TPS92315 Datasheet, PDF (1/27 Pages) Texas Instruments – Off-Line Primary-Side Sensing Controller

TPS92315
www.ti.com
SNVS904A – NOVEMBER 2012 – REVISED FEBRUARY 2013
Off-Line Primary-Side Sensing Controller
Check for Samples: TPS92315
FEATURES
1
• Primary-Side Regulation (PSR) eliminates
opto-coupler
• ±5% LED current regulation
• 130 kHz maximum switching frequency
enables high power density SSL drivers
designs
• Quasi-resonant valley switching operation for
highest overall efficiency
• Patent-pending frequency jitter scheme to
ease EMI compliance
• Wide VCC range (35V) allows small bias
capacitor
• Drive output for MOSFET
• Protection functions: over-voltage, low-line,
and over-current
• SOT23-6 package
APPLICATIONS
• LED lighting driver applications
• Small form factor LED light bulbs (E14, GU-10)
DESCRIPTION
The TPS92315 flyback power supply controller
provides isolated output current regulation without the
use of an optical coupler. The devices process
operating information from the primary power switch
and an auxiliary flyback winding to provide precise
output current control. Low start-up current,
dynamically controlled operating states and a tailored
modulation profile support very low stand-by power
without sacrificing start-up time or output transient
response.
Control algorithms in the TPS92315 allow operating
efficiencies to meet or exceed applicable standards.
The drive output interfaces to a FET power switch.
Discontinuous Conduction Mode (DCM) with valley
switching is used to reduce switching losses. A
combination of switching frequency and peak primary
current amplitude modulation is used to keep
conversion efficiency high across the full load and
input voltage range.
The controller has a maximum switching frequency of
130 kHz and always maintains control of the peak
primary current in the transformer. Protection features
help keep secondary and primary component stress
levels in check across the operation range.
SIMPLIFIED APPLICATION DIAGRAM
85-264VAC
TPS92315
VCC GATE
ISNS
VSNS GND
1
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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