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TS30111-M015 bảng dữ liệu(PDF) 7 Page - Semtech Corporation |
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TS30111-M015 bảng dữ liệu(HTML) 7 Page - Semtech Corporation |
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7 / 21 page  TS30111 Final Datasheet Rev 1.0 June 2, 2015 www.semtech.com 7 of 21 Semtech Functional Description The TS30111 current-mode synchronous step-down power supply product is ideal for use in the commercial, industrial, and automotive market segments. It includes flexibility to be used for a wide range of output voltages and is optimized for high efficiency power conversion with low RDSON integrated synchronous switches. A 1MHz internal switching frequency facilitates low cost LC filter combinations. Additionally, the fixed output versions enable a minimum external component count to provide a complete regulation solution with only 4 external components: an input bypass capacitor, an inductor, an output capacitor, and the bootstrap capacitor. The regulator automatically transitions between PFM and PWM mode to maximize efficiency for the load demand. The TS30111 was designed to provide these system benefits: • Reduced board real estate • Lower system cost Lower cost inductor Low external parts count • Ease of design Bill of Materials and suggested board layout provided Power Good output Integrated compensation network Wide input voltage range • Robust solution Over current, over voltage and over temperature pro- tection Detailed Pin Description Unregulated input, VCC This terminal is the unregulated input voltage source for the IC. It is recommended that a 10uF bypass capacitor be placed close to the device for best performance. Since this is the main supply for the IC, good layout practices need to be followed for this connection. Bootstrap control, BST This terminal will provide the bootstrap voltage required for the upper internal NMOS switch of the buck regulator. An external ceramic capacitor placed between the BST input terminal and the VSW pin will provide the necessary voltage for the upper switch. In normal operation the capacitor is re-charged on every low side synchronous switching action. In the case of where the switch mode approaches 100% duty cycle for the high side FET, the device will automatically reduce the duty cycle switch to a minimum off time on every 8th cycle to allow this capacitor to re-charge. Sense feedback, FB This is the input terminal for the output voltage feedback. For the fixed mode versions, this should be hooked directly to V OUT. The connection on the PCB should be kept as short as possible, and should be made as close as possible to the capacitor. The trace should not be shared with any other connection. (Figure 23) For adjustable mode versions, this should be connected to the external resistor divider. To choose the resistors, use the following equation: V OUT = 0.8 (1 + RTOP/RBOT) The input to the FB pin is high impedance, and input current should be less than 100nA. As a result, good layout practices are required for the feedback resistors and feedback traces. When using the adjustable version, the feedback trace should be kept as short as possible and minimum width to reduce stray capacitance and to reduce the injection of noise. For the adjustable version, the ratio of VCC/V OUT cannot exceed 16. Switching output, VSW This is the switching node of the regulator. It should be connected directly to the 3.3uH inductor with a wide, short trace and to one end of the Bootstrap capacitor. It is switching between VCC and PGND at the switching frequency. Ground, GND This ground is used for the majority of the device including the analog reference, control loop, and other circuits. Power Ground, PGND This is a separate ground connection used for the low side synchronous switch to isolate switching noise from the rest of the device. (Figure 23) Enable, EN This is the input terminal to activate the regulator. The input threshold is TTL/CMOS compatible. It also has an internal pull- up to ensure a stable state if the pin is disconnected. |
Số phần tương tự - TS30111-M015 |
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Mô tả tương tự - TS30111-M015 |
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