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LED Drivers for MR16 Lamps
NCL30160/NCL30161

1
LED Driver DC-DC Decision Tree
Wide input Voltage
LED Driver Selector
Vin < 40V

Step-down
(Buck)
Vout < Vin

Step-up
(Boost)
Vout > Vin

SEPIC/Buck-Boost
Vout < = > Vin

NCP3065/6

<350mA
Is Vout > 40V
YES

Determine
Iout?

> 1.2A

NO
< 1.2A

NCP3065/6
Boost
Controller

2 • Template • Nov-12
2

> 1.3A

NCP3065/6
Boost
Converter

What is the
Switch current

NCP3163 up to
3A Switch

CAT4201
Hysteretic Buck
Converter

NCP3065/6
Boost Controller

Confidential Proprietary

NCP3065/6
Buck
Converter

NCP3065/6
Buck
Controller

NCL30160
Buck
Converter

< 1.3A

NCL30161
Buck
Controller
NCL30100
Buck
Controller
NCL30160 – HB-LED Regulator
Value Proposition
The NCL30160 is an NFET hysteretic step-down, constant-current driver for high power LEDs. A dedicated PWM

input (DIM) enables wide range of pulsed dimming. Switching frequency up to 1.4 MHz, minimizing space and
cost. Intended for continuous conduction mode operation, thus no output capacitor is needed
Unique Features
• 50

mΩ integrated MOSFET

• Capable

of 100% max
duty cycle

Benefits

Application Data

• High efficiency solution
• Wide input voltage range

capability

• Input

voltage from 6.3 V to
40 V input

Others Features
• Up to 1.4 MHz switching frequency
• Dedicated PWM dimming pin / low power
• No control loop compensation required
• 1.5 A average current capability

shutdown

Market & Applications
•
•

Architectural: MR-16
Area Lighting: Light strips, Landscape, Under-cabinet

High Efficiency 50mΩ
MOSFET

Dedicated DIM Pin

Ordering & Package Information
•
•

3 • Template • Nov-12
3

SOIC-8
NCL30160

Confidential Proprietary
NCL30160 Key Features
Vcc operation
from 6.3-40 V

LEDs are
connected
to Vin

1 A /50 mΩ
Integrated MOSFET

Dedicated
Dimming Input

Adjustable
current sense
threshold
Adjustable
Initial off-time
control

4 • Template • Nov-12
4

Confidential Proprietary
Common Vin Multi-string Connection
D1

D4

D10

D6

D11

D13

D3

D2

D13

1u

1u

L2

NCL
30160

L1

NCL
30160

R2

R3

L3

1u
L3

NCL
30160

R3

Reduce the connection lines for the multi-string LEDs

5 • Template • Nov-12
5

Confidential Proprietary

D9

D8

D8

1u

R1

D10

D9

D15

NCL
30160

D12

D12

D7

D17

D5
Functional Description

• The NCL30160 uses a hysteretic control of the output current. It aims to
keep the peak and valley of the current ripple at a set threshold level.
• When the FET is on and the current is rising, the current is continuously
sensed through a resistor until it sees the peak current, and then turns
off.
• When the FET is off and the current is falling, a timer is used for the offtime duration. When the off-time ends, the valley current is sensed, and
adjusts the next off-time if needed.

6 • Template • Nov-12
6

Confidential Proprietary
Peak Current – Fixed Off Time
Operating Principle
D1

VIN
CIN

L1

No Output Cap

LED

LX

VIN
DIM/Enable
ROT

CS
NCL30160

RSENSE

ROT
PWM

VCC

GND

Cvcc

•Red Path show current flow when switch is ON
•Green Path shows current flow when switch is OFF
7 • Template • Nov-12
7

Confidential Proprietary
Off-Time Setting Resistor
• Since the current is not sensed while the MOSFET is off, a
timer is used to set the FET off-time duration.
• The off-time setting resistor sets the initial FET off-time only,
when the part starts up. This allows the LED current to
quickly reach its expected level.
• To pick the value of the off-time setting resistor:
– Calculate off-time:
– Calculate resistor value:

