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WD1030DA-7/TR Datasheet(PDF) 6 Page - Will Semiconductor Ltd. |
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WD1030DA-7/TR Datasheet(HTML) 6 Page - Will Semiconductor Ltd. |
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6 / 9 page  WD1030 Will Semiconductor Ltd. 6 Dec,2017- Rev. 1.0 Operation Information The WD1030DA is a high efficiency 1.3MHz synchronous Step-Down DC/DC regulator capable of delivering up to 1.5A output current. It can operate over a wide input voltage range from 2.7V to 5.5V and integrate main switch and synchronous switch with very low RDSON to minimize the conduction loss. Application Information Because of the high intergration in the WD1030DA IC, the application circuit based on this regulator IC is rather simple.only input capacitor Cin, output capacitor Cout, output inductor L and feedback resistors (RH and RL) need to be selected for the targeted applications specifications. Feedback resistor dividers RH and RL : Choose RH and RL to program the proper output voltage. To minimize the power consumption under light loads, it is desirable to choose larger resistance values for both RH and RL. A value of between 100k Ω and 1MΩ is highly recommended for both resistors. If RL =120kΩ is chosen, then RH can be calculated to be: ( ) Input Capacitor CIN : A Typical X7R or better grade ceramic capacitor with 10V rating and greater than 10uF capacitor is recommended. To minimize the potential noise problem, place this ceramic capacitor really close to the IN and GND pins. Care should be taken to minimize the loop area formed by CIN, and IN/GND pins. Output inductor L : There are several considerations in choosing this inductor. 1) Choose the inductance to provide the desired ripple current. It is suggested to choose the ripple current to be about 40% of the maximum output current. The inductance is calculated as: ( ) × × Where Fsw is the switching frequency and Iout,max is the maximum load current. 2) The saturation current rating of the inductor must be selected to be greater than the peak inductor current under full load conditions. ( ) 3) The DCR of the inductor and the core loss at the switching frequency must be low enough to achieve the desired efficiency requirement. It is desirable to choose an inductor with DCR<25mΩ to achieve a good overall efficiency. Inductor vs. Output Capacitor: The ripple base control strategy need very little COUT to confirm stability. Too large inductor and COUT will lead to unstability. OCP and SCP Protection Method: With load current increasing, the NFET current will get higher than valley current limit threshold. The NFET will keep turning on until NFET current decrease to the valley current limit threshold, so that valley current is limited. If the load current continues to increase, the output voltage will drop. When the output voltage falls below 40% of the regulation level, output short is detected and the IC will work in hiccup mode. The hiccup frequency is about 1kHz, the hiccup duty is 50%. If the hard short is removed, IC will go back to normal operation. Layout Consideration The layout design of WD1030DA regulator is |
Similar Part No. - WD1030DA-7/TR |
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Similar Description - WD1030DA-7/TR |
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