© Semiconductor Components Industries, LLC, 2012
March, 2012 Rev. 0
1 Publication Order Number:
NCL30002/D
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, transconductance 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
CyclebyCycle 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 PbFree, 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
SOIC8
D SUFFIX
CASE 751
MARKING
DIAGRAM
PIN CONNECTION
1
8
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
L0002
ALYW
G
1
8
MFP
Comp
Ct
CS
V
CC
DRV
GND
ZCD
(Top View)
Device Package Shipping
ORDERING INFORMATION
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.
NCL30002DR2G SOIC8
(PbFree)
2500 / Tape & Reel
NCL30002
http://onsemi.com
2
+
Figure 1. Block Diagram
E/A
Demag
UVP
Fault
LEB
195 ns*
Off Timer
Reset
PWM
R
QS
(Enable EA)
DRV
Q
All SR Latches are Reset Dominant
ZCD
Clamp
OVP
V
CC
DRV
GND
mV
DD
V
CC
MFP
ZCD
C
t
CS
COMP
+
+
V
OVP
+
V
UVP
R
MFP
V
REF
+
g
m
+
V
Control
R
QS
Q
R
QS
Q
R
QS
Q
V
ZCD(TRIG)
+
+
V
ZCD(ARM)
+
+
+
+
V
DD
Add Ct
Offset
270 mA*
V
EAH
Clamp
+
180 ms*
V
CC
Management
V
DD
Power Good
mV
DD
OCP
V
ILIM
* Typical Values Shown
NCL30002
http://onsemi.com
3
Table 1. PIN FUNCTION DESCRIPTION
Pin Name Function
1 MFP The multifunction pin is connected to the internal error amplifier. By pulling this pin below the V
uvp
threshold, the
controller is disabled. In addition, this pin also has an over voltage comparator which will disable the controller in the
event of a fault.
2 COMP The COMP pin is the output of the internal error amplifier. A compensation network connected between this pin and
ground sets the loop bandwidth.
3 C
t
The C
t
pin sources a regulated current to charge an external timing capacitor. The PWM circuit controls the power
switch on time by comparing the C
t
voltage to an internal voltage derived from V
Control
. The C
T
pin discharges the
external timing capacitor at the end of the on time cycle.
4 CS The CS input threshold is precisely trimmed to accurately sense the instantaneous switch current in the external
MOSFET. This signal is conditioned by an internal leading edge blanking circuit. The current limit threshold is tightly
trimmed for precise peak current control.
5 ZCD The voltage of an auxiliary zero current detection winding is sensed at this pin. When the ZCD control block circuit
detects that the winding current has gone to zero, a control signal is sent to the gate drive block to turn on the
external MOSFET.
6 GND This is the analog ground for the device. All bypassing components should be connected to the GND pin with a short
trace length.
7 DRV The high current capability of the totem pole gate drive (+0.5/0.8 A) makes it suitable to effectively drive high gate
charge power MOSFETs. The driver stage provides both passive and active pull down circuits that force the output to
a voltage less than the turnon threshold voltage of the power MOSFET when V
CC(on)
is not reached.
8 V
CC
This pin is the positive supply of the controller. The circuit starts to operate when V
CC
exceeds V
CC(on)
, nominally
12 V and turns off when V
CC
goes below V
CC(off)
, typically 9.5 V. After startup, the operating range is 10.2 V up to
20 V.

NCL30002DR2G

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
LED Lighting Drivers Power Factor Offline Buck LED Driver
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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