Power Factor Corrected
Quasi-Resonant Primary
Side Current-Mode
Controller for LED Lighting
Below 25 W
www.onsemi.com
NCL37733
The NCL37733 is a compact driver for power−factor corrected
flyback and non−isolated buck−boost and SEPIC converters. The
controller operates in a quasi−resonant mode to provide optimal
efficiency, and embeds a proprietary control method which allows the
LED current to be tightly regulated from the primary side, thus
eliminating the need for a secondary−side feedback circuitry and for
an optocoupler.
1
TSOP−6
CASE 318G−02
Housed in a TSOP−6 package, the device is highly integrated with a
minimum number of external components. A robust suite of safety
protection is built in to simplify the design. This device is specifically
intended for very compact space efficient designs.
MARKING DIAGRAM
2T4AYWG
G
Features
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• Quasi−resonant Peak Current−mode Control Operation
• Constant Current Control with Primary Side Feedback
• Tight LED Constant Current Regulation of 2% typical
• Near−Unity Power Factor (>0.95 typically)
• Optimized for Line Wide−range Applications
• Line Feedforward for Enhanced Regulation Accuracy
• Low Start−up Current (10 mA typ.)
2T4 = Specific Device Code
A
Y
W
G
=Assembly Location
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
• Wide V Range
CC
PIN CONNECTIONS
• 100 mA / 150 mA Totem Pole Driver with 12 V Gate Clamp
• Robust Protection Features
CS/ZCD
GND
1
2
3
6
5
4
DRV
♦ OVP on V
V
CC
CC
♦ Programmable Over Voltage / LED Open Circuit Protection
♦ Cycle by cycle peak current limit
♦ Winding Short Circuit Protection
♦ Secondary Diode Short Protection
♦ Output Short Circuit Protection
COMP
V
S
ORDERING INFORMATION
†
Device
NCL37733BSNT1G
Package
Shipping
♦ Thermal Shutdown
TSOP−6
(Pb−Free/
Halide Free)
3000 / Tape
& Reel
♦ V Undervoltage Lockout
CC
♦ Brown−Out Detection
• Pb−Free, Halide−Free MSL1 Product
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Typical Application
• Integral LED Bulbs and Tubes below 25 W
• LED Drivers / Power Supplies below 25 W
© Semiconductor Components Industries, LLC, 2020
1
Publication Order Number:
September, 2020 − Rev. 0
NCL37733/D
ONSEMI [ ONSEMI ]
