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? Semiconductor Components Industries, LLC, 2009

December, 2009 - Rev. 0

1 Publication Order Number:

NCL30000/D

NCL30000

Power Factor Corrected

Dimmable LED Driver

The NCL30000 is a switch mode power supply controller intended

for low to medium power single stage power factor (PF) corrected

LED Drivers. The device is designed to operate in critical conduction

mode (CrM) and is suitable for flyback as well as buck topologies.

Constant on time CrM operation is particularly suited for isolated

flyback LED applications as the control scheme is straightforward and

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 and 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

capacitor. The current sense protection

threshold has been set at 500 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

Constant On Time PWM Control

Cycle- by- Cycle Current Protection

Low Current Sense Threshold of 500 mV

Low 2 mA Typical Operating Current

? Source 500 mA / Sink 800 mA Totem Pole Gate Driver

Reference Design for TRIAC and Trailing Edge Line Dimmers

? Wide Operating Temperature Range

No Input Voltage Sensing Requirement

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 Down Lights

Commercial and Residential LED Fixtures

TRIAC Dimmable LED Based PAR Lamps

Power Factor Corrected Constant Voltage Supplies

http://onsemi.com

SOIC - 8

D SUFFIX

CASE 751

MARKING

DIAGRAM

PIN CONNECTION

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

G = Pb- Free Package

L0000

ALYW

MFP

Comp

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.

NCL30000DR2G SOIC - 8

(Pb- Free)

2500 / Tape & Reel

NCL30000

http://onsemi.com

Table 1. PIN FUNCTION DESCRIPTION

Pin Name Function

1 MFP The multi - function 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 is connected between this pin

and ground to set the loop bandwidth. Normally this bandwidth is set at a low frequency (typically 10 Hz - 20 Hz) to

achieve high power factor and low total harmonic distortion (THD).

3 C

The C

pin sources a regulated current to charge an external timing capacitor. The PWM circuit controls the power

switch on time by comparing the C

voltage to an internal voltage derived from V

Control

. The C

pin discharges the

external timing capacitor at the end of the on time cycle.

4 CS The CS input is used to sense the instantaneous switch current in the external MOSFET. This signal is filtered by an

internal leading edge blanking circuit.

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 has been demagnetized, 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 turn - on threshold voltage of the power MOSFET when V

CC(on)

is not reached.

8 V

This pin is the positive supply of the controller. The circuit starts to operate when V

exceeds V

CC(on)

, nominally

12 V and turns off when V

goes below V

CC(off)

, typically 9.5 V. After startup, the operating range is 10.2 V up to

20 V.

NCL30000

http://onsemi.com

Table 2. MAXIMUM RATINGS

Rating Symbol Value Unit

MFP Voltage VMFP - 0.3 to 10 V

MFP Current I

MFP

±10 mA

COMP Voltage V

Control

- 0.3 to 6.5 V

COMP Current I

Control

- 2 to 10 mA

Ct Voltage V

- 0.3 to 6 V

Ct Current I

Ct ±10 mA

CS Voltage V

- 0.3 to 6 V

CS Current I

±10 mA

ZCD Voltage V

ZCD

- 0.3 to 10 V

ZCD Current I

ZCD ±10 mA

DRV Voltage V

DRV

- 0.3 to V

DRV Sink Current I

DRV(sink)

800 mA

DRV Source Current I

DRV(source)

500 mA

Supply Voltage V

- 0.3 to 20 V

Supply Current I

CC ±20 mA

Power Dissipation (T

= 70°C, 2.0 Oz Cu, 55 mm

Printed Circuit Copper Clad) P

450 mW

Thermal Resistance Junction - to- Ambient

(2.0 Oz Cu, 55 mm

Printed Circuit Copper Clad)

Junction - to- Air, Low conductivity PCB (Note 3)

Junction - to- Air, High conductivity PCB (Note 4)

qJA

178

168

127

°C/W

Operating Junction Temperature Range TJ - 40 to 125 °C

Maximum Junction Temperature TJ(MAX) 150 °C

Storage Temperature Range T

STG

- 65 to 150 °C

Lead Temperature (Soldering, 10 s) TL 300 °C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

1. This device series contains ESD protection and exceeds the following tests:

Pins 1 – 8: Human Body Model 2000 V per JEDEC Standard JESD22 - A114E.

Pins 1 – 8: Machine Model Method 200 V per JEDEC Standard JESD22 - A115- A.

2. This device contains Latch - Up protection and exceeds ±　100 mA per JEDEC Standard JESD78.

3. As mounted on a 40x40x1.5 mm FR4 substrate with a single layer of 80 mm

of 2 oz copper traces and heat spreading area. As specified

for a JEDEC 51 low conductivity test PCB. Test conditions were under natural convection or zero air flow.

4. As mounted on a 40 x 40 x 1.5 mm FR4 substrate with a single layer of 650 mm

of 2 oz copper traces and heat spreading area. As specified

for a JEDEC 51 high conductivity test PCB. Test conditions were under natural convection or zero air flow.

Table 3. ELECTRICAL CHARACTERISTICS

MFP

= 2.4 V, V

Control

= 4 V, Ct = 1 nF, V

= 0 V, V

ZCD

= 0 V, C

DRV

= 1 nF, V

= 12 V, unless otherwise specified

(For typical values, T

= 25 °C. For min/max values, T

= - 40°C to 125 °C, unless otherwise specified)

Characteristic Test Conditions Symbol Min Typ Max Unit

STARTUP AND SUPPLY CIRCUITS

Startup Voltage Threshold V

Increasing V

CC(on)

11 12 12.5 V

Minimum Operating Voltage V

Decreasing V

CC(off)

8.8 9.5 10.2 V

Supply Voltage Hysteresis HUVLO 2.2 2.5 2.8 V

Startup Current Consumption 0 V < V

< V

CC(on)

- 200 mV I

cc(startup)

- 24 35

No Load Switching

Current Consumption

DRV

= open, 70 kHz Switching,

= 2 V

cc1

- 1.4 1.7 mA

Switching Current Consumption 70 kHz Switching, V

= 2 V I

cc2

- 2.1 2.6 mA

Fault Condition Current Consumption No Switching, V

MFP

= 0 V I

cc(fault)

- 0.75 0.95 mA

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