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| 型号： | TPS54550PWPRG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 12/31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： | 2,000 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 16-HTSSOP |
| 配用： | 296-19743-ND - EVALUATION MODULE FOR TPS54550 |
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SLVS623A – MARCH 2006 – REVISED APRIL 2006
www.ti.com
Overcurrent Protection
Overcurrent protection is implemented by sensing
the drain-to-source voltage across the high-side
MOSFET and compared to a voltage level which
represents the overcurrent threshold limit. If the
drain-to-source voltage exceeds the overcurrent
threshold limit for more than 100 ns, the high-side
OUTPUT VOLTAGE (V)
1.2
1.5
1.8
2.5
3.3
R2 VALUE (k ? )
28.7
14.7
9.76
5.49
3.74
MOSFET is disable, the SSENA pin is pulled low,
and the internal digital slow-start is reset to 0 V.
SSENA is held low for approximately the time that is
Output Voltage Limitations
Due to the internal design of the TPS54550 there are
both upper and lower output voltage limits for any
+ 2250
?
T
HICCUP(ms)
s(kHz)
(6)
given input voltage. Additionally, the lower boundary
of the output voltage set point range also depends
on operating frequency. The upper limit of the output
R2 + R1
Once the hiccup time is complete, the SSENA pin is
released and the converter initiates the internal
slow-start.
Setting the Output Voltage
The output voltage of the TPS54550 can be set by
feeding back a portion of the output to the VSENSE
pin using a resistor divider network. In the application
circuit of Figure 29 , this divider network is comprised
of resistors R1 and R2. To calculate the resistor
values to generate the required output voltage use
the following equation:
0.891
V O * 0.891 (7)
Start with a fixed value of R1 and calculate the
required R2 value. Assuming a fixed value of 10 k ?
for R1, the following table gives the appropriate R2
value for several common output voltages:
voltage set point is constrained by the maximum duty
cycle of the device and is shown in Figure 12 . The
lower limit is constrained by the minimum
controllable on time, which may be as high as 220
ns. The approximate minimum output voltage for a
given input voltage and range of operating
frequencies is shown in Figure 8 , while the maximum
operating frequency versus input voltage for some
The curves shown in these two figures are valid for
output currents greater than 0.5 A. As output
currents decrease towards no load (0 A), the
minimum output voltage decreases. For applications
where the load current is less than 100 mA, the
curves shown in Figure 9 and Figure 11 are
applicable. All of the data plotted in these curves are
approximate and take into account a possible 20%
deviation in actual operating frequency relative to the
intended set point.
12
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| TPS54560BQDDARQ1 | 功能描述:IC REG BUCK SPLT ADJ 5A 8PWRSOIC 制造商:texas instruments 系列:汽车级，AEC-Q100，Eco-Mode? 包装:剪切带（CT） 零件状态:在售 功能:降压 输出配置:正 拓扑:降压，分压轨 输出类型:可调式 输出数:1 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:60V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:58.8V 电流 - 输出:5A 频率 - 开关:100kHz ~ 2.5MHz 同步整流器:无 工作温度:-40°C ~ 150°C（TJ） 安装类型:表面贴装 封装/外壳:8-PowerSOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SO PowerPad 标准包装:1 |
| TPS54560DDA | 功能描述:直流/直流开关转换器 60V Input 5 A SD DC-DC Cnvtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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