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| 型号： | TPS54550PWP |
| 厂商： | Texas Instruments |
| 文件页数： | 21/31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
Use of the SWIFT Designer Software is
recommended for designs with unusually high closed
loop crossover frequencies, low value, low ESR
output capacitors such as ceramics, or if the
designer is unsure about the design procedure.
When designing compensation networks for the
TPS54550, a number of factors need to be
considered. The gain of the compensated error
?
?
?
?
Z1
Z2
P1
P2
+
+
+
+
1
2 p R3C6
1
2 p R1C8
1
2 p R5C8
1
2 p R3C7
(19)
(20)
(21)
(22)
?
INT
2 p R1C6
amplifier should not be limited by the open-loop
amplifier gain characteristics and should not produce
excessive gain at the switching frequency. Also, the
closed loop crossover frequency should be set less
than 1/5 of the switching frequency, and the phase
margin at crossover must be greater than 45
degrees. The general procedure outlined here
produces results consistent with these requirements
without going into great detail about the theory of
loop compensation.
First, calculate the output filter LC corner frequency
Additionally, there is a pole at the origin, which has
unity gain with the following frequency:
1
+
(23)
This pole is used to set the overall gain of the
compensated error amplifier and determines the
closed loop crossover frequency.
There are a number of popular ways to design Type
3 compensation networks. The theory behind these
calculations is beyond the scope of this document. It
is always best to to use any calculated compensation
OUT OUT
?
LC
+
2 p L
1
C
(17)
values as the basis for an initial design, and then
verify the actual closed loop response. The initial
values may then be adjusted to suit the individual
R2 +
OUT
For the design example, f LC = 4315 Hz.
The closed loop crossover frequency should be
greater than f LC and less than 1/5 of the switching
frequency. Also, the crossover frequency should not
exceed 50 kHz, as the error amplifier may not
provide the desired gain. For this design, a crossover
frequency of 13 kHz was chosen. This value is
chosen for comparatively wide loop bandwidth while
still allowing for adequate phase boost to insure
stability.
Next, calculate the R2 resistor value for the output
R1 0.891
V * 0.891
(18)
For any TPS54550 design, start with an R1 value of
1.0 k ? . R2 is then 374 ? .
design requirements. The SWIFT software design
tool can also be used to provide an intial circuit
design.
In this circuit, the first compensation zero was set at
approximately 1/2 the LC corner frequency, with the
second zero slightly below that to increase the phase
gain prior to the double pole of the LC output filter. At
the LC corner frequency, the overall phase response
rapidly drops by 180 degrees, so it is imprtant to
increase the initial phase of 90 degrees prior to the
LC corner.
The two compensation poles are set high enough to
to not cause loss of phase margin at the closed loop
cross over and low enough to not cause the error
amplifier gain to exceed the unity gain bandwidth
limit of the internal operational amplifier. The
integrator frequency is then chosen to set the overall
gain and crossover frequency.
Now the values for the compensation components
that set the poles and zeroes of the compensation
network can be calculated. Assuming that R1 > R5
and C6 > C7, the pole and zero locations are given
This results
frequencies:
f Z1 = 2340 Hz
in
the
following
pole
and
zero
blank
blank
blank
blank
f Z2 = 1591 Hz
f P1 = 120 kHz
f P2 = 159 kHz
f INT = 234 Hz
21
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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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