THL6521 / THL6523_Rev.1.01_E THL6521 / THL6523 1channel LED Driver Description Features THL6521 / THL6523 are a 1 channel LED driver. THL6521 / THL6523 have a built-in boost converter, since back light system can consist of 1 chip. Soft start / Over current protection / Under voltage lock out protection / Over voltage protection / Thermal shut down are built in. Mounted area is reducible by TSOP23-6. ・Input voltage range : 2.5V - 5.5V ・Boost converter Maximum output voltage : 38V Switching frequency range : 1MHz ・LED driver feedback Voltage THL6521 : 100mV THL6523 : 300mV ・PWM dimming frequency : 100Hz - 200kHz ・Protection Soft start Over current protection Under voltage lock out protection Over voltage protection Thermal shut down ・TSOT23-6 package Application ･Mobile phone display backlight ・Car Navigator display backlight ･Laptop / Netbook / Tablet PC display backlight Pin Configuration Block Diagram VIN LX 1 6 VCC GND 2 5 NC FB 3 4 PWM/EN LX VCC PWM/EN UVLO OVP Boost FB SS OSC GND Copyright© 2015 THine Electronics, Inc. All rights reserved. 1/8 THine Electronics, Inc. THL6521 / THL6523_Rev.1.01_E Absolute Maximum Ratings Parameter Symbol VCC VH VL Pd Tj Tstg VCC voltage LX voltage FB / PWM/EN voltage Power description Junction temperature *1 Storage temperature range Rating 6 43 6 0.4 -40 to +125 -55 to +150 Units V V V W ℃ ℃ *1. The operating temperature range should perform a thermal design, after consulting the thermal characteristic. Please use it in the range which does not exceed junction temperature. Recommended Operating Conditions Parameter Min 2.5 0.1 VCC voltage LX voltage PWM dimming frequency Typ - Max 5.5 38 200 Units V V kHz Pin Description Number Name 1 LX 2 3 GND FB 4 PWM/EN 5 6 NC VCC Function Boost converter switching output pin Ground pin Feedback input pin PWM dimming control input pin / Enable pin Non connection pin Input supply voltage pin Description This pin is switching output of boost converter. Ground of LED driver. LED current is set by the value of the external resistor. This pin is PWM dimming control and Enable. If a High level is impressed, the LED driver operate. If A Low level inputted 20msec or more, it operates as enabling. IC stops after that. This pin is non connection pin. Please open. Power supply pin. Copyright© 2015 THine Electronics, Inc. All rights reserved. 2/8 THine Electronics, Inc. THL6521 / THL6523_Rev.1.01_E Power Dissipation 450 Power Dissipation [mW] 400 350 300 250 200 150 100 50 0 -40 -20 0 20 40 60 80 100 120 140 Operating Temperature [℃] Copyright© 2015 THine Electronics, Inc. All rights reserved. 3/8 THine Electronics, Inc. THL6521 / THL6523_Rev.1.01_E Electrical Characteristics Parameter （at VCC＝3.3V , Ta=25℃, unless otherwise noted） Symbol Test Conditions Min Typ Max Units Input quiescent Current 1 Icc1 Vfb=0V - 1 2 mA Input quiescent Current 2 Icc2 Vfb=1.5V - 400 600 uA - - 4 uA Standby current Ist UVLO threshold voltage Vuvlo - 2.2 - V UVLO hysteresis voltage dVuvloh - 100 - mV PWM/EN input high voltage Vpwm_h 1.4 - - V PWM/EN input low voltage Vpwm_l - - 0.5 V Ipwm_leak - 1 - uA PWM/EN sink current PWM/EN dimming frequency PWM/EN minimum pulse PWM/EN Low shoutdown delay time Boost converter switching frequency Boost converter Maximum duty cycle Soft start time FB voltage Fpwm VCC rising 0.1 - 200 kHz Tmin_pulse - 1 - us Tpwm_sd - 20 - ms Fosc - 1 - MHz 90 - - % - 5 - ms 90 100 110 285 300 315 Vfb=0.1V - -300 - - 0.5 - Ω Vlx=10V - 10 - uA Dmax Duty=5%～100% Vfb=0V Tss THL6521 THL6523 FB input bias current Vfb Ifb LX ON-resistance Ron LX leakage current Ilx_leak mV nA Over current threshold Iocp 1.2 1.5 - A Over voltage protection threshold Vovp 38 39 - V Copyright© 2015 THine Electronics, Inc. All rights reserved. 4/8 THine Electronics, Inc. THL6521 / THL6523_Rev.1.01_E Function PWM dimming / Enable Input voltage / Output voltage The dimming function is carried. It is possible to control If the difference of input voltage and output voltage ON/OFF of the constant current output for LED by becomes large, the ON Duty cycle (Don) will become inputting in a PWM signal. An LED output becomes small. Depending on the conditions of input and output active when a PWM signal is a High level. Please input a voltage, the pulse width below the minimum pulse width, dimming signal in 200 kHz from 100 Hz. The minimum 250nsec is needed. In this case, a pulse is skipped and Duty cycle DPWMmin which can be set up by a PWM frequency is decreased. Please decide the input and dimming function is determined by the following output voltage condition with considering a maximum formula from PWM minimum pulse width and the Duty cycle and the minimum pulse width. frequency fPWM of PWM. <<Notes>> This product contains the over circuit in order to protect DPWM min [%] 1[ sec] f PWM [ MHz ] 100 current protection destruction of IC from the When not use a dimming function, please input the output abnormality of a boost converter. Please refer to Over current protection (OCP) for details. signal of a high level to PWM terminal. If a dimming After a signal which is less than 100Hz is inputted, a boost power supply is inputted, the voltage difference of input converter is stopped and it performs the same operation voltage and output voltage becomes the largest at the as EN. PWM does not have restriction of an input moment of Under voltage lock out (UVLO) being sequence. If inputted into PWM before the input of VCC, canceled. there is no problem. In this condition, most much current flows from an input. If you do not use a dimming function, please use it as EN. When input voltage is inputted slowly, the over-current The standby function is carried. When EN input terminal protection circuit is operated for the above-mentioned is made into a low level 20msec