8 • Template • Nov-12
8

Confidential Proprietary
Dimming Performance
• Dimming works by pulsewidth modulation (PWM)
on the DIM/Enable pin
• The duty ratio of the PWM
is equivalent to the
amount of dimming

9 • Template • Nov-12
9

Confidential Proprietary
NCL30160 Schematic
• MR-16 12 Vac / up to 1 A application

10 • Template • Nov-12
10

Confidential Proprietary
Efficiency Performance
350 mA / 3.5 Vf

11 • Template • Nov-12
11

750 mA / 3.5 Vf

Confidential Proprietary
Output Current Line Regulation
500 mA / 3 LEDs / 3.5 Vf

12 • Template • Nov-12
12

Confidential Proprietary

500 mA / 68 uH / 3.5 Vf
12 Vac Buck Operation
• Recall that in a buck topology,
current only flows when Vin is
greater than Vout
Iout
• Since the current isn’t always Vin
flowing, you will need to use a
smaller Rsense value to
reach a desired value
average current.
• So, NCL30160 voltage varies
with 12 Vac input waveform
No current flows
when Vin < Vout

13 • Template • Nov-12
13

Confidential Proprietary
Electronic Ballast Compatibility Table
3 LEDs in series, 2 channels in parallel, 1 A
Parameter
VIN
IIN
PIN
Power Factor
VLED
ILED
PLED
Efficiency

Lightech LET-75
120.5 V
72.08 mA
7.746 W
0.892
8.77 V
0.638 A
6.669 W
86.1%

Hatch RS12-80M
120.4 V
76.14 mA
8.254 W
0.900
9.14 V
0.685 A
7.157 W
86.7%

Lightech LET-60
120.2 V
72.65 mA
7.862 W
0.900
8.84 V
0.647 A
6.779 W
86.2%

Eurofase 0084
120.3 V
68.98 mA
7.244 W
0.873
8.70 V
0.606 A
6.342 W
87.6%

Hatch RS12-30MLED
120.2 V
83.11 mA
9.491 W
0.950
9.26 V
0.715 A
7.461 W
78.6%

Lightech LET-60
120.1 Vac
77.08 mA
8.057 W
0.870
4.69 V
0.942 A
6.703 W
83.2%

Eurofase 0084
120.0 Vac
73.81 mA
7.693 W
0.869
4.53 V
0.904 A
6.452 W
83.9%

Hatch RS12-30M-LED
120.1 Vac
90.91 mA
9.989 W
0.915
5.45 V
1.07 A
7.618 W
76.3%

2 LEDs in series, 2 channels in parallel, 0.7 A
Parameter
VIN
IIN
PIN
Power Factor
VLED
ILED
PLED
Efficiency

14 • Template • Nov-12
14

Lightech LET-75
120.2 Vac
75.77 mA
7.925 W
0.870
4.58 V
0.927 A
6.589 W
83.1%

Hatch RS12-80M
120.1 Vac
78.26 mA
8.414 W
0.895
4.97 V
0.986 A
7.017 W
83.4%

Confidential Proprietary
NCL30160 Application Schematic

• 12 Vdc or 24 Vdc / up to 1 A application
15 • Template • Nov-12
15

Confidential Proprietary
Efficiency Performance
300 mA

1A
4 LEDs

4 LEDs
3 LEDs

3 LEDs

2 LEDs

2 LEDs

16 • Template • Nov-12
16

Confidential Proprietary
Design Tools / Support
• Excel based tool
• Eval boards
• NCL30160GEVB

• Design notes
• 24 V LED Light Strip

17 • Template • Nov-12
17

Confidential Proprietary
Comparison
NCL30160
6.3 - 40V

XXXX
ZXLD1360
7 - 30 V

XXXX
PT4115
8 - 30V

XXXX
LM3404
6 - 42 V

NCP3065
3 - 40 V

NCL30100
6 - 18 V

Input Voltage
Continuous
Output Current
Switch
Fsw
Sense Method
Duty Cycle
FB Voltage

