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參數(shù)資料
| 型號： | TPS54062DGKR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 6/30頁 |
| 文件大?。?/td> | 745K |
| 代理商： | TPS54062DGKR |
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SLVSAV1
– MAY 2011
Overvoltage Transient Protection
The TPS54062 incorporates an overvoltage transient protection (OVTP) circuit to minimize voltage overshoot
when recovering from output fault conditions or strong unload transients on power supply designs with low value
output capacitance. For example, when the power supply output is overloaded the error amplifier compares the
actual output voltage to the internal reference voltage. If the VSENSE pin voltage is lower than the internal
reference voltage for a considerable time, the output of the error amplifier will respond by clamping the error
amplifier output to a high voltage. Thus, requesting the maximum output current. Once the condition is removed,
the regulator output rises and the error amplifier output transitions to the steady state duty cycle. In some
applications, the power supply output voltage can respond faster than the error amplifier output can respond, this
actuality leads to the possibility of an output overshoot.
The OVTP feature minimizes the output overshoot, when using a low value output capacitor, by implementing a
circuit to compare the VSENSE pin voltage to OVTP threshold which is 109% of the internal voltage reference. If
the VSENSE pin voltage is greater than the OVTP threshold, the high side MOSFET is disabled preventing
current from flowing to the output and minimizing output overshoot. When the VSENSE voltage drops lower than
the OVTP threshold, the high side MOSFET is allowed to turn on at the next clock cycle.
Thermal Shutdown
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 146
°C.
The thermal shutdown forces the device to stop switching when the junction temperature exceeds the thermal
trip threshold. Once the die temperature decreases below 146
°C, the device reinitiates the power up sequence
by restarting the internal slow start.
DESIGN GUIDE
– STEP-BY-STEP DESIGN PROCEDURE No.1
Figure 21. Application Schematic
This example details the design of a continuous conduction mode (CCM) switching regulator design using
ceramic output capacitors. If a low output current design is needed go to the design procedure Number 2. A few
parameters must be known in order to start the design process. These parameters are typically determined at the
system level. For this example, we will start with the following known parameters:
Output Voltage
3.3V
Transient Response 0 to 50mA load step
ΔVOUT = 4%
Maximum Output Current
50mA
Input Voltage
24 V nom. 8V to 60V
Output Voltage Ripple
0.5% of VOUT
Start Input Voltage (rising VIN)
7.88V
Stop Input Voltage (falling VIN)
6.66V
14
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54062
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| TPS54062DRBR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4.7-60Vin,50mA Sync Step-Down Cnvrtr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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| TPS54073 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.2 ?4 -V, 14-A SYNCHRONOUS BUCK CONVERTER WITH DISABLED SINKING DURING START-UP |
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