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LM2825N-12 데이터시트(PDF) 7 Page - National Semiconductor (TI) |
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LM2825N-12 데이터시트(HTML) 7 Page - National Semiconductor (TI) |
7 / 12 page Test Circuit Application Information PROGRAMMING OUTPUT VOLTAGE (Selecting R1 and R2 as shown in Figure 3) The LM2825 is available in two adjustable output versions. The LM2825-ADJ has been optimized for output voltages between 1.23V and 8V, while the LM2825H-ADJ covers the output voltage range of 7V to 15V. Both adjustable versions are set in the following way. Select a value for R1 between 240 Ω and 1.5 kΩ. The lower resistor values minimize noise pickup at the sensitive adjust pin. (For lowest temperature coefficient and the best stability with time, use 1% metal film resistors.) Select R2 with the following equation. When programming V OUT, keep in mind that VIN must be greater than V OUT + 2V for proper operation. OPTIONAL EXTERNAL COMPONENTS SOFT-START CAPACITOR C SS: A capacitor on this pin provides the regulator with a Soft-start feature (slow start-up). The current drawn from the source starts out at a low average level with narrow pulses, and ramps up in a controlled manner as the pulses expand to their steady-state width. This reduces the startup current considerably, and delays and slows down the output voltage rise time. DS012661-19 *Optional—Required if package is more than 6" away from main filter or bypass capacitor. **Optional Soft-start Capacitor VIN = 40V (max) VOUT = 3.3V or 5V @ 1A or 12V @ 0.75A FIGURE 2. Standard Test Circuit (Fixed Output Voltage Versions) DS012661-30 *Optional—Required if package is more than 6" away from main filter or bypass capacitor. **Optional Soft-start Capacitor ***Optional—See Application Information. VIN = 40V (max) VOUT = 1.23V to 8V (LM2825-ADJ) 7V to 15V (LM2825H-ADJ) ILOAD = IMAX (See derating curves) FIGURE 3. Standard Test Circuit (Adjustable Output Voltage Versions) 7 www.national.com |
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