or more, it will be in a reason. In that case, please input into VCC after inputting standby state. EN input or PWM input. In inputting into VCC, please And a boost converter and an LED drive output are suspended. The consumed current is set to less use the conditions that it does not become an than 4uA in a standby state. EN does not have restriction over-current. of an input sequence. If inputted into EN before the input of VCC, there is no problem. Boost converter The boost converter for an LED drive is built in. The LED Constant current output setup voltage of an LED constant current output OUT terminal LED current is determined by resistance connected to is feedback, and the suitable voltage for the anode of between FB terminal and GND. Please use it according LED is supplied. to the following formula from feedback voltage. Copyright© 2015 THine Electronics, Inc. All rights reserved. 5/8 THine Electronics, Inc. THL6521 / THL6523_Rev.1.01_E ・ THL6521 : VFB=100mV overshooting and rush current occur when input voltage ・ THL6523 : VFB=300mV is inputted. I LED VFB RFB Over Voltage protection (OVP) Over voltage protection is built in. If LED is disconnecting, the output voltage of a boost converter is 100 stopped and destruction of IC is prevented. FB pin RFB Over current protection (OCP) Fig. 1 In order to restrict the over-current by the abnormalities Filter setup of FB input of load, etc., the over-current protection circuit is built in. <<Notes>> Over-current detection of pulse-by-pulse system is Over voltage is added to FB terminal when LED is adopted. An output transistor is turned off if the current short-circuited. It which flows into an output transistor reaches boost recommends inserting the resistance (Fig. 1) of 100ohm converter limit current (Iocp). The output transistor in a FB terminal for fracture prevention. operates again in reset time in IC after that. An IC may be destroyed by it. over-current protection circuit detects the peak current of an inductor. Input-and-output voltage and not only LED Protection circuits constant current but ripple current is taken into Under voltage lock out (UVLO) consideration. The UVLO function is carried in order to prevent malfunction in the state where input voltage is low. A boost converter and an LED constant current output are Thermal shut down (TSD) suspended to the power supply voltage which can carry In order to prevent destruction by heat, the thermal out operational stability. UVLO is released by more than shutdown circuit is built in. If the junction temperature 2.2V input voltage. And a boost converter carries out Tj is 125oC or more, the thermal shutdown circuit will LEDs constant current drive, after starting soft start operate and it will stop switching operation. Moreover, operation. the hysteresis of a thermal shutdown circuit is 20 oC. If Tj falls, output voltage will return. Soft start (SS) The boost converter carries the soft start function in order to prevent the rush current at a start-up. This function is to raise output voltage slowly. It is because Copyright© 2015 THine Electronics, Inc. All rights reserved. 6/8 THine Electronics, Inc. THL6521 / THL6523_Rev.1.01_E Package Dimensions TSOP23-6 Copyright© 2015 THine Electronics, Inc. All rights reserved. 7/8 THine Electronics, Inc. THL6521 / THL6523_Rev.1.01_E Notices and Requests 1. The product specifications described in this material are subject to change without prior notice. 2. The circuit diagrams described in this material are examples of the application which may not always apply to the customer’s design. We are not responsible for possible errors and omissions in this material. Please note if errors or omissions should be found in this material, we may not be able to correct them immediately. 3. This material contains our copyright, know-how or other proprietary. Copying or disclosing to third parties the contents of this material without our prior permission is prohibited. 4. Note that if infringement of any third party's industrial ownership should occur by using this product, we will be exempted from the responsibility unless it directly relates to the production process or functions of the product. 5. This product is presumed to be used for general electric equipment, not for the applications which require very high reliability (including medical equipment directly concerning people's life, aerospace equipment, or nuclear control equipment). Also, when using this product for the equipment concerned with the control and safety of the transportation means, the traffic signal equipment, or various Types of safety equipment, please do it after applying appropriate measures to the product. 6. Despite our utmost efforts to improve the quality and reliability of the product, faults will occur with a certain small probability, which is inevitable to a semi-conductor product. Therefore, you are encouraged to have sufficiently redundant or error preventive design applied to the use of the product so as not to have our product cause any social or public damage. 7. Please note that this product is not designed to be radiation-proof. 8. Customers are asked, if required, to judge by themselves if this product falls under the category of strategic goods under the Foreign Exchange and Foreign Trade Control Law. 9. The product or peripheral parts may be damaged by a surge in voltage over the absolute maximum ratings or malfunction, if pins of the product are shorted by such as foreign substance. The damageｓ may cause a smoking and ignition. Therefore, you are encouraged to implement safety measures by adding protection devices, such as fuses. THine Electronics, Inc. [email protected] Copyright© 2015 THine Electronics, Inc. All rights reserved. 8/8 THine Electronics, Inc.