led drivers for mr16 lamps
DESCRIPTION
LED Drivers for MR16 LampsTRANSCRIPT
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LED Drivers for MR16 LampsNCL30160/NCL30161
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LED Driver DC-DC Decision TreeWide input VoltageLED Driver Selector
Vin < 40V
Step-down (Buck)
Vout < Vin
DetermineIout?
NCP3065/6 Buck
Controller
NCP3065/6 Buck
Converter
CAT4201Hysteretic Buck
Converter
> 1.2A
< 1.2A
<350mA
Step-up (Boost)
Vout > Vin
Is Vout > 40V
NCP3065/6 Boost Controller
NCP3065/6 Boost
Converter
NCP3065/6 Boost
Controller
NOYES
What is theSwitch current
> 1.3A
SEPIC/Buck-BoostVout < = > VinNCP3065/6
NCL30160Buck
Converter
< 1.3A
NCP3163 up to3A Switch
NCL30100Buck
Controller
NCL30161Buck
Controller
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NCL30160 – HB-LED Regulator
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
•50 mΩ integrated MOSFET•Capable of 100% max duty cycle
•Input voltage from 6.3 V to 40 V input
•High efficiency solution•Wide input voltage range capability
•Up to 1.4 MHz switching frequency•Dedicated PWM dimming pin / low power shutdown•No control loop compensation required•1.5 A average current capability
• Architectural: MR-16• Area Lighting: Light strips, Landscape, Under-cabinet
• SOIC-8• NCL30160
Others Features
Ordering & Package Information
Market & Applications
Unique Features Benefits
Value Proposition
Application Data
Dedicated DIM PinHigh Efficiency 50mΩ
MOSFET
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NCL30160 Key Features
LEDs are connected
to Vin
Adjustablecurrent sense
thresholdAdjustable
Initial off-time control
Dedicated Dimming Input
Vcc operationfrom 6.3-40 V
1 A /50 mΩ Integrated MOSFET
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Common Vin Multi-string Connection
R3
1u
L3
D8
D9
D10
D12
D13
R2
1u
L1
D2
D3
D4
D5
D6D17
D1
D7
D11
D15
1u
L2
R1
NCL30160
NCL30160
NCL30160
D13
D12
D10
D9
D8
1u
L3
R3
Reduce the connection lines for the multi-string LEDs
NCL30160
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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 off-time duration. When the off-time ends, the valley current is sensed, and
adjusts the next off-time if needed.
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Peak Current – Fixed Off Time Operating Principle
• Red Path show current flow when switch is ON• Green Path shows current flow when switch is OFF
No Output Cap
PWM
D1
NCL30160ROT
CIN
VIN
VIN
VCC
CS
LX
LED
L1
Cvcc
RSENSE
GND
ROT
DIM/Enable
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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:
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Dimming Performance
• Dimming works by pulse-width modulation (PWM) on the DIM/Enable pin
• The duty ratio of the PWM is equivalent to the amount of dimming
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NCL30160 Schematic• MR-16 12 Vac / up to 1 A application
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Efficiency Performance
350 mA / 3.5 Vf 750 mA / 3.5 Vf
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Output Current Line Regulation
500 mA / 3 LEDs / 3.5 Vf 500 mA / 68 uH / 3.5 Vf
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12 Vac Buck Operation• Recall that in a buck topology,
current only flows when Vin is greater than Vout
• Since the current isn’t always 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
Iout
Vin
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Electronic Ballast Compatibility Table
