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UNISONIC TECHNOLOGIES CO., LTD UPSL100 Preliminary LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 7 Copyright © 2013 Unisonic Technologies Co., Ltd QW-R125-028.a HIGH PRECISION CC PRIMARY-SIDE LED CONTROLLER  DESCRIPTION The UTC UPSL100 is a high performance offline PSR controller for LED lighting, which can achieve accurate LED current and low system cost for an isolated lightin g application in a single stage converter. Consequently, opto-coupler and TL431 could be eliminated. Constant Current (CC) control is intergrated as shown in the figure below. In CC control, the current can be adjusted externally by the sense resistor R S at CS pin. The chip consumes low start up current and very low operat ion current (typical 350 μA), it can achieve high efficiency and low standby power consumption. The UTC UPSL100 offers comprehensive protection coverage with auto-recovery features including open loop protection, short circuit protection, cycle-by-cycle current limiting, V DD over voltage protection, built-in leading edge blanking, V DD under voltage lockout (UVLO), etc.  FEATURES SOT-25 * Primary-side sensing and regulation without TL431 and opto-coupler * High precision constant current regulation at universal AC input * Low system cost and high efficiency * Built-in primary winding inductance compensation * Programmable CC regulation * Drivability for BJT switch * Short circuit protection * Ultra low start-up current (Typ. 1μA) * Open loop protection * Built-in leading edge blanking (LEB) * Cycle-by-cycle current limiting * V DD under voltage lockout with hysteresis * VDD over voltage protection  ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free UPSL100-AF5-R UPSL100G-AF5-R SOT-25 Tape Reel

UPSL100 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 7 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 8 . a  PIN CONFIGURATION  PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION

1 GND Ground

2 CS Current sense input. 3 BASE Base driver with current limit for power BJT. 4 INV The voltage feedback from auxiliary winding. 5 V DD Power supply.  BLOCK DIAGRAM VDD INV GND CC Controller UVLO Logic Control Base Drive LEB BASE CSOCP POR OVP 5V Internal Supply OSC OTP

UPSL100 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 7 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 8 . a  ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT VDD Voltage -0.3~30 V BASE Voltage -0.3~7 V CS Input Voltage -0.3~7 V INV Input Voltage -0.3~7 V Junction Temperature T J -40~150 °C Storage Temperature T STG -55~150 °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.  CAL CHARACTERISTICS (VDD=15V, TA=25°C, if not otherwise noted.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply Voltage (VDD) Section Start up Current I START-UP V DD=11V 0.1 3 μA Static Current I STATIC V DD=15V 350 500 μA VDD Under Voltage Lockout Enter U VLO(ON) 5.0 6.0 7.6 V VDD Under Voltage Lockout Exit U VLO(OFF) 11.5 12.5 13.5 V VDD Over Voltage Protection V DD_OVP 23 26 29 V Current Sense Input Section Lead Time TLEB 0.5 μS Over Current Threshold V th_OCP 1.21 1.23 1.25 V OCP Propagation Delay T d_OC From OCP Comparator to Base Drive 100 nS INV Input Section Maximum Pause T PAUSE_MAX 710 765 810 μS BASE Drive Section Base Sourcing Maximum Current I S_MAX 40 50 60 mA Base Sourcing Current After Pre-off I S_PREOFF 1.9 2.4 2.9 mA Base Drive Low Side On Resistor R DSON_l 1.8 Ω

UPSL100 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 7 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 8 . a  OPERATION DESCRIPTION The UTC UPSL100 is a cost effective PSR controller optimized for off-line LED lighting applications which can achieve accurate LED current. It operates in primar y side sensing and regulation, eliminating the need of opto-coupler and TL431, which makes the solution simple , small and low cost. Proprietary built-in CC control meeting accurate LED current. Startup Current and Start up Control Startup current of UTC UPSL100 is designed to be very low so that V DD can be charged up quickly. A large value startup resistor can therefore be used to minimize the power loss in application. Operating Current The operating current of UTC UPSL100 is designed to be very low so that V DD could be charged up above UVLO threshold and starts up quickly. Good efficiency and very low standby power is achieved with the low operating current. Adjustable CC point In UTC UPSL100, the CC point can be externally adjusted by external current sense resistor R S at CS pin as illustrated in typical application diagram. The larger RS is, the smaller CC point is, and vice versa. Principle of CC Operation To support the UTC UPSL100 proprietary CC control, s ystem needs to be designed in DCM mode for flyback system. For flyback operating in DCM, the output current Iout is given by out PSWPout V/ηIFL2 1=I ( 1 ) Where LP indicates the inductance of primary winding and IP is the peak current of primary winding. Refer to the equation 1, the change of the primary winding inductance results in the change of the constant output current. To compensate the change from variations of primary winding inductance, the switching frequency is locked by an internal loop such that the switching frequency is emagD SW T2 1=F ( 2 ) Since TDemag is inversely proportional to the inductance, as a result, the product L P and fSW is constant, thus output current will not change as primary winding inductance changes. Up to ±10% variation of the primary winding inductance can be compensated. The output LED current is S thoc out R VN4 1=I ( 3 ) Where N is the ratio of transformer between primary side winding and secondary winding.

UPSL100 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 7 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 8 . a  OPERATION DESCRIPTION(Cont.) CS and LEB Cycle-by-Cycle current limiting is offered in UTC UPSL100. The switch current is detected by a sense resistor into the CS pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial power BJT on state so that the external RC filtering on sense input is no longer needed. Protection Control Good power supply system reliability is achieved with its ri ch protection features including Cycle-by-Cycle current limiting (OCP), V DD over voltage protection, feedback loop open prot ection, short circuit protection and Under Voltage Lockout on VDD (UVLO). Because of the coupling between secondary winding and auxiliary winding, the voltage at V DD pin will rise up if the output of secondary side is open-circuited, when V DD pin voltage is larger than 27V, the UTC UPSL100 will stop sending pulses to BASE pin and enter auto restart mode. If the output of secondary side is short-circuited, the V DD voltage will drop down and the system enters under voltage lockout protection. Base Drive The drive is a push pull stage with supply voltage V DD. It provides the driving current for the external power bipolar transistor. The output signal is current limit to Is_max (typical 30mA).

UPSL100 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 7 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 8 . a  TYPICAL APPLICATION CIRCUIT

UPSL100 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 of 7 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 8 . a 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.