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MAX1836-MAX1837 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1836-MAX1837 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 13 page MAX1836/MAX1837 Stability Commonly, instability is caused by excessive noise on the feedback signal or ground due to poor layout or improper component selection. When seen, instability typically manifests itself as “motorboating,” which is characterized by grouped switching pulses with large gaps and excessive low-frequency output ripple during no-load or light-load conditions. PC Board Layout and Grounding High switching frequencies and large peak currents make PC board layout an important part of the design. Poor layout may introduce switching noise into the feedback path, resulting in jitter, instability, or degrad- ed performance. High-power traces, bolded in the typi- cal application circuits (Figures 1 and 2), should be as short and wide as possible. Additionally, the current loops formed by the power components (CIN, COUT, L1, and D1) should be as tight as possible to avoid radiated noise. Connect the ground pins of these power components at a common node in a star-ground configuration. Separate the noisy traces, such as the LX node, from the feedback network with grounded copper. Furthermore, keep the extra copper on the board, and integrate it into a pseudoground plane. When using external feedback, place the resistors as close to the feedback pin as possible to minimize noise coupling. The MAX1837 evaluation kit shows the rec- ommended layout. Applications Information High-Voltage Step-Down Converter The typical application circuits’ (Figures 1 and 2) com- ponents were selected for 9V battery applications. However, the MAX1836/MAX1837 input voltage range allows supply voltages up to 24V. Figure 6 shows a modified application circuit for high-voltage applica- tions. When using higher input voltages, verify that the input capacitor’s voltage rating exceeds VIN(MAX) and that the inductor value exceeds the minimum induc- tance recommended in the Inductor Selection section. Inverter Configuration Figure 7 shows the MAX1836/MAX1837 in a floating ground configuration. By connecting what would nor- mally be the output to the supply-voltage ground, the IC’s ground pin is forced to regulate to -5V (MAX183_EUT50) or -3.3V (MAX183_EUT33). Avoid exceeding the maximum ratings of 24V between IN and GND, and 5.5V between OUT and GND. Other negative voltages may be generated by placing a resistive divider across the output capacitor and connecting the tap to FB in the same manner as the normal step-down configuration. 24V Internal Switch, 100% Duty Cycle, Step-Down Converters ______________________________________________________________________________________ 11 SUPPLIER PHONE FAX WEBSITE INDUCTORS Coilcraft 847-639-6400 847-639-1469 www.coilcraft.com Coiltronics 561-241-7876 561-241-9339 www.coiltronics.com Sumida USA 847-956-0666 847-956-0702 www.sumida.com Toko 847-297-0070 847-699-1194 www.tokoam.com CAPACITORS AVX 803-946-0690 803-626-3123 www.avxcorp.com Kemet 408-986-0424 408-986-1442 www.kemet.com Panasonic 847-468-5624 847-468-5815 www.panasonic.com Sanyo 619-661-6835 619-661-1055 www.secc.co.jp Taiyo Yuden 408-573-4150 408-573-4159 www.t-yuden.com DIODES Central Semiconductor 516-435-1110 516-435-1824 www.centralsemi.com International 310-322-3331 310-322-3332 www.irf.com Nihon 847-843-7500 847-843-2798 www.niec.co.jp On Semiconductor 602-303-5454 602-994-6430 www.onsemi.com Zetex 516-543-7100 516-864-7630 www.zetex.com Table 1. Component Suppliers |
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