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TS30011-M000 bảng dữ liệu(PDF) 7 Page - Semtech Corporation

tên linh kiện TS30011-M000
Giải thích chi tiết về linh kiện  High Efficiency 1A/2A/3A Current-Mode Synchronous Buck DC/DC Converter, 1MHz
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nhà sản xuất  SEMTECH [Semtech Corporation]
Trang chủ  http://www.semtech.com
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TS30011-M000 bảng dữ liệu(HTML) 7 Page - Semtech Corporation

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TS30011/12/13
Final Datasheet
Rev 1.7
August 24, 2015
www.semtech.com
7 of 18
Semtech
Functional Description
The TS30011/12/13 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 TS30011/12/13 was designed to provide these system
benefits:
• Reduced board real estate
• Lower system cost
Œ
Lower cost inductor
Œ
Low external parts count
• Ease of design
Œ
Bill of Materials and suggested board layout provided
Œ
Power Good output
Œ
Integrated compensation network
Œ
Wide input voltage range
• Robust solution
Œ
Over current, over voltage and over temperature
protection
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 = 0.9 (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.


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