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Спецификация NCL30100 изготовлена «ON Semiconductor» и имеет функцию, называемую «Fixed Off Time Switched Mode LED Driver Controller». |
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Детали детали
Номер произв | NCL30100 |
Описание | Fixed Off Time Switched Mode LED Driver Controller |
Производители | ON Semiconductor |
логотип |
27 Pages
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NCL30100
Fixed Off Time Switched
Mode LED Driver Controller
The NCL30100 is a compact switching regulator controller intended
for space constrained constant current high−brightness LED driver
applications where efficiency and small size are important. The
controller is based on a peak current, quasi fixed−off time control
architecture optimized for continuous conduction mode step−down
(buck) operation. This allows the output filter capacitor to be
eliminated. In this configuration, a reverse buck topology is used to
control a cost effective N−type MOSFET. Moreover, this controller
employs negative current sensing thus minimizing power dissipation
in the current sense resistor. The off time is user adjustable through the
selection of a small external capacitor, thus allowing the design to be
optimized for a given switching frequency range. The control loop is
designed to operate up to 700 kHz allowing the designer the flexibility
to use a very small inductor for space constrained applications.
The device has been optimized to provide a flexible inductive
step−down converter to drive one or more high power LED(s). The
controller can also be used to implement non−isolated buck−boost
driver topologies.
Features
• Quasi−Fixed OFF Time, Peak Current Control Method
• N−FET Based Controller Architecture
• Up to 700 kHz Switching Frequency
• Up to >95% Efficiency
• No Output Capacitor Needed
• VCC Operation from 6.35 − 18 V
• Adjustable Current Limit with Negative Sensing
• Inherent Open LED Protected
• Very Low Current Consumption at Startup
• Undervoltage Lockout
• Compact Thin TSOP−6 Pb−Free Package
• −40 to + 125°C Operating Temperature Range
• This is a Pb−Free Device
Typical Applications
• Low Voltage Halogen LED Replacement (MR 16)
• LED Track Lighting
• Landscape Lighting
• Solar LED Applications
• Transportation Lighting
• 12 V LED Bulb Replacement
• Outdoor Area Lighting
• LED Light Bars
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MARKING
DIAGRAM
TSOP−6
(SOT23−6, SC59−6) AAAAYWG
SN SUFFIX
G
1
CASE 318G
1
AAA = Specific Device Code
A =Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
CS 1
6 Gate
GND 2
CT 3
5 VCC
4 IVC
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCL30100SNT1G TSOP−6 3000 / Tape & Reel
(Pb−Free)
†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.
© Semiconductor Components Industries, LLC, 2011
January, 2011 − Rev. 3
1
Publication Order Number:
NCL30100/D
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6.5 – 24 V
+
C1
R3
−
R4
NCL30100
R1
IC1
NCL30100
CS DRV
GND VCC
CT IVC
C2
C3
R2
D2
LED1
D1
L1
Q1
Figure 1. Typical Application Example of the LED Converter
LED2
LEDX
PIN FUNCTION DESCRIPTION
Pin N5 Pin Name
Function
1 CS Current sense input
2 GND
Ground
3 CT
Timing capacitor
4 IVC Input voltage compensation
5 VCC
Input supply
6 DRV
Driver output
Pin Description
A resistor divider consisting of R3 and R4 is used to set the peak current
sensed through the MOSFET switch
Power ground.
Capacitor to establish the off time duration
The current injected into the input varies the switch off time and IPK allowing for
feedforward compensation.
Supply input for the controller. The input is rated to 18 V but as illustrated
Figure 1, a simple zener diode and resistor can allow the LED string to be
powered from a higher voltage
Output drive for an external power MOSFET
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IVC
CT
NCL30100
Input Voltage
Regulator
VDD Reference
Iref Regulator
VOffset
OFF Time
Comparator
0−3.9 V
Undervoltage
Lockout
VCC
6.35/5.85 V
50 mA
CS
GND
12.5−50 mA
Current Sense
Comparator
Set
Reset
SQ
SET
CLR
RQ
Gate Driver
DRV
Figure 2. Simplified Circuit Architecture
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
IVC Pins Voltage Range
VCC 18 V
IVC
−0.3 to 18
V
CS and CT Pin Voltage Range
Vin
−0.3 to 10
V
Thermal Resistance, Junction−to−Air
RqJA
178 °C/W
Junction Temperature
TJ 150 °C
Storage Temperature Range
Tstg
−60 to +150
°C
ESD Voltage Protection, Human Body Model (HBM)
VESD−HBM
2 kV
ESD Voltage Protection, Machine Model (MM)
VESD−MM
200 V
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(s) contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per JEDEC Standard JESD22−A114E
Machine Model 200 V per JEDEC Standard JESD22−A115−A
2. This device meets latchup tests defined by JEDEC Standard JESD78.
3. Moisture Sensitivity Level (MSL) 1.
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