1.0 A

1.0 A

1.2 A

1.2 A

1.2 A

N/A

50mohm
50 - 1400 kHz
Peak
100% max
0.2 V

1000mohm
50 - 500 kHz
Average
70% max
1.25 V

600mohm
100 - 1000 kHz
Peak
~90% max
1.23 V

750mohm
50 - 1000 kHz
Peak
~ 70% max
0.2 V

Controller
50 - 500 kHz
Peak
~ 85% max
1.2 V

Topology

Buck

Buck

Buck

Buck

1000mohm (eq)
50 - 250 kHz
Average
~ 85% max
0.25 V
Buck, Boost,
Buck/Boost

Package Rja

85 °C/W

125 °C/W

45 °C/W

155 / 50 °C/W

85 C/W

178 C/W

Package

SO-8

TSOT-23-5

SO-8EP

SO-8 / SO-8EP

SO-8 / PDIP-8 /
DFN-8

TSOP-6

Controller
Dedicated
Dimming Pin
Thermal
Protection
Control
Methodology

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

NO

NO

YES

NO

YES

YES

YES

NO

Hysteretic

Hysteretic

Hysteretic

Hysteretic

Hysteretic

Hysteretic

18 • Template • Nov-12
18

Confidential Proprietary

Buck
NCL30161 - Buck Regulator for
Driving High Power LEDs
Value Proposition
The NCL30161 is a hysteretic step−down, constant−current driver for high power LEDs. Ideal for automotive,
industrial and general lighting applications utilizing minimal external components.
Typical Application diagram & Package info

Features
•
•
•
•
•
•
•
•

VIN Range 6.3 V to 40 V
Short LED Shutdown Protection
No Control Loop Compensation Required
Adjustable LED Current
Single Pin Brightness and Enable/Disable Control Using PWM
Supports All−Ceramic Output Capacitors and Capacitor−less Outputs
Thermal Shutdown Protection
Capable of 100% Duty Cycle Operation

With
external
mosfet

Benefits
• Hysteretic control provides good power supply rejection and fast
response during load transients
• Dedicated PWM input (DIM/EN) enables a wide range of pulsed
dimming
• Uses smaller external components minimizing space and cost.
• Protection features include resistor−programmed constant LED
current, shorted LED protection, under−voltage and thermal
shutdown.

Market & Applications
•
•
•
•
•

LED Driver
Constant Current Source
Automotive Lighting
General Illumination
Industrial Lighting
19 • Template • Nov-12
19

Ordering info & Support
NCL30161MNT2G
Package – 3mm x 3mm DFN10
Confidential Proprietary
Smaller Size Solution
1.8 mm*3.8 mm*1 mm

