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| 型号： | TPS54550PWP |
| 厂商： | Texas Instruments |
| 文件页数： | 19/31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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www.ti.com
SLVS623A – MARCH 2006 – REVISED APRIL 2006
?
?
Input voltage range
Output voltage
D VIN +
I OUT(MAX)
C BULK
0.25
? sw
) I OUT(MAX)
ESR MAX
(9)
?
?
?
?
Input ripple voltage
Output ripple voltage
Output current rating
Operating frequency
Where I OUT(MAX) is the maximum load current, f SW is
the switching frequency, C BULK is the bulk capacitor
value and ESR MAX is the maximum series resistance
of the bulk capacitor.
OUT(MAX)
CIN
For this design example, use the following as the
input parameters:
DESIGN PARAMETER EXAMPLE VALUE
Input voltage range 6 V to 17 V
Output voltage 3.3 V
The maximum RMS ripple current also needs to be
checked. For worst case conditions, this can be
I
I +
2 (10)
Input ripple voltage
Output ripple voltage
300 mV
30 mV
In this case, the input ripple voltage would be 140
mV and the RMS ripple current would be 2.5 A. It is
RT(k W ) +
Output current rating 5A
Operating frequency 700 kHz
NOTE: As an additional constraint, the design is set up to be
small size and low component height.
SWITCHING FREQUENCY
The switching frequency is set using the RT pin.
Grounding the RT pin sets the PWM switching
frequency to a default frequency of 250 kHz. Floating
the RT pin sets the PWM switching frequency to 500
kHz. By connecting a resistor from RT to AGND, any
frequency in the range of 250 to 700 kHz can be set.
Use Equation 8 to determine the proper value of RT.
46000
? s(kHz) * 35.9 (8)
In this example circuit, the desired switching
frequency is 700 kHz and RT is 69.8 k ? .
INPUT CAPACITORS
The TPS54550 requires an input decoupling
capacitor and, depending on the application, a bulk
input capacitor. The minimum recommended value
for the decoupling capacitor, C9, is 10 μ F. A
also important to note that the actual input voltage
ripple will be greatly affected by parasitics associated
with the layout and the output impedance of the
voltage source. The actual input voltage ripple for
this circuit is shown in Figure 34 and is larger than
the calculated value. This measured value is still
below the specified input limit of 300 mV. The
maximum voltage across the input capacitors would
be VIN max plus Δ VIN/2. The chosen bulk and
bypass capacitors are each rated for 25 V and the
combined ripple current capacity is greater than 3 A,
both providing ample margin. It is very important that
the maximum ratings for voltage and current are not
exceeded under any circumstance.
OUTPUT FILTER COMPONENTS
Two components need to be selected for the output
filter, L1 and C2. Since the TPS54550 is an
externally compensated device, a wide range of filter
component types and values can be supported.
Inductor Selection
To calculate the minimum value of the output
IN(max)
IN(MAX)
OUT
IND
OUT
SW
high-quality ceramic type X5R or X7R is
recommended. The voltage rating should be greater
than the maximum input voltage. A smaller value
may be used as long as all other requirements are
L
MIN
+
V
OUT(MAX)
V
K
V * V
I F
(11)
met; however 10 μ F has been shown to work well in
a wide variety of circuits. Additionally, some bulk
capacitance may be needed, especially if the
TPS54550 circuit is not located within about 2 inches
from the input voltage source. The value for this
capacitor is not critical but should be rated to handle
the maximum input voltage including ripple voltage,
and should filter the output so that input ripple
voltage is acceptable.
This input ripple voltage can be approximated by
K IND is a coefficient that represents the amount of
inductor ripple current relative to the maximum
output current. In general, this value is at the
discretion of the designer; however, the following
guidelines may be used. For designs using low ESR
output capacitors such as ceramics, a value as high
as K IND = 0.3 may be used. When using higher ESR
output capacitors, K IND = 0.2 yields better results.
For this design example, use K IND = 0.3 and the
minimum inductor value is calculated to be 3 μ H. For
this design, a large value was chosen: 6.8 μ H.
19
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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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