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Rapidly switching currents associated with wiring inductance can generate voltage transients which can cause problems. FB Senses the regulated output voltage to complete the feedback loop. The device includes a voltage reference, oscillation circuit, error amplifier, internal PMOS and etc.
Bypass Vin to GND with a suitably large capacitorto eliminate noise on the input. If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor. Higher ambient temperatures require more heat sinking.
The size of the heat sink depends on the input td1140, the output voltage, the load current and the ambient temperature. Wiring inductance, stray capacitance, as well as the scope probe used to evaluate these transients, all contribute to the amplitude of these spikes.
Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. When using the adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring.
The TD junction temperature rises above ambient temperature for a 2A load and different input and output voltages.
Vendor Web Site 1 Diodes,Inc. Supply Voltage Input Pin. Exposure to absolute maximum rating conditions for extended periods may affect reliability. This is the positive input supply for the IC switching regulator. Typical Application Circuit 3. The SOP8 package needs a heat sink under most conditions. Switching Frequency vs Temperature Figure 6.
Power Switch Output Pin.
The output ripple voltage is due mainly to the inductor sawtooth ripple current multiplied by the ESR of the output capacitor. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes.
As in any switching regulator, layout td410 very important. Once exception to tr1410 is the output switch pin, which should not have large areas of copper. Large areas of copper provide the best transfer of heat lower thermal resistance to the surrounding air, and moving air lowers the thermal resistance even further.
For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. Parameters Symbol Test Condition Min.
TDA KHZ 20V PWM Buck DC/DC Converter
Physically locate both resistors near the IC, and route the wiring away form the inductor especially an open core type of inductor. Care must be taken in layout. An internal compensation block is built in to minimize external component count. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator.
Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. Icc vs Temperature Figure 8.
Datasheet 2A KHZ 20V PWM Buck DC/DC
Ttd1410 EN pin high to turn on the regulator, drive it low to turn it off. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator GND Circuit ground. The voltage spikes are present because of the fast switching action of the output switch, and the parasitic inductance of the output filter capacitor, To minimize these voltage spikes, special low inductance capacitors can be used, and their lead lengths must be kept short.
SW is the switch node that supplies power to the output. An additional small LC filter can be added to the td14100 as shown in Figure 14 td4110 further reduce the amount of output ripple and transients.