Datasheet

UNISONIC TECHNOLOGIES CO., LTD
USL1650
Preliminary
LINEAR INTEGRATED CIRCUIT
HIGH EFFICIENCY PWM
BUCK LED DRIVER
CONTROLLER

DESCRIPTION
The UTC USL1650 is a PWM mode step-down converter (with
a high voltage power MOSFET with SOP8 package). By well
regulating a constant output current. The output duty cycle of the
UTC USL1650 can be up to 100% for wider input voltage
application.
The UTC USL1650 is available in a SOP-8 package.

FEATURES
* Universal input voltage range with off-line topology
* Programmable constant LED current
* Output LED string short protection
* Output LED string open protection
* Dimmable LED current by ACTL
* OCP
* Built-in OTP

ORDERING INFORMATION
Ordering Number
USL1650G-S08-R
USL1650G-S08-R

Package
SOP-8
Packing
Tape Reel
(1)Packing Type.
(1) R: Tape Reel
(2)Package Type
(2) S08: SOP-8
(3)Green Package
(3) G: Halogen Free and Lead Free
MARKING
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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USL1650
Preliminary

PIN CONFIGURATIONS

PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7, 8

PIN NAME
VCC
VIN
ACTL
VC
SENSE
GND
NC
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
Power supply.
Power MOS drain.
Analog dimming control.
Compensation pin.
LED current sense input pin.
Ground of the chip.
BLOCK DIAGRAM
VCC
1
+
-
17V/7.5V
35V
SENSE 5
VC
+
-
+
-
UVLO
Internal Bias
& Vref
All Blocks
VCC OK
VCCOVP
EN
2 VIN
CC
4
Current
Waveform
modulation
VREF
+
-
+
-
R Q
Driver
stage
R
S
OSC
ACTL 3
Dimming
Function
6
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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USL1650

Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Input Voltage
VCC
40
V
GATE Voltage
VGATE
14
V
ACTL Voltage (Note 1)
VACTL
8
V
VC Voltage
VVC
6
V
SENSE Voltage
VSENSE
-0.3~6
V
Power Dissipation
TA=25°C
PD
0.392
W
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-65~+150
°C
Notes: 1. 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.
2. If the ACTL pin is connected with a serial 1MΩ resistor, the maximum voltage can go up to 36V.

RECOMMENDED OPERATING CONDITIONS (Note)
PARAMETER
SYMBOL
RATINGS
Supply Input Voltage
VCC
17~32
Junction Temperature Range
TJ
-40~125
Note: The device is not guaranteed to function outside its operating conditions.

THERMAL DATA
PARAMETER
Junction to Ambient

UNIT
V
°C
SYMBOL
θJA
RATING
225
UNIT
°C/W
ELECTRICAL CHARACTERISTICS (VCC=24VDC, TA=25°C, unless otherwise specified)
PARAMETER
Input Start-Up Voltage
Minimum Operation Voltage After Star t-Up
Input Quiescent Current
Maximum Startup Current in VCC
Hiccup Operation
Input Shutdown Current
Over Voltage Protection
Current Sense Voltage
Switching Frequency
Oscillator Maximum Duty Cycle
Minimum Turn-On Time
Power MOSFET
Static Drain-Source On-State Resistance
Drain-Source Voltage
Drain-Source Leakage Current
ACTL LED Dimming
Analog Dimming ACTL Pin Input Current
Analog Dimming Range
High Level
Analog Dimming
Threshold Voltage Low Level
VC Threshold for PWM Switch Off
Thermal Protection
Thermal Shutdown Temperature
SYMBOL
VST
VIN(MIN)
IQC
IST(MAX)
ISHDN
VOVP
VSENSE
fSW
DMAX
tON(MIN)
RDS(ON)
VDSS
IDSS
After Start-Up, VCC=24V
Maximum ICC at Low End of
VCC
Before Start-Up, VCC=15V
VCC Pin
MIN
15
6.0
32.5
38
TYP MAX UNIT
17
19
V
7.5
9.0
V
1.65 5.0 mA
250
300
μA
0.1
35.5
160
47
5.0
36.5
μA
V
mV
kHz
%
ns
11.5
15.5
VC=3V
55
100
300
VGS=10V, ID=0.5A
VGS=0V
VDS=650V, VGS=0V
650
10
IACTL
1
0
VVC
0
1.1
TSD
150
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TEST CONDITIONS
1.2
0.1
1.25
5
1.3
1.3
1.4
Ω
V
μA
μA
V
V
V
V
°C
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LINEAR INTEGRATED CIRCUIT
2 1
TYPICAL APPLICATION CIRCUIT
2
1
2
1
2 1

Preliminary
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. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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