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LMZ10504EXTTZE bảng dữ liệu(PDF) 8 Page - National Semiconductor (TI) |
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LMZ10504EXTTZE bảng dữ liệu(HTML) 8 Page - National Semiconductor (TI) |
8 / 22 page Block Diagram 30118436 General Description The LMZ10504EXT SIMPLE SWITCHER® power module is a complete, easy-to-use DC-DC solution capable of driving up to a 4A load with exceptional power conversion efficiency, output voltage accuracy, line and load regulation. The LMZ10504EXT is available in an innovative package that en- hances thermal performance and allows for hand or machine soldering. The LMZ10504EXT can accept an input voltage rail between 2.95V and 5.5V and deliver an adjustable and highly accurate output voltage as low as 0.8V. One megahertz fixed frequen- cy PWM switching provides a predictable EMI characteristic. Two external compensation components can be adjusted to set the fastest response time, while allowing the option to use ceramic and/or electrolytic output capacitors. Externally pro- grammable soft-start capacitor facilitates controlled startup. The LMZ10504EXT is a reliable and robust solution with the following features: lossless cycle-by-cycle peak current limit to protect for over current or short-circuit fault, thermal shut- down, input under-voltage lock-out, and pre-biased startup. Design Guideline And Operating Description Design Steps LMZ10504EXT is fully supported by Webench® and offers the following: component selection, performance, electrical, and thermal simulations as well as the Build-It board, for a reduced design time. On the other hand, all external compo- nents can be calculated by following the design procedure below. 1. Determine the input voltage and output voltage. Also, make note of the ripple voltage and voltage transient requirements. 2. Determine the necessary input and output capacitance. 3. Calculate the feedback resistor divider. 4. Select the optimized compensation component values. 5. Estimate the power dissipation and board thermal require- ments. 6. Follow the PCB design guideline. 7. Learn about the LMZ10504EXT features such as enable, input UVLO, soft-start, tracking, pre-biased startup, current limit, and thermal shutdown. Design Example For this example the following application parameters exist. • V IN = 5V • V OUT = 2.5V • I OUT = 4A • ΔV OUT = 20 mVpk-pk • ΔV o_tran = ±20 mVpk-pk Input Capacitor Selection A 22 µF or 47 µF high quality dielectric (X5R, X7R) ceramic capacitor rated at twice the maximum input voltage is typically sufficient. The input capacitor must be placed as close as possible to the VIN pin and GND exposed pad to substantially eliminate the parasitic effects of any stray inductance or re- sistance on the PC board and supply lines. Neglecting capacitor equivalent series resistance (ESR), the resultant input capacitor AC ripple voltage is a triangular waveform. The minimum input capacitance for a given peak- to-peak value ( ΔV IN) of VIN is specified as follows: where the PWM duty cycle, D, is given by: If ΔV IN is 1% of VIN, this equals to 50 mV and fSW = 1 MHz www.national.com 8 |
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