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LM5115SDX Datasheet

  • LM5115SDX

  • Secondary Side Post Regulator Controller

  • 17頁(yè)

  • NSC

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LM5115 Secondary Side Post Regulator Controller
PRELIMINARY
March 2005
LM5115
Secondary Side Post Regulator Controller
General Description
The LM5115 controller contains all of the features necessary
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
LM5115 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
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Self-synchronization to main channel output
Free-run mode for buck regulation of DC input
Leading edge pulse width modulation
Voltage-mode control with current injection and input line
feed-forward
Operates from AC or DC input up to 75V
Wide 4.5V to 30V bias supply range
Wide 0.75V to 12V output range.
Top and bottom gate drivers sink 2.5A peak
Adaptive gate driver dead-time control
Wide bandwidth error amplifier (4MHz)
Programmable soft-start
Thermal shutdown protection
TSSOP-16 or thermally enhanced LLP-16 packages
Typical Application Circuit
20134901
FIGURE 1. Simplified Multiple Output Power Converter Utilizing SSPR Technique
漏 2005 National Semiconductor Corporation
DS201349
www.national.com

LM5115SDX 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Reel

  • 4500

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