NCL30002 Datasheet, PDF (1/17 Pages) ON Semiconductor – Power Factor Corrected Buck LED Driver

NCL30002
Power Factor Corrected
Buck LED Driver
The NCL30002 is a switch mode power supply controller intended
for low to medium power single stage power factor (PF) corrected
LED Drivers. The device operates as a critical conduction mode
(CrM) buck controller to regulate LED current at a high power factor
for a specific line voltage range. The current limit threshold is tightly
trimmed allowing open loop control techniques to reduce parts count
while maintaining accurate current regulation and high power factor.
CrM operation is particularly suited for LED applications as very high
efficiency can be achieved even at low power levels. These are
important in LED lighting to comply with regulatory requirements and
meet overall system luminous efficacy requirements. In CrM, the
switching frequency will vary with line and load. Switching losses are
low as recovery losses in the output rectifier are negligible since the
current goes to zero prior to reactivating the main MOSFET switch.
The device features a programmable on time limiter, zero current
detect sense block, gate driver, trans−conductance error amplifier as
well as all PWM control circuitry and protection functions required to
implement a CrM switch mode power supply. Moreover, for high
efficiency, the device features low startup current enabling fast, low
loss charging of the V_CC capacitor. The current sense protection
threshold has been set at 485 mV to minimize power dissipation in the
external sense resistor. To support the environmental operation range
of Solid State Lighting, the device is specified across a wide junction
temperature range of −40°C to 125°C.
Features
• Very Low 24 mA Typical Startup Current
• Cycle−by−Cycle Current Protection
• Tightly Trimmed Low Current Sense Threshold of 485 mV ±2%
• Low 2 mA Typical Operating Current
• Source 500 mA / Sink 800 mA Totem Pole Gate Driver
• Wide Operating Temperature Range
• Enable Function and Overvoltage Protection
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
• LED Driver Power Supplies
• LED Based Bulbs
• Commercial and Residential LED Fixtures
http://onsemi.com
MARKING
8
DIAGRAM
1
SOIC−8
D SUFFIX
CASE 751
8
L0002
ALYW
G
1
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
PIN CONNECTION
MFP
Comp
Ct
CS
(Top View)
V_CC
DRV
GND
ZCD
ORDERING INFORMATION
Device
Package
Shipping^†
NCL30002DR2G SOIC−8 2500 / Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2012
1
March, 2012 − Rev. 0
Publication Order Number:
NCL30002/D