NCL30185 Datasheet, PDF (1/28 Pages) ON Semiconductor – Power Factor Corrected Quasi-Resonant Primary Side Current-Mode Controller

NCL30185
Power Factor Corrected
Quasi-Resonant Primary
Side Current-Mode
Controller for LED Lighting
with Line Step Dimming and
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Thermal Foldback
The NCL30185 is a controller targeting isolated and non−isolated
“smart−dimmable” constant−current LED drivers. Designed to
support flyback, buck−boost, and SEPIC topologies, its proprietary
current−control algorithm provides near−unity power factor and
8
1
SOIC−8 NB
CASE 751
tightly regulates a constant LED current from the primary side, thus
eliminating the need for a secondary−side feedback circuitry or an
optocoupler.
Housed in the SOIC8, the NCL30185 is specifically intended for
very compact space−efficient designs. The device is highly integrated
MARKING DIAGRAM
8
L30185x
ALYW
G
with a minimum number of external components. A robust suite of
safety protections is built in to simplify the design. To ensure reliable
operation at elevated temperatures, a user configurable current
foldback circuit is also provided. In addition, it supports step dimming
which allows light output reduction by toggling the main AC switch
on and off.
1
L30185x = Specific Device Code
x = A, B
A
= Assembly Location
L
= Wafer Lot
Y
= Year
Pin−to−pin compatible to the NCL30085, the NCL30185 provides
the same benefits with in addition, an increased resolution of the
W
= Work Week
G
= Pb-Free Package
digital current−control algorithm for a 75% reduction in the LED
current quantization ripple.
Features
PIN CONNECTIONS
1
ZCD
V_CC
• Quasi−resonant Peak Current−mode Control Operation
VS
DRV
• Valley Lockout Optimizes Efficiency over the Line/Load Range
• Constant Current Control with Primary Side Feedback
• Tight LED Constant Current Regulation of ±2% Typical
• Power Factor Correction
COMP
SD
(Top View)
GND
CS
• 3 Step Dimming (70/25/5%)
• Line Feedforward for Enhanced Regulation Accuracy
• Low Start−up Current (10 mA typ.)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 27 of this data sheet.
• Wide V_cc Range
• 300 mA / 500 mA Totem Pole Driver with 12 V Gate Clamp
• Robust Protection Features
♦ OVP on V_CC
♦ Programmable Over Voltage / LED Open Circuit
Protection
♦ Thermal Shutdown
♦ V_cc Undervoltage Lockout
♦ Brown−out Protection
♦ Cycle−by−cycle Peak Current Limit
♦ Winding Short Circuit Protection
♦ Secondary Diode Short Protection
♦ Output Short Circuit Protection
• Pb−Free, Halide−Free MSL1 Product
Typical Applications
• Integral LED Bulbs and Tubes
♦ Current Sense Short Protection
♦ User Programmable NTC Based Thermal Foldback
• LED Light Engines
• LED Drivers/Power Supplies
© Semiconductor Components Industries, LLC, 2016
1
February, 2016 − Rev. 0
Publication Order Number:
NCL30185/D