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UPSL101 Datasheet(PDF) 6 Page - Unisonic Technologies

Part # UPSL101
Description  ISOLATED, PRIMARY SIDE CONTROL LED LIGHTING DRIVER
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UPSL101 Datasheet(HTML) 6 Page - Unisonic Technologies

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UPSL101
Preliminary
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 8
www.unisonic.com.tw
QW-R125-027.b
FUNCTION 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 principle of operation can be understood by referring to the block diagram.
Startup
The VCC 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
VCC voltage reaches UVLO(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:
CS
LED
R
f
re
V
*
2
N
I
N-Turn ratio of primary side to secondary side
VREF-The reference voltage (typical 0.4V)
RCS-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
Connecting State of OCP_TH
Threshold Voltage of OCP
3V
110K
1.5V
0.9V
33K
1.8V
0V
GND
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.


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