UNISONIC TECHNOLOGIES CO., LTD
UPSL101
Preliminary
LINEAR INTEGRATED CIRCUIT
ISOLATED, PRIMARY SIDE
CONTROL LED LIGHTING
DRIVER WITH ACTIVE PFC
DESCRIPTION
The UTC
UPSL101
is a primary side control offline LED
lighting controller which can achieve high power factor and
accurate LED current for an isolate lighting application in a single
converter.
The UTC
UPSL101
can control the LED current accurately
from the primary side information. It can significantly simplify the
LED lighting system design by eliminating the secondary side
feedback components and the opto-coupler. And it integrates
power factor correction function and works in transition mode for
reducing the MOSFET switching losses.
The LED current can be adjusted externally by the sense
resistor RCS at CS pin. The UTC
UPSL101
achieves high
precision current along with excellent line regulation and load
regulation.
The UTC
UPSL101
offers comprehensive protection coverage
with auto-recovery features including V
CC
over voltage protection,
LED open/short circuit protection, over temperature protection,
over current protection, leading edge blanking, V
CC
under voltage
lockout, V
CC
clamp, GATE clamp, etc.
SOP-8
FEATURES
* Over-temperature protection
* Output over voltage protection
* LED open circuit protection
* LED short circuit protection
* Soft-start
* Ultra-low start-up current
* V
CC
under voltage lockout (UVLO)
* Primary-side control with single stage PFC topology
* Transition mode (TM) operation to achieve high efficiency
* Minimized BOM count
* Cycle-by-cycle current limiting (OCP)
* Selectable threshold of OCP
* High current accuracy
* V
CC
over voltage protection
* Analog multiplier for power factor correction
ORDERING INFORMATION
Ordering Number
Package
SOP-8
SOP-8
Packing
Tube
Tape Reel
Lead Free
Halogen Free
UPSL101L-S08-T
UPSL101G-S08-T
UPSL101L-S08-R
UPSL101G-S08-R
Note: xx: Output Voltage, refer to Marking Information.
UPSL101L-xx-S08-R
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Halogen Free
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8
(3) xx: Refer to Marking Information
(4) G: Halogen Free, L: Lead Free
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Copyright © 2013 Unisonic Technologies Co., Ltd
1 of 7
QW-R125-027.a
UPSL101
PIN CONFIGURATION
Preliminary
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION
PIN NAME
ZCD
DESCRIPTION
Zero current detection pin. A negative going edge triggers the turn on signal of the
external MOSFET, connected this pin through a resistor divider from the auxiliary winding
to GND. If ZCD voltage is higher than the over voltage protection (OVP) threshold, the
over voltage condition is detected.
OCP threshold level selecting pin. Connected an external resistor to ground to select the
OCP threshold voltage.
One of the input pin of the internal multiplier. Connected this pin to the tap of resister
divider from the line voltage. The half waves sinusoid signal in this pin is provided a
reference signal for the internal current control loop.
Loop compensation pin. Connect a compensation network to stabilize the LED driver and
achieve a constant LED driver current.
Current sense input pin. The MOSFET current is sensed via a resister.
Ground pin.
Gate drive output pin.
DC supply voltage pin.
PIN NO.
1
2
3
4
5
6
7
8
OCP_TH
MULT
COMP
CS
GND
GATE
V
CC
BLOCK DIAGRAM
V
CC
Regulator &
V
REF
4V
OVP
Por
Soft
drive
Logic
core
LEB
GATE
ZCD
Tdemag
PWM
OCP_TH
MULT
0.4V
Ipk
CS
COMP
GND
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QW-R125-027.a
UPSL101
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
V
CC
Input Voltage to GND
-0.3~30
V
GATE to GND
-0.3~30
V
I/O (Except GATE) to GND
-0.3~7
V
Operating Ambient Temperature
T
A
-20~85
°C
Junction Temperature
T
J
-40~150
°C
Storage Temperature
T
STG
-55~150
°C
Lead Temperature (10 Sec)
T
L
260
°C
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.
RECOMMENDED OPERATING RANGE
PARAMETER
SYMBOL
RATINGS
11~25
UNIT
V
V
CC
Voltage
ELECTRICAL CHARACTERISTICS
(V
CC
=16V, T
A
=25°C, if not otherwise noted.)
