TPS5430DDAR,TI switching regulator step-down conversion DC-DC power supply chip
TPS5430DDAR,TI switching regulator step-down conversion DC-DC power supply chip
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Features of TPS5430DDAR
1. Wide input voltage range:5.5V----36V (wide voltage means high adaptability of the circuit to voltage). Adjustable to 1.22V,1.5% initial accuracy
2.3A continuous (4A peak) output current.
3. Efficiency up to 95%,provided by 110mΩintegrated MOSFET switch
4. Internal compensation minimizes the number of external components. (The purpose of compensation is generally because the device changes with the temperature environment,the operating point,and the performance will drift. In this case,it is often necessary to use capacitors and resistors with opposite temperature characteristics to compensate in order to offset the drift. The internal compensation of the chip integrates compensation devices,which is more convenient to use and does not require adding circuits by yourself)
5. Fixed 500khz switching frequency for small filter size (500kHz switching frequency allows less output inductance,and the same output ripple requirement leads to smaller output inductance)
6. System protection overcurrent limit,overvoltage protection and thermal shutdown mechanism
II. Performance and parameters of TPS5430DDAR
1. Package:HSOP (small size package with heat sink,this package has a mechanically attached thick copper thermal segment to improve thermal performance. The exposed thermal segment provides a direct path for heat conduction).
2. Pin configuration and function:
BOOT:Boost capacitor for the gate driver of the high-side field effect transistor. Connect a 0.01uf low ESR capacitor from the BOOT pin to the PH pin. (ESR:In theory,a perfect capacitor will not produce any energy loss itself,but in reality,the capacitor becomes imperfect due to various reasons such as resistance of the material used to make the capacitor and loss of the insulating medium of the capacitor. This loss is externally manifested as a resistor connected in series with the capacitor,so it is called "equivalent series resistance". In most cases,low ESR capacitors often perform better than high ESR ones) (Capacitors are recommended to use X7R or X5R grade dielectrics because they are temperature stable)
NC:No pin.
VSENSE:Feedback voltage of the regulator. Connected to the output voltage divider.
ENA:On/off control. Below 0.5V,the device stops switching and the pin floats to enable the chip.
GND:Ground.
VIN:Input power supply voltage. From the VIN pin to the GND pin,go to a high-quality,low-ESR ceramic capacitor close to the device package.
PH:The source of the high-side power MOSFET,connected to an external inductor and diode.
3. Absolute Maximum Ratings
(1) VIN range:-0.3V-----40V (approaching the absolute maximum rating of the VIN pin may cause the voltage on the PH pin to exceed the absolute maximum rating).
(2) PH (unchanged):-0.6V-------40V. PH (transient <10ns):-4V
(3) ENA:-0.3V----7V
(4) BOOT--PH:-0.3V------10V
(5) VSENSE:-0.3V-----3V (In steady-state operation,the VSENSE pin voltage should be equal to the reference voltage 1.221V)
(6) PH (leakage current):10uA
(7) Operating virtual interface temperature range:-40℃-----150℃
(8) Storage temperature range:-65℃-----150℃
(9) Operating junction temperature:-40℃-----125℃
(10) This design uses a 15uH inductor,which is limited by the minimum output capacitor
The calculated minimum capacitance value is 34 μF. For this circuit,the larger the capacitance value,the better the transient response. C3 uses a single 100 μF output capacitor. It should be noted that the actual capacitance of a ceramic capacitor decreases with the applied voltage.
(11) External compensation network:When using ceramic output capacitors,additional circuitry is required to stabilize the closed-loop system. The external components of this circuit are R3,C4,C6,and C7. To determine the values of these components,first calculate the LC resonant frequency of the output filter
For input ripple voltage and maximum ripple current,it can be approximated by
(12) Minimum value of inductance
(13) The effective value of the inductor current can be given by
(14) Peak current of the inductor
(15) There is a certain correlation between the closed-loop crossover frequency and the LC corner frequency:
(16) Output capacitor value required for the output filter:
(17) Maximum ESR:
(18) The rated voltage of the selected output capacitor must be greater than the desired output voltage plus half the ripple voltage. Any derating amount must also be included. The maximum effective ripple current of the output capacitor is:
(19) The output voltage of the TPS5430 is set by a resistor divider (R1 and R2) from the output to the VSENSE pin. Calculate the R2 resistor value for an output voltage of 5V:For any TPS5430 design,start with an R1 value of 10 kΩ. R2 is 3.24 kΩ.
(20) For any given input voltage there are upper and lower output voltage limits. The upper limit of the output voltage setting value is constrained by the maximum duty cycle of 87%,which is
IV. Application circuit of TPS54300DDAR
Simple application template:
Typical application circuit:12V input voltage 5V output voltage
This circuit:Input voltage range:10.8V-----19.8V output voltage:5V
Input ripple voltage:300mV Output ripple voltage:30mV
Output current rating:3A
V. Precautions for use of TPS54300DDAR
1. The ground pin must be connected to the exposed pad for normal operation.
2. Exceeding the absolute maximum rating may cause permanent damage to the device.
3. All voltage values are related to the network ground terminal.
Manufacturer introduction:Texas Instruments
Texas Instruments Incorporated designs and manufactures analog technologies,digital signal processing (DSP) and microcontroller (MCU) semiconductors. TI is a leader in semiconductor solutions for analog and digital embedded and applications processing. A global semiconductor company,TI innovates through design,sales and manufacturing operations in more than 30 countries.
Why Choose TPS54300DDAR ？
The TPS5430DDAR is a DC-DC converter produced by Texas Instruments,which belongs to its high-efficiency buck regulator series. The package of this model is SOT-6 package,specifically SOT-23-6 package. The operating voltage range,output current capability and other electrical characteristics of this device make it very useful in many power management applications.
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