13 mm*mm
L1
1

VIN

2

NCL30161
NTLJF4156N
3mm*3mm

D2

U1A
10
9
11
7
6

C1

Gate
CS
VIN
NC
/DIMM/ENGND
NC
NC
ROT
VCC

R2
C2

ROT

0

1
2
14
4
5

L1
0

VIN

1

Analog Dimming

D2

NCL30160
R3
R2

U1A

5mm*6mm*1.1mm
36.8 mm*mm

10
9
11
7
6

C1
0

Gate
CS
VIN
NC
/DIMM/ENGND
NC
NC
ROT
VCC

ROT

1
2
14
4
5

R2
C2
0

20 • Template • Nov-12
20

Confidential Proprietary

2
Increase the input voltage
L1
VIN

1

R1
1k

D2

Q1

C1

D1

U1A

C1
0

10
9
11
7
6

Gate
CS
VIN
NC
/DIMM/ENGND
NC
NC
ROT
VCC

ROT

1
2
14
4
5

R2
C2
0

21 • Template • Nov-12
21

Confidential Proprietary

2
Thank you

22 • Template • Nov-12
22

Confidential Proprietary
Block Diagram
50mΩ
MOSFET

26 • Template • Nov-12
26

Confidential Proprietary

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LED Drivers for MR16 Lamps

  • 1. LED Drivers for MR16 Lamps NCL30160/NCL30161 1
  • 2. LED Driver DC-DC Decision Tree Wide input Voltage LED Driver Selector Vin < 40V Step-down (Buck) Vout < Vin Step-up (Boost) Vout > Vin SEPIC/Buck-Boost Vout < = > Vin NCP3065/6 <350mA Is Vout > 40V YES Determine Iout? > 1.2A NO < 1.2A NCP3065/6 Boost Controller 2 • Template • Nov-12 2 > 1.3A NCP3065/6 Boost Converter What is the Switch current NCP3163 up to 3A Switch CAT4201 Hysteretic Buck Converter NCP3065/6 Boost Controller Confidential Proprietary NCP3065/6 Buck Converter NCP3065/6 Buck Controller NCL30160 Buck Converter < 1.3A NCL30161 Buck Controller NCL30100 Buck Controller
  • 3. NCL30160 – HB-LED Regulator Value Proposition The NCL30160 is an NFET hysteretic step-down, constant-current driver for high power LEDs. A dedicated PWM input (DIM) enables wide range of pulsed dimming. Switching frequency up to 1.4 MHz, minimizing space and cost. Intended for continuous conduction mode operation, thus no output capacitor is needed Unique Features • 50 mΩ integrated MOSFET • Capable of 100% max duty cycle Benefits Application Data • High efficiency solution • Wide input voltage range capability • Input voltage from 6.3 V to 40 V input Others Features • Up to 1.4 MHz switching frequency • Dedicated PWM dimming pin / low power • No control loop compensation required • 1.5 A average current capability shutdown Market & Applications • • Architectural: MR-16 Area Lighting: Light strips, Landscape, Under-cabinet High Efficiency 50mΩ MOSFET Dedicated DIM Pin Ordering & Package Information • • 3 • Template • Nov-12 3 SOIC-8 NCL30160 Confidential Proprietary
  • 4. NCL30160 Key Features Vcc operation from 6.3-40 V LEDs are connected to Vin 1 A /50 mΩ Integrated MOSFET Dedicated Dimming Input Adjustable current sense threshold Adjustable Initial off-time control 4 • Template • Nov-12 4 Confidential Proprietary
  • 5. Common Vin Multi-string Connection D1 D4 D10 D6 D11 D13 D3 D2 D13 1u 1u L2 NCL 30160 L1 NCL 30160 R2 R3 L3 1u L3 NCL 30160 R3 Reduce the connection lines for the multi-string LEDs 5 • Template • Nov-12 5 Confidential Proprietary D9 D8 D8 1u R1 D10 D9 D15 NCL 30160 D12 D12 D7 D17 D5
