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LM25115 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM25115 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
1 / 17 page LM25115 Secondary Side Post Regulator Controller General Description The LM25115 controller contains all of the features neces- sary to implement multiple output power converters utilizing the Secondary Side Post Regulation (SSPR) technique. The SSPR technique develops a highly efficient and well regu- lated auxiliary output from the secondary side switching waveform of an isolated power converter. Regulation of the auxiliary output voltage is achieved by leading edge pulse width modulation (PWM) of the main channel duty cycle. Leading edge modulation is compatible with either current mode or voltage mode control of the main output. The LM25115 drives external high side and low side NMOS power switches configured as a synchronous buck regulator. A current sense amplifier provides overload protection and operates over a wide common mode input range. Additional features include a low dropout (LDO) bias regulator, error amplifier, precision reference, adaptive dead time control of the gate signals and thermal shutdown. Features n Self-synchronization to main channel output n Free-run mode for buck regulation of DC input n Leading edge pulse width modulation n Voltage-mode control with current injection and input line feed-forward n Operates from AC or DC input up to 42V n Wide 4.5V to 30V bias supply range n Wide 0.75V to 13.5V output range. n Top and bottom gate drivers sink 2.5A peak n Adaptive gate driver dead-time control n Wide bandwidth error amplifier (4MHz) n Programmable soft-start n Thermal shutdown protection n TSSOP-16 or thermally enhanced LLP-16 packages Typical Application Circuit 20172601 FIGURE 1. Simplified Multiple Output Power Converter Utilizing SSPR Technique November 2005 © 2005 National Semiconductor Corporation DS201726 www.national.com |
Số phần tương tự - LM25115 |
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Mô tả tương tự - LM25115 |
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