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
CC
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
−40C
to 125C.
Features
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SOIC−8
CASE 751
PIN CONNECTION
MFP
Comp
Ct
CS
(Top View)
V
CC
DRV
GND
ZCD
MARKING DIAGRAM
8
L0000
ALYW
G
1
A
L
Y
W
G
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
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
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb-Free Package
ORDERING INFORMATION
Device
NCL30000DR2G
Package
SOIC−8
(Pb−Free)
Shipping
†
2,500/Tape & Reel
†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.
Typical Applications
Semiconductor Components Industries, LLC, 2012
September, 2012
−
Rev. 1
1
Publication Order Number:
NCL30000/D
NCL30000
+
+
−
V
OVP
−
+
+
V
UVP
E/A
−
+
g
m
R
MFP
+
V
REF
V
CC
Management
V
CC
(Enable EA)
UVP
OVP
MFP
Fault
COMP
V
Control
V
EAH
Clamp
V
DD
275
mA*
C
t
Power Good
PWM
Add Ct
Offset
−
+
mV
DD
V
DD
DRV
CS
LEB
195 ns*
+
+
−
V
ILIM
+
ZCD
+
−
V
ZCD(ARM)
+
+
−
V
ZCD(TRIG)
Reset
180
ms*
Off Timer
ZCD
Clamp
* Typical Values Shown
S Q
R Q
Demag
OCP
S Q
R Q
V
CC
S Q
R Q
DRV
mV
DD
S Q
R Q
GND
All SR Latches are Reset Dominant
Figure 1. Block Diagram
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2
NCL30000
Table 1. PIN FUNCTION DESCRIPTION
Pin
1
Name
MFP
Function
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.
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).
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.
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.
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.
This is the analog ground for the device. All bypassing components should be connected to the GND pin with a short
trace length.
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.
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.
2
COMP
3
C
t
4
5
CS
ZCD
6
7
GND
DRV
8
V
CC
C in
R SU
R1
R ZCD
NCL30000
1
MFP
VCC
8
C1
2
R2
Ccomp
3
CT
CS
GND
6
COMP
DRV
7
Q1
4
C tim
ZCD
5
R CS
Figure 2. Simplified Flyback Application with Secondary side Constant Current Control
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3
ÏÏ
ÏÏ
Ï
Ï
Ï
D1
Ï
Cv
8
VCC
RL
OUT2
7
+
−
IN2+ 5
IN2− 6
NCS1002
OUT1
1
2
−
IN1−
IN1+ 3
+
GND
Cc
4
C OUT
AC
Line
Input
EMI
FILTER
D out
Ra
Rb
Rx
Rt
Ry
Rc
RLED
NCL30000
Overview
Figure 2 illustrates how the NCL30000 is configured to
implement an isolated power factor corrected flyback
switch mode power supply. On the secondary side is the
NCS1002, a constant voltage, constant current controller
which senses the average LED current and the output
voltage and provides a feedback control signal to the
primary side through an opto-coupler interface. One of the
key benefits of active power factor correction is that it makes
the load appear like a linear resistance similar to an
incandescent bulb. High power factor requires generally
sinusoidal line current and minimal phase displacement
between the line current and voltage. The NCL30000
operates in a fixed on-time variable frequency mode where
Table 2. MAXIMUM RATINGS
Rating
MFP Voltage
MFP Current
COMP Voltage
COMP Current
Ct Voltage
Ct Current
CS Voltage
CS Current
ZCD Voltage
ZCD Current
DRV Voltage
DRV Sink Current
DRV Source Current
Supply Voltage
Supply Current
the power switch is on for the same length of time over a half
cycle of input power. The current in the primary of the
transformer starts at zero each switching cycle and is directly
proportional to the applied voltage times the on-time.
Therefore with a fixed on-time, the current will follow the
applied voltage generating a current of the same shape. Just
as in a traditional boost PFC circuit, the control bandwidth
is low so that the on-time is constant throughout a single line
cycle. The feedback signal from the secondary side is used
to modify the average on-time so the current through the
LEDs is properly regulated regardless of forward voltage
variation of the LED string.