  • 6. Functional Description • The NCL30160 uses a hysteretic control of the output current. It aims to keep the peak and valley of the current ripple at a set threshold level. • When the FET is on and the current is rising, the current is continuously sensed through a resistor until it sees the peak current, and then turns off. • When the FET is off and the current is falling, a timer is used for the offtime duration. When the off-time ends, the valley current is sensed, and adjusts the next off-time if needed. 6 • Template • Nov-12 6 Confidential Proprietary
  • 7. Peak Current – Fixed Off Time Operating Principle D1 VIN CIN L1 No Output Cap LED LX VIN DIM/Enable ROT CS NCL30160 RSENSE ROT PWM VCC GND Cvcc •Red Path show current flow when switch is ON •Green Path shows current flow when switch is OFF 7 • Template • Nov-12 7 Confidential Proprietary
  • 8. Off-Time Setting Resistor • Since the current is not sensed while the MOSFET is off, a timer is used to set the FET off-time duration. • The off-time setting resistor sets the initial FET off-time only, when the part starts up. This allows the LED current to quickly reach its expected level. • To pick the value of the off-time setting resistor: – Calculate off-time: – Calculate resistor value: 8 • Template • Nov-12 8 Confidential Proprietary
  • 9. Dimming Performance • Dimming works by pulsewidth modulation (PWM) on the DIM/Enable pin • The duty ratio of the PWM is equivalent to the amount of dimming 9 • Template • Nov-12 9 Confidential Proprietary
  • 10. NCL30160 Schematic • MR-16 12 Vac / up to 1 A application 10 • Template • Nov-12 10 Confidential Proprietary
  • 11. Efficiency Performance 350 mA / 3.5 Vf 11 • Template • Nov-12 11 750 mA / 3.5 Vf Confidential Proprietary
  • 12. Output Current Line Regulation 500 mA / 3 LEDs / 3.5 Vf 12 • Template • Nov-12 12 Confidential Proprietary 500 mA / 68 uH / 3.5 Vf
  • 13. 12 Vac Buck Operation • Recall that in a buck topology, current only flows when Vin is greater than Vout Iout • Since the current isn’t always Vin flowing, you will need to use a smaller Rsense value to reach a desired value average current. • So, NCL30160 voltage varies with 12 Vac input waveform No current flows when Vin < Vout 13 • Template • Nov-12 13 Confidential Proprietary
  • 14. Electronic Ballast Compatibility Table 3 LEDs in series, 2 channels in parallel, 1 A Parameter VIN IIN PIN Power Factor VLED ILED PLED Efficiency Lightech LET-75 120.5 V 72.08 mA 7.746 W 0.892 8.77 V 0.638 A 6.669 W 86.1% Hatch RS12-80M 120.4 V 76.14 mA 8.254 W 0.900 9.14 V 0.685 A 7.157 W 86.7% Lightech LET-60 120.2 V 72.65 mA 7.862 W 0.900 8.84 V 0.647 A 6.779 W 86.2% Eurofase 0084 120.3 V 68.98 mA 7.244 W 0.873 8.70 V 0.606 A 6.342 W 87.6% Hatch RS12-30MLED 120.2 V 83.11 mA 9.491 W 0.950 9.26 V 0.715 A 7.461 W 78.6% Lightech LET-60 120.1 Vac 77.08 mA 8.057 W 0.870 4.69 V 0.942 A 6.703 W 83.2% Eurofase 0084 120.0 Vac 73.81 mA 7.693 W 0.869 4.53 V 0.904 A 6.452 W 83.9% Hatch RS12-30M-LED 120.1 Vac 90.91 mA 9.989 W 0.915 5.45 V 1.07 A 7.618 W 76.3% 2 LEDs in series, 2 channels in parallel, 0.7 A Parameter VIN IIN PIN Power Factor VLED ILED PLED Efficiency 14 • Template • Nov-12 14 Lightech LET-75 120.2 Vac 75.77 mA 7.925 W 0.870 4.58 V 0.927 A 6.589 W 83.1% Hatch RS12-80M 120.1 Vac 78.26 mA 8.414 W 0.895 4.97 V 0.986 A 7.017 W 83.4% Confidential Proprietary
  • 15. NCL30160 Application Schematic • 12 Vdc or 24 Vdc / up to 1 A application 15 • Template • Nov-12 15 Confidential Proprietary