SYMBOL
I_V
CC
_ST
I_S
TATIC
U
VLO(ON)
U
VLO(OFF)
V
CC
_C
LAMP
V
CC
_OVP
T_L
EB
Td_OC
I
OCP_
TH
V
TH
_O
CP
From OCP Comparator to
Gate Drive
V
CC
=16V
0V<V
OCP_
TH<0.3V
0.3V<V
OCP_
TH<1.5V
V
OCP_TH
>1.5V
C
OMP
=3V
M
ULT
=From 0 to 0.5V,
C
OMP
=4V
M
ULT
=1V, C
OMP
=2.2V
1μs Delay After Turn Off
TEST CONDITIONS
V
CC
=14V
V
CC
=16V, No Switching
V
CC
Falling
V
CC
Rising
MIN
TYP
0.2
4.0
8
14.6
30
28
20
300
27
38
2.1
1.8
1.5
49
MAX
15
5.5
9
15.6
UNIT
μA
mA
V
V
V
V
ns
ns
μA
V
V
V
V
1.5
0.6
3.8
0.75
4
0.9
0.9
0.12
0.9
4.2
V/V
1/V
V
V
V
V
PARAMETER
Supply Voltage Section
Standby Current
Static Current
V
CC
Under Voltage Lockout Enter
V
CC
Under Voltage Lockout Exit
V
CC
Clamp Protection
V
CC
Over Voltage Protection
Current Sense Section
Lead Edge Blanking Time
OCP Propagation Delay
Source Current of OCP_TH PIN
Threshold Voltage of Over Current
Protection
Multiplier Section
Linear Operating Range
Output Max. Slope
Gain
ZCD Section
Output Over Voltage Protection
ZCD Low Voltage Detection
When ZCD Rise up This Voltage,
Demagnetization Began
When ZCD Drop Below This
Voltage, Demagnetization Finished
7
13.6
V
MULT
∆V
CS
/∆V
MULT
K
V
OVP
V
ZCD
_L
OW
V
TH
_D
EM
_H
V
TH
_D
EM
_L
0~3
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QW-R125-027.a
UPSL101
PARAMETER
Gm amplifier section
EA Reference Voltage
EA Transconductance Gain
DC Gain
Dynamic Range
Upper Clamp Voltage
Lower Clamp Voltage
EA Maximum Source Current
EA Maximum Sink Current
Watch Dog Section
Re-start Timer Period
Minimum Off Time
Maximum On Time
OTP Section
Over Temperature Protection
Gate Drive Output Section
Output Low Level
Output High Level
Output Clamping Voltage
Rising Edge Time
Falling Edge Time
Preliminary
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
SYMBOL
V
REF
G
M
G
AIN
V
OUT
V
COMP
_H
V
COMP
_L
I
SOURCE
_Max
I
SINK
_Max
T
OFF
_Max
T
OFF
_ Min
T
ON
_Max
OTP_ON
V
OL
V
OH
V
CLAMP
T
R
T
F
V
CC
=16V @ I
OUT
=100mA
V
CC
=16V @ I
OUT
=100mA
V
CC
=28V
C
L
=1nF, 10~90%
C
L
=1nF, 10~90%
120
TEST CONDITIONS
MIN
394
35
1.2~4.5
TYP
400
100
45
MAX
406
UNIT
mV
μS
dB
V
V
V
μA
μA
μs
μs
μs
160
2.5
8
30
20
16
150
70
°C
V
V
V
nS
nS
6
1
100
35
50
2
44
140
UNISONIC TECHNOLOGIES CO., LTD
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4 of 7
QW-R125-027.a
UPSL101
FUNCTION DESCRIPTION
Preliminary
LINEAR INTEGRATED CIRCUIT
The UTC
UPSL101
is a primary side control offline LED lighting controller which can achieve high power factor
and accurate LED current for an isolate lighting application in a single converter. The UTC
UPSL101
can control the
LED current accurately from the primary side information. It can significantly simplify the LED lighting system design
by eliminating the secondary side feedback components and the opto-coupler. And it integrates power factor
correction function and works in transition mode for reducing the MOSFET switching losses.
The principle of operation can be understood by referring to the block diagram.
Startup
The V
CC
pin of UTC
UPSL101
is connected to the line input through a resistor. A large value startup resistor can
be used to minimize the power loss in application because the start current of UTC
UPSL101
is very low. When the
V
CC
voltage reaches U
VLO(OFF)
, the internal startup circuit is disabled and the IC turns on.
Operating Current
The operating current of UTC
UPSL101
is as low as 1.5mA. Good efficiency and very low standby power can be
achieved.
Transition Mode Operation
During the external MOSFET on time, the rectified input voltage is applied across the primary side inductor and
the primary current increases linearly from zero to the peak value. When the external MOSFET turns off, the energy
stored in the inductor forces the secondary side diode to be turn on, and the current of the inductor begins to
decrease linearly from the peak value to zero, this decreasing is also reflected on the auxiliary winding. UTC
UPSL101
performs zero current detection (ZCD) through ZCD pin by monitoring the voltage activity on the auxiliary
windings in series with external resistors. When ZCD pin voltage falls below 0.3V, an internal ZCD comparator is
triggered and generates the turn on signal of the external MOSFET.
LED Constant Current Regulation
The proprietary real current control method allows the UTC
UPSL101
controlling the secondary side LED current
from the primary side information. The LED mean current can be calculated approximately as:
N Vref
I
LED
≈
*
2 R
CS
N-Turn ratio of primary side to secondary side
V
REF
-The reference voltage (typical 0.4V)
R
CS
-The sensing resistor connected between the MOSFET source and GND.
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC
UPSL101.
The switch current is detected by a sense resistor into
the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A leading-edge blanking
is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer needed. PWM
duty cycle is determined by the current sense voltage and the voltage at pin COMP.
Threshold of OCP Selection
The threshold voltage level of OCP is selected by the voltage of OCP_TH pin. The UTC
UPSL101
provides the
source current equal to approximately 28μA through OCP_TH pin. So the proper resistor can be connected with the
OCP_TH pin to GND in order to generate the voltage needed. If OCP_TH pin is connected with 33K resistor, the
threshold voltage of OCP is about 1.8V; If OCP_TH pin is connected with 110K resistor, the threshold voltage of
OCP is about 1.5V; If OCP_TH pin is connected with GND directly, the threshold voltage of OCP is about 2.1V.
Voltage of OCP_TH Pin
3V
0.9V
0V
Connecting State of OCP_TH
110K
33K
GND
Threshold Voltage of OCP
1.5V
1.8V
2.1V
Maximum and Minimum On-Time
The minimum on-time of the system is determined by the LEB time. The IC limits the on-time to a maximum time
of approximately 50μs.
UNISONIC TECHNOLOGIES CO., LTD
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QW-R125-027.a
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