Symbol
V
MFP
I
MFP
V
Control
I
Control
V
Ct
I
Ct
V
CS
I
CS
V
ZCD
I
ZCD
V
DRV
I
DRV(sink)
I
DRV(source)
V
CC
I
CC
P
D
R
qJA
R
qJA
R
qJA
T
J
T
J(MAX)
T
STG
T
L
Value
−0.3
to 10
10
−0.3
to 6.5
−2
to 10
−0.3
to 6
10
−0.3
to 6
10
−0.3
to 10
10
−0.3
to V
CC
800
500
−0.3
to 20
20
450
178
168
127
−40
to 125
150
−65
to 150
300
Unit
V
mA
V
mA
V
mA
V
mA
V
mA
V
mA
mA
V
mA
mW
C/W
Power Dissipation (T
A
= 70C, 2.0 Oz Cu, 55 mm
2
Printed Circuit Copper Clad)
Thermal Resistance Junction-to-Ambient
(2.0 Oz Cu, 55 mm
2
Printed Circuit Copper Clad)
Junction-to-Air, Low conductivity PCB (Note 3)
Junction-to-Air, High conductivity PCB (Note 4)
Operating Junction Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 s)
C
C
C
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 40
40
1.5 mm FR4 substrate with a single layer of 80 mm
2
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
40
1.5 mm FR4 substrate with a single layer of 650 mm
2
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.
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4
NCL30000
V
MFP
= 2.4 V, V
Control
= 4 V, Ct = 1 nF, V
CS
= 0 V, V
ZCD
= 0 V, C
DRV
= 1 nF, V
CC
= 12 V, unless otherwise specified
(For typical values, T
J
= 25C. For min/max values, T
J
=
−40C
to 125C, unless otherwise specified)
Characteristic
STARTUP AND SUPPLY CIRCUITS
Startup Voltage Threshold
Minimum Operating Voltage
Supply Voltage Hysteresis
Startup Current Consumption
No Load Switching
Current Consumption
Switching Current Consumption
Fault Condition Current Consumption
0 V < V
CC
< V
CC(on)
−
200 mV
C
DRV
= Open, 70 kHz Switching,
V
CS
= 2 V
70 kHz Switching, V
CS
= 2 V
No Switching, V
MFP
= 0 V
V
MFP
= Increasing
V
MFP
= 2 V to 3 V ramp,
dV/dt = 1 V/ms
V
MFP
= V
OVP
to V
DRV
= 10%
V
MFP
= Decreasing
V
MFP
= 1 V to 0 V ramp,
dV/dt = 10 V/ms
V
MFP
= V
UVP
to V
DRV
= 10%
V
CC
Increasing
V
CC
Decreasing
V
CC(on)
V
CC(off)
H
UVLO
I
cc(startup)
I
cc1
I
cc2
I
cc(fault)
V
OVP
/V
REF
V
OVP(HYS)
t
OVP
11
8.8
2.2
−
−
−
−
12
9.5
2.5
24
1.4
2.1
0.75
12.5
10.2
2.8
35
1.7
2.6
0.95
V
V
V
mA
mA
mA
mA
Test Conditions
Symbol
Min
Typ
Max
Unit
Table 3. ELECTRICAL CHARACTERISTICS
OVERVOLTAGE AND UNDERVOLTAGE PROTECTION
Overvoltage Detect Threshold
Overvoltage Hysteresis
Overvoltage Detect Threshold
Propagation Delay
Undervoltage Detect Threshold
Undervoltage Detect Threshold
Propagation Delay
ERROR AMPLIFIER
Voltage Reference
Voltage Reference Line Regulation
Error Amplifier Current Capability
T
J
= 25C
T
J
=
−40C
to 125C
V
CC(on)
+ 200 mV < V
CC
< 20 V
V
MFP
= 2.6 V
V
MFP
= 1.08*V
REF
V
MFP
= 0.5 V
V
MFP
= 2.4 V to 2.6 V
T
J
= 25C
T
J
=
−40C
to 125C
V
MFP
= V
UVP
to V
REF
V
MFP
= 2.5 V
V
MFP
= 0 V
I
Control(pullup)
= 10
mA,
V
MFP
= V
REF
V
Control
= Decreasing until
V
DRV
is low, V
Ct
= 0 V
V
EAH
– Ct
(offset)
V
REF
V
REF(line)
I
EA(sink)
I
EA(sink)OVP
I
EA(source)
gm
90
70
R
MFP
I
MFP
I
Control
V
EAH
Ct
(offset)
V
EA(DIFF)
2
0.25
−1
5
0.37
4.5
110
110
4.6
0.54
−
5.5
0.65
4.9
120
135
10
1.25
1
6
0.88
5.3
MW
mA
mA
V
V
V
2.475
2.460
−10
6
10
−110
2.500
2.500
−
10
20
−210
2.525
2.540
10
20
30
−250
V
mV
mA
105
20
−
106
60
500
108
100
800
%
mV
ns
V
UVP
t
UVP
0.25
100
0.31
200
0.4
300
V
ns
Transconductance
mS
Feedback Pin Internal Pull−Down
Resistor
Feedback Bias Current
Control Bias Current
Maximum Control Voltage
Minimum Control Voltage to Generate
Drive Pulses
Control Voltage Range
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