LM5115A Secondary Side Post Regulator/DC-DC Converter with Power-up/Power-down
Tracking
January 2007
LM5115A
Secondary Side Post Regulator/DC-DC Converter with
Power-up/Power-down Tracking
General Description
The LM5115A controller contains all of the features neces-
sary to produce multiple tracking outputs using the Secondary
Side Post Regulation (SSPR) technique. The SSPR tech-
nique develops a highly efficient and well regulated auxiliary
output from the secondary side switching waveform of an iso-
lated power converter. LM5115A can be also used as a
standalone DC/DC synchronous buck controller (Refer
to
Synchronous Buck section).
Regulation of the auxiliary
output voltage is achieved by leading edge pulse width mod-
ulation (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 LM5115A drives exter-
nal 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 com-
mon mode input range. Additional features include a low
dropout (LDO) bias regulator, error amplifier, precision refer-
ence, adaptive dead time control of the gate signals and
thermal shutdown.
Features
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Power-up/Power-down Tracking
Self-synchronization to main channel output
Leading edge pulse width modulation
Valley current Mode control
Standalone DC/DC synchronous buck mode
Operates from AC or DC input up to 75V
Wide 4.5V to 30V bias supply range
Wide 0.75V to 13.5V 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 package
Typical Application Circuit
20207101
FIGURE 1. Simplified Multiple Output Power Converter Utilizing SSPR Technique
漏 2007 National Semiconductor Corporation
202071
www.national.com
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