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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CBC2016T датащи(PDF) 11 Page - Advanced Analogic Technologies |
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CBC2016T датащи(HTML) 11 Page - Advanced Analogic Technologies |
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11 / 22 page  AAT2513 Dual 600mA Step-Down Converter with Synchronization 2513.2007.04.1.1 11 Figure 1: AAT2513 Typical Schematic. 2.2uH L1 4.7μF C1 1.8V 118k R1 2.2μH L2 2.5V R4 59.0k R2 59.0k 10μF C3 V IN 187k R3 FB1 4 EN1 10 LX1 7 PGND2 13 LX2 14 PGND1 8 AGND 2 VIN1 5 VIN2 16 PS 1 FB2 3 EN2 9 VCC 11 MODE/SYNC 12 N/C 6 N/C 15 AAT2513 U1 C2 4.7μF Low Supply UVLO Under-voltage lockout (UVLO) guarantees suffi- cient V IN bias and proper operation of all internal circuitry prior to activation. Fault Protection For overload conditions, the peak inductor current is limited. Thermal protection disables the convert- er when the internal dissipation or ambient temper- ature becomes excessive. The over-temperature threshold for the junction temperature is 140°C with 15°C of hysteresis. PWM/LL Operation For fixed frequency, with minimum ripple under light load conditions, the MODE/SYNC pin should be tied to a logic high. For more efficient operation under light load conditions the MODE/SYNC pin should be tied to a logic low level. Clock Phase and Frequency A logic high on the PS pin while in PWM mode forces both converters to operate 180° out of phase thus reducing the input ripple by roughly half. A logic low on the PS pin synchronizes both convert- ers in phase. Applications Information Inductor Selection The step down converter uses peak current mode control with slope compensation to maintain stability for duty cycles greater than 50%. The output induc- tor value must be selected so the inductor current down slope meets the internal slope compensation requirements. The internal slope compensation for the adjustable and low voltage fixed versions of the AAT2513 is 0.6A/µsec. This equates to a slope com- pensation that is 75% of the inductor current down slope for a 1.8V output and 2.2µH inductor. In this case a standard 3.3µH value is selected. 0.75 ⋅ V O L = = ≈ 1.2 ⋅ V O = 1.2 2.5V = 3.1µH m 0.75V ⋅ V O 0.6 µs A µs A µs A 0.75 ⋅ V O m = = = 0.6 L 0.75 ⋅ 1.8V 2.2µH A µsec |
Аналогичный номер детали - CBC2016T |
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Аналогичное описание - CBC2016T |
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