欧美激情国产免费,尹人香蕉久久99天天拍久女久 ,欧美日韩一二级黄片

ZHCSLA4E May 2020 – October 2024 TPS61378-Q1

PRODUCTION DATA

封裝選項

機械數據 (封裝 | 引腳)

RTE|16
- MPQF149D

散熱焊盤機械數據 (封裝 | 引腳)

RTE|16
- QFND630A

訂購信息

8.2.2.1 Programming the Output Voltage

The output voltage is determined by the resistor sensed from FB pin before device is enabled.

There are two ways to set the output voltage of the TPS61378-Q1, adjustable output voltage(for TPS61378-Q1 and TPS613783-Q1 only) and fixed output voltage.

TPS61378-Q1 Typical Connection of FB Pin For
Adjustable Output Voltage

Figure 8-2 Typical Connection of FB Pin For Adjustable Output Voltage

Figure 8-2 shows the typical circuit of the FB pin conncetion for adjustable output voltage. The FB resistor R_FB is defined as Equation 3:

Equation 3.

R_{F B} = R_{I N S E R T} + \frac{R_{U P} \times R_{D O W N}}{R_{U P} + R_{D O W N}}

When selected for adjustable output voltage, R_FB must be above 14.4kΩ. The FB pin is connected to the negative input of the internal error amplifier directly. The output voltage can be programmed by adjusting the external resistor divider R_UP and R_DOWN according to Equation 4.

Equation 4.

V_{O U T} = V_{R E F} \times \frac{(R_{U P} + R_{D O W N})}{R_{D O W N}}

Equation 4 shows that the output voltage setting is only influenced by R_UP and R_DOWN. In normal application, R_INSERT can be 0Ω, that is, directly connect FB pin to middle point of feedback voltage divider.

For automotive application that do not prefer to use resistors more than 100 kΩ, R_INSERT (>15kΩ) can be used so that calculated R_UP and R_DOWN feedback resistor value could be less than 100kΩ.

When working with adjustable voltage, for the best accuracy, R_DOWN is recommended to be smaller than 160 kΩ to ensure that the current flowing through R_DOWN is at least 100 times larger than FB pin leakage current. Changing R_DOWN towards the lower value increases the robustness against noise injection. Changing R_DOWN to higher values reduces the quiescent current to achieve higher efficiency at light load.

TPS61378-Q1 Typical Connection of FB Pin For Fixed
Output Voltage

Figure 8-3 Typical Connection of FB Pin For Fixed Output Voltage

Figure 8-3 shows the typical circuit of the FB pin conncetion for fixed output voltage.The FB resistor R_FB is defined as Equation 5:

Equation 5.

R_{F B} = R_{D O W N}

When designed for fixed output voltage, the TPS61378-Q1 uses the internal resistor divider and works with fixed output voltage. The TPS61378-Q1 subdivides the voltage due to R_FB and device part number. See Device Comparison Table for detailed information.