NCL30085 Datasheet, PDF (1/27 Pages) ON Semiconductor – Quasi-Resonant Primary Side Current-Mode Controller

NCL30085
Power Factor Corrected
Quasi-Resonant Primary
Side Current-Mode
Controller for LED Lighting
with Line Step Dimming and
www.onsemi.com
Thermal Foldback
8
The NCL30085 is a power factor corrected flyback controller
1
targeting isolated and non−isolated constant current LED drivers. The
controller operates in a quasi−resonant mode to provide optimal
SOIC−8 NB
CASE 751
efficiency. Thanks to a novel control method, the device is able to
tightly regulate a constant LED current from the primary side. This
MARKING DIAGRAM
removes the need for secondary side feedback circuitry, biasing and an
8
optocoupler.
The device is highly integrated with a minimum number of external
components. A robust suite of safety protection is built in to simplify
L30085x
ALYW
G
the design. This device is specifically intended for very compact,
1
space efficient designs and supports 3 levels of log step dimming
L30085x = Specific Device Code
which allows light output reduction by toggling the main AC switch
on and off to signal the controller to reduce the LED current point
down to 5% of full load.
x = A, B
A
= Assembly Location
L
= Wafer Lot
Y
= Year
Features
• Quasi−resonant Peak Current−mode Control Operation
W
= Work Week
G
= Pb-Free Package
• Constant Current Control with Primary Side Feedback
• Tight LED Constant Current Regulation of ±2% Typical
• Power Factor Correction
PIN CONNECTIONS
1
ZCD
V_CC
• 3 Step Dimming (70/25/5%)
VS
DRV
• Line Feedforward for Enhanced Regulation Accuracy
COMP
GND
• Low Start−up Current (10 mA typ.)
• Wide V_cc Range
• 300 mA / 500 mA Totem Pole Driver with 12 V Gate Clamp
SD
CS
(Top View)
• Robust Protection Features
♦ OVP on V_CC
♦ Programmable Over Voltage / LED Open Circuit Protection
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 26 of this data sheet.
♦ Cycle−by−cycle Peak Current Limit
♦ Winding Short Circuit Protection
♦ Secondary Diode Short Protection
• Pb−Free, Halide−Free MSL1 Product
♦ Output Short Circuit Protection
♦ Current Sense Short Protection
♦ User Programmable NTC Based Thermal Foldback
Typical Applications
• Integral LED Bulbs and Tubes
♦ Thermal Shutdown
• LED Light Engines
♦ V_cc Undervoltage Lockout
♦ Brown−out Protection
• LED Drivers/Power Supplies
© Semiconductor Components Industries, LLC, 2015
1
April, 2015 − Rev. 3
Publication Order Number:
NCL30085/D