L4075L-AF5-R [UTC]
40V LED DRIVER WITH INTERNAL SWITCH;
| 型号： | L4075L-AF5-R |
| 厂家： | 
Unisonic Technologies |
| 描述： | 40V LED DRIVER WITH INTERNAL SWITCH 驱动 |
| 文件： | 总5页 (文件大小：188K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
L4075
Preliminary
CMOS IC
40V LED DRIVER WITH
INTERNAL SWITCH
DESCRIPTION
The UTC L4075 is a continuous conduction mode inductive
step-down converter, designed for driving single or multiple series
connected LEDs efficiently from a voltage source higher than the
total LEDs chain voltage. The chip operates from an input supply
between 6V and 40V and provides an externally adjustable output
current of up to 400mA. Depending upon supply voltage and
external components, this can provide up to 30W of output power.
The UTC L4075 includes an integrated output switch and a
high-side output current sensing circuit, which uses an external
resistor to set the nominal average output current.
Output current can be adjusted linearly by applying an external
control signal to the ADJ pin. The ADJ pin will accept either a DC
voltage dimming or a wide range of pulsed dimming. This will
provide either a continuous or a gated output current.
Applying a voltage of 0.2V or lower to the ADJ pin can turn the
output off and switch the chip into a low current standby state.
FEATURES
* 6V~40V input voltage range
* Simple low parts count
* Internal 40V power switch
* High efficiency up to 95%
* Typical 5% output current accuracy
* Single pin on/off and brightness control using DC voltage or PWM
* Up to 1MHz switching frequency
* Protection features:
Open-circuit LED Protection
Thermal shutdown Protection
ORDERING INFORMATION
Ordering Number
Package
SOT-25
Packing
Tape Reel
Lead Free
Halogen Free
L4075G-AF5-R
L4075L-AF5-R
www.unisonic.com.tw
Copyright © 2018 Unisonic Technologies Co., Ltd
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L4075
Preliminary
CMOS IC
MARKING
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
PIN NAME
LX
DESCRIPTION
1
2
3
4
5
Drain of power switch
Ground (0V)
GND
ADJ
Multi-function On/Off and brightness control pin
Current sense input
ISENSE
VIN
Input voltage
BLOCK DIAGRAM
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L4075
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VIN
RATINGS
+50
UNIT
V
Input Voltage
ISENSE Voltage
VIN>5V
VIN<5V
VIN+0.3 ~ VIN-5
VIN+0.3 ~ -0.3
-0.3 ~ +50
-0.3 ~ +6
400
V
VISENSE
V
LX Output Voltage
VLX
VADJ
ILX
V
Adjust Pin Input Voltage
Switch Output Current
V
mA
mW
°C
°C
°C
Power Dissipation
PD
370
Operating Junction Temperature
Operating Temperature Range
Storage Temperature Range
TJ
150
TOPR
TSTG
-40 ~ +85
-55 ~ +150
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL CHARACTERISTICS
PARAMETER
SYMBOL
RATINGS
270
UNIT
°C/W
Junction to Ambient
θJA
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L4075
Preliminary
CMOS IC
ELECTRICAL CHARACTERISTICS (VIN=12V, TAMB=25°C unless otherwise stated) (Note 1)
PARAMETER
SYMBOL
VIN
TEST CONDITIONS
MIN
6
TYP MAX UNIT
Input Voltage
40
80
V
Quiescent Supply Current with Output Off
Quiescent Supply Current with Output
Switching
IINQOFF ADJ Pin Grounded
40
60
μA
IINQON
ADJ Pin Floating
450
600
μA
Mean Current Sense Threshold Voltage
Sense Threshold Hysteresis
ISENSE Pin Input Current
VSENSE
VSENSEHYS
ISENSE
113
±15
8
mV
%
VSENSE=0.1V
10
μA
Measured on ADJ Pin with
Pin Floating
Internal Reference Voltage
VREF
VADJ
1.2
V
V
V
V
External Control Voltage Range On ADJ Pin
for DC Brightness Control
0.3
0.15
0.2
1.2
0.25
0.3
DC Voltage On ADJ Pin to Switch Chip from
Active (On) State to Quiescent (Off) State
DC Voltage On ADJ Pin to Switch Chip from
Quiescent (Off) State to Active (On) State
Resistance Between ADJ Pin and VREF
Continuous LX Switch Current
VADJOFF VADJ Falling
VADJON VADJ Rising
0.2
0.25
RADJ
500
KΩ
A
ILXmean
0.35
LX Switch Leakage Current
ILX(leak)
1
μA
Ω
LX Switch “On” Resistance
RLX
0.9
200
200
1.5
Minimum Switch “ON” Time
TONMIN LX Switch “ON”
TOFFMIN LX Switch “OFF”
ns
ns
Minimum Switch “OFF” Time
PWM Frequency=100Hz,
Brightness Control Range at Low Frequency
PWM Signal
PWM Amplitude=5V,
VIN=15V, Driving 1LED,
L=27μH
DPWM(LF)
1200:1
PWM Frequency=10KHz,
PWM Amplitude=5V,
VIN=15V, Driving 1LED,
L=27μH
Brightness Control Range at Low Frequency
PWM Signal
DPWM(HF)
13:1
154
ADJ Pin Floating L=100Μh
(0.82Ω) IOUT=350mA @
Operating Frequency
fLX
KHz
MHz
VLED=3.4V Driving 1 LED
Recommended Maximum Operating
Frequency
fLXMAX
DLX
1
Recommended Duty Cycle Range of Output
Switch at fLXmax
0.3
0.7
0.9
Internal Comparator Propagation Delay
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TPD
TSD
50
140
20
ns
°C
°C
TSD-HYS
Note: Production testing of the chip is performed at 25°C. Functional operation of the chip and parameters specified
are guaranteed by design, characterization and process control in other temperature.
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L4075
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
VIN (DC)= 6V~40V
C1
1µF
D1
1
5
LX
VIN
UTC L4075
2
3
GND
4
ISENSE
ADJ
Up to 10
LEDs
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all UTC products described or contained herein.
UTC products are not designed for use in life support appliances, devices or systems where malfunction
of these products can be reasonably expected to result in personal injury. Reproduction in whole or in
part is prohibited without the prior written consent of the copyright owner. UTC reserves the right to
make changes to information published in this document, including without limitation specifications and
product descriptions, at any time and without notice. This document supersedes and replaces all
information supplied prior to the publication hereof.
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