面： | 1029 (CN2011-ZH PDF) |
| 配用： | 296-19743-ND - EVALUATION MODULE FOR TPS54550 |
| 其它名称： | 296-19672-5 |
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SLVS623A – MARCH 2006 – REVISED APRIL 2006
For the output filter inductor, it is important that the
RMS current and saturation current ratings not be
exceeded. The RMS inductor current can be found
2
www.ti.com
39 μ F. In this design a more consevative frequency
multiplier of 3 is used, resulting in a desired output
capacitance of 200 μ F. The selected output capacitor
must be rated for a voltage greater than the desired
output voltage plus 1/2 the ripple voltage. Any
OUT
IN(MAX)
I
L(RMS)
+
I 2
OUT(MAX)
)
1
12
V
V
V IN(MAX) * V OUT
L F 0.8
OUT SW
(12)
derating amount must also be included. The
maximum RMS ripple current in the output capacitor
ICOUT(RMS) + 1
IN(MAX)
OUT
SW
and the peak inductor current can be determined
12
VOUT
V
VIN(MAX) * V OUT
L F N
C
V IN(MAX) * V
OUT
V IN(MAX)
OUT
SW
IL(PK) + I
OUT(MAX)
)
V
1.6 L
OUT
F
(13)
(15)
Where N C is the number of output capacitors in
For this design, the RMS inductor current is 5.04 A
and the peak inductor current is 5.35 A. The chosen
inductor is a Sumida CDRH105-6R8 6.8 μ H. It has a
saturation current rating of 5.4 A and an RMS current
rating of 5.4 A, meeting these requirements. A
smaller value inductor could be used; however, this
value was chosen because it has the largest value in
this style that met the current rating requirements.
Larger value inductors will have lower ac current and
parallel.
The maximum ESR of the output capacitor is
determined by the amount of allowable output ripple
as specified in the initial design parameters. The
output ripple voltage is the inductor ripple current
times the ESR of the output filter, so the maximum
specified ESR as listed in the capacitor data sheet is
OUT
OUT
SW
result in lower output voltage ripple. In general,
inductor values for use with the TPS54550 are in the
range of 6.8 μ H to 47 μ H.
ESR MAX + N
C
V IN(MAX)
V
L F 0.8
V IN(MAX) * V OUT
D V p * p(MAX)
(16)
Capacitor Selection
The important design factors for the output capacitor
are dc voltage rating, ripple current rating, and
equivalent series resistance (ESR). The dc voltage
and ripple current ratings cannot be exceeded. The
ESR is important because along with the inductor
current it determines the amount of output ripple
voltage. The actual value of the output capacitor is
not critical, but some practical limits do exist.
Consider the relationship between the desired closed
loop crossover frequency of the design and LC
corner frequency of the output filter. In general, it is
desirable to keep the closed loop crossover
frequency at less than 1/5 of the switching
frequency. With high switching frequencies such as
the 700-kHz frequency of this design, internal circuit
limitations of the TPS54550 limit the practical
maximum crossover frequency to about 50 kHz.
Additionally, to allow for adequate phase gain in the
compensation network, the the closed loop crossover
frequency should be at least 30% higher than the LC
corner frequency. This limits the minimum capacitor
value for the output filter to:
Where Δ V p-p is the desired peak-to-peak output
ripple. For this design example, two 100- μ F ceramic
output capacitors are chosen for C2 and C10. These
are TDK C3225X5R0J107M, rated at 6.3 V with a
maximum ESR of 2 m ? and a ripple current rating in
excess of 3 A. The calculated total RMS ripple
current is 161 mA ( 80.6 mA each) and the maximum
total ESR required is 43 m ? . These output
capacitors exceed the requirements by a wide
margin and will result in a reliable, high-performance
design. it is important to note that the actual
capacitance in circuit may be less than the catalog
value when the output is operating at the desired
output of 3.3 V.
Other capacitor types work well with the TPS54550,
depending on the needs of the application.
COMPENSATION COMPONENTS
The external compensation used with the TPS54550
allows for a wide range of output filter configurations.
A large range of capacitor values and types of
dielectric are supported. The design example uses
Type 3 compensation consisting of R1, R3, R5, C6,
C
OUT
+
1
L OUT
(
K
2 p ? CO
)
2
(14)
C7, and C8. Additionally, R2 along with R1 forms a
voltage divider network that sets the output voltage.
These component reference designators are the
Where K is the frequency multiplier for the spread
between f LC and f CO . K should be between 1.3 and
15, typically 10 for one decade difference. For a
desired crossover of 13 kHz and a 6.8- μ H inductor,
the minimum value for the output capacitor is around
same as those used in the SWIFT Designer
Software. There are a number of different ways to
design a compensation network. This procedure
outlines a relatively simple procedure that produces
good results with most output filter combinations.
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS54550PWP | 制造商:Texas Instruments 功能描述:PWM SWITCHER FET 6A O/P HTSSOP16 制造商:Texas Instruments 功能描述:PWM SWITCHER, FET 6A O/P, HTSSOP16 制造商:Texas Instruments 功能描述:PWM SWITCHER, FET 6A O/P, HTSSOP16; Primary Input Voltage:20V; No. of Outputs:1; Output Voltage:12V; Output Current:6A; Voltage Regulator Case Style:HTSSOP; No. of Pins:16; Operating Temperature Min:-40C; Operating Temperature ;RoHS Compliant: Yes |
| TPS54550PWPG4 | 功能描述:直流/直流开关调节器 4.5 to 20V Input 6A Step Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54550PWPR | 功能描述:开关变换器、稳压器与控制器 4.5 to 20V Input 6A Step Down RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TPS54550PWPR/2801 | 功能描述:直流/直流开关调节器 4.5-20Vin,5A Sync SD Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54550PWPRG4 | 功能描述:开关变换器、稳压器与控制器 4.5 to 20V Input 6A Step Down RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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