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LM2621 bảng dữ liệu(PDF) 10 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Low Input Voltage, Step-Up DC-DC Converter
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LM2621
SNVS033D – MAY 2004 – REVISED NOVEMBER 2015
www.ti.com
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LM2621 is primarily used as a Boost type step-up converter. The following section provides information
regarding connection and component choices to build a successful boost converter. Examples of typical
applications are also provided including a SEPIC step-up/step-down topology. More details on designing a
SEPIC converter can be found here: SLYT309.
8.2 Typical Applications
8.2.1 Step-Up DC-DC Converter Typical Application Using LM2621
Figure 13. Typical Circuit
8.2.1.1 Design Requirements
In order to successfully build an application, the designer should have the following parameters:
Output voltage to set the feedback voltage divider and to assess the source for biasing the VDD pin.
Input voltage range (min and max) to ensure safe operation within absolute max. rating of the IC.
Output current to ensure that the system will not hit the internal peak current limit of the IC (2.85 A typical)
during normal operation.
8.2.1.2 Detailed Design Procedure
8.2.1.2.1
Setting the Output Voltage
The output voltage of the step-up regulator can be set between 1.24 V and 14 V by connecting a feedback
resistive divider made of RF1 and RF2. The resistor values are selected as follows:
RF2 = RF1 /[(VOUT/ 1.24) −1]
(1)
A value of 150 k
Ω is suggested for RF1. Then, RF2 can be selected using the above equation. A 39-pF capacitor
(CF1) connected across RF1 helps in feeding back most of the AC ripple at VOUT to the FB pin. This helps reduce
the peak-to-peak output voltage ripple as well as improve the efficiency of the step-up regulator, because a set
hysteresis of 30 mV at the FB pin is used for the gated oscillator control scheme.
10
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