Parameter Lightech LET-75 Hatch RS12-80M Lightech LET-60 Eurofase 0084 Hatch RS12-30M-LEDVIN 120.2 Vac 120.1 Vac 120.1 Vac 120.0 Vac 120.1 VacIIN 75.77 mA 78.26 mA 77.08 mA 73.81 mA 90.91 mAPIN 7.925 W 8.414 W 8.057 W 7.693 W 9.989 WPower Factor 0.870 0.895 0.870 0.869 0.915VLED 4.58 V 4.97 V 4.69 V 4.53 V 5.45 VILED 0.927 A 0.986 A 0.942 A 0.904 A 1.07 APLED 6.589 W 7.017 W 6.703 W 6.452 W 7.618 WEfficiency 83.1% 83.4% 83.2% 83.9% 76.3%
Parameter Lightech LET-75 Hatch RS12-80M Lightech LET-60 Eurofase 0084Hatch RS12-30M-
LEDVIN 120.5 V 120.4 V 120.2 V 120.3 V 120.2 VIIN 72.08 mA 76.14 mA 72.65 mA 68.98 mA 83.11 mAPIN 7.746 W 8.254 W 7.862 W 7.244 W 9.491 WPower Factor 0.892 0.900 0.900 0.873 0.950VLED 8.77 V 9.14 V 8.84 V 8.70 V 9.26 VILED 0.638 A 0.685 A 0.647 A 0.606 A 0.715 APLED 6.669 W 7.157 W 6.779 W 6.342 W 7.461 WEfficiency 86.1% 86.7% 86.2% 87.6% 78.6%
3 LEDs in series, 2 channels in parallel, 1 A
2 LEDs in series, 2 channels in parallel, 0.7 A
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NCL30160 Application Schematic
• 12 Vdc or 24 Vdc / up to 1 A application
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Efficiency Performance
300 mA 1 A
2 LEDs
3 LEDs
4 LEDs
2 LEDs
3 LEDs
4 LEDs
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Design Tools / Support
• Excel based tool• Eval boards
• NCL30160GEVB
• Design notes• 24 V LED Light Strip
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ComparisonNCL30160 ZXLD1360 PT4115 LM3404 NCP3065 NCL30100
Input Voltage 6.3 - 40V 7 - 30 V 8 - 30V 6 - 42 V 3 - 40 V 6 - 18 VContinuous
Output Current1.0 A 1.0 A 1.2 A 1.2 A 1.2 A N/A
Switch 50mohm 1000mohm 600mohm 750mohm 1000mohm (eq) ControllerFsw 50 - 1400 kHz 50 - 500 kHz 100 - 1000 kHz 50 - 1000 kHz 50 - 250 kHz 50 - 500 kHz
Sense Method Peak Average Peak Peak Average PeakDuty Cycle 100% max 70% max ~90% max ~ 70% max ~ 85% max ~ 85% maxFB Voltage 0.2 V 1.25 V 1.23 V 0.2 V 0.25 V 1.2 V
Topology Buck Buck Buck BuckBuck, Boost, Buck/Boost
Buck
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-8EPSO-8 / PDIP-8 /
DFN-8TSOP-6
Controller NO NO NO NO YES YESDedicated
Dimming PinYES YES YES YES NO NO
Thermal Protection
YES NO YES YES YES NO
Control Methodology
Hysteretic Hysteretic Hysteretic Hysteretic Hysteretic Hysteretic
XXXX XXXX XXXX
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NCL30161 - Buck Regulator for Driving High Power LEDs
Features
Benefits
Value Proposition
• 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
Typical Application diagram & Package info
Ordering info & SupportNCL30161MNT2GPackage – 3mm x 3mm DFN10
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.
• 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
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Smaller Size Solution
0 ROT
0
V IN
D2
U1A
1 176
1 09 2
1 445
1
/D IM M /E NN CR O T
G a teV IN N C
G N DN C
V C C
C S
C2
R2C1
L11 2
3mm*3mm
1.8 mm*3.8 mm*1 mm
5mm*6mm*1.1mm
36.8 mm*mm
13 mm*mm
0 ROT
0
V IN
A n a l o g D i m m i n gD2
U1A
1 176
1 09 2
1 445
1
/D IM M /E NN CR O T
G a teV IN N C
G N DN C
V C C
C S
C2
R2
R2
R3
C1
L11 2
NCL30160
NCL30161NTLJF4156N
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Increase the input voltage
0
C1
R1
1k
ROT
D1
0
D2
U1A
1 176
1 09 2
1 445
1
/D IM M /E NN CR O T
G a teV IN N C
G N DN C
V C C
C S
Q1
C2
R2C1
V INL1
1 2
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Thank you
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Block Diagram
50mΩMOSFET