  • 16. Efficiency Performance 300 mA 1A 4 LEDs 4 LEDs 3 LEDs 3 LEDs 2 LEDs 2 LEDs 16 • Template • Nov-12 16 Confidential Proprietary
  • 17. Design Tools / Support • Excel based tool • Eval boards • NCL30160GEVB • Design notes • 24 V LED Light Strip 17 • Template • Nov-12 17 Confidential Proprietary
  • 18. Comparison NCL30160 6.3 - 40V XXXX ZXLD1360 7 - 30 V XXXX PT4115 8 - 30V XXXX LM3404 6 - 42 V NCP3065 3 - 40 V NCL30100 6 - 18 V Input Voltage Continuous Output Current Switch Fsw Sense Method Duty Cycle FB Voltage 1.0 A 1.0 A 1.2 A 1.2 A 1.2 A N/A 50mohm 50 - 1400 kHz Peak 100% max 0.2 V 1000mohm 50 - 500 kHz Average 70% max 1.25 V 600mohm 100 - 1000 kHz Peak ~90% max 1.23 V 750mohm 50 - 1000 kHz Peak ~ 70% max 0.2 V Controller 50 - 500 kHz Peak ~ 85% max 1.2 V Topology Buck Buck Buck Buck 1000mohm (eq) 50 - 250 kHz Average ~ 85% max 0.25 V Buck, Boost, Buck/Boost Package Rja 85 °C/W 125 °C/W 45 °C/W 155 / 50 °C/W 85 C/W 178 C/W Package SO-8 TSOT-23-5 SO-8EP SO-8 / SO-8EP SO-8 / PDIP-8 / DFN-8 TSOP-6 Controller Dedicated Dimming Pin Thermal Protection Control Methodology NO NO NO NO YES YES YES YES YES YES NO NO YES NO YES YES YES NO Hysteretic Hysteretic Hysteretic Hysteretic Hysteretic Hysteretic 18 • Template • Nov-12 18 Confidential Proprietary Buck
  • 19. NCL30161 - Buck Regulator for Driving High Power LEDs Value Proposition The NCL30161 is a hysteretic step−down, constant−current driver for high power LEDs. Ideal for automotive, industrial and general lighting applications utilizing minimal external components. Typical Application diagram & Package info Features • • • • • • • • VIN Range 6.3 V to 40 V Short LED Shutdown Protection No Control Loop Compensation Required Adjustable LED Current Single Pin Brightness and Enable/Disable Control Using PWM Supports All−Ceramic Output Capacitors and Capacitor−less Outputs Thermal Shutdown Protection Capable of 100% Duty Cycle Operation With external mosfet Benefits • Hysteretic control provides good power supply rejection and fast response during load transients • Dedicated PWM input (DIM/EN) enables a wide range of pulsed dimming • Uses smaller external components minimizing space and cost. • Protection features include resistor−programmed constant LED current, shorted LED protection, under−voltage and thermal shutdown. Market & Applications • • • • • LED Driver Constant Current Source Automotive Lighting General Illumination Industrial Lighting 19 • Template • Nov-12 19 Ordering info & Support NCL30161MNT2G Package – 3mm x 3mm DFN10 Confidential Proprietary
  • 20. Smaller Size Solution 1.8 mm*3.8 mm*1 mm 13 mm*mm L1 1 VIN 2 NCL30161 NTLJF4156N 3mm*3mm D2 U1A 10 9 11 7 6 C1 Gate CS VIN NC /DIMM/ENGND NC NC ROT VCC R2 C2 ROT 0 1 2 14 4 5 L1 0 VIN 1 Analog Dimming D2 NCL30160 R3 R2 U1A 5mm*6mm*1.1mm 36.8 mm*mm 10 9 11 7 6 C1 0 Gate CS VIN NC /DIMM/ENGND NC NC ROT VCC ROT 1 2 14 4 5 R2 C2 0 20 • Template • Nov-12 20 Confidential Proprietary 2
  • 21. Increase the input voltage L1 VIN 1 R1 1k D2 Q1 C1 D1 U1A C1 0 10 9 11 7 6 Gate CS VIN NC /DIMM/ENGND NC NC ROT VCC ROT 1 2 14 4 5 R2 C2 0 21 • Template • Nov-12 21 Confidential Proprietary 2
  • 22. Thank you 22 • Template • Nov-12 22 Confidential Proprietary
  • 23. Block Diagram 50mΩ MOSFET 26 • Template • Nov-12 26 Confidential Proprietary