AS3110 1.5A High Power LED Driver FEATURES GENERAL DESCRIPTION Only 5 external components required AS3110 is a PWM power LED driver IC. The driving Output switch current up to 1.6A current from few milliamps up to 1.5A. It allows high 4V~40V wide operation voltage range brightness power LED operating at high efficiency High efficiency from 4Vdc to 40Vdc. Up to 200KHz external ESD protection HBM 2KV controlled operation frequency. External resistor TO252-5L pin power packages controlled the maximum output current to single LED or a LED string. APPLICATIONS DC/DC LED Driver Automotive Lighting High Power LED Driver TYPICAL APPLICATION Rsense 4V to 40V 1 VCC 5 Cin Ct AS3110 Rev.1.3 6/25/2008 CT 2 IS AS3110 4 OUT L Df GND 3 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 1 EV3110-r1.0 1.6A High Power LED Driver FEATURES GENERAL DESCRIPTION Only 5 external components required AS3110 is a PWM power LED driver IC. The driving Output switch current up to 1.6A current from few milliamps up to 1.5A. It allows high 4V~40V wide operation voltage range brightness power LED operating at high efficiency High efficiency from 4Vdc to 40Vdc. Up to 200KHz external ESD protection HBM 2KV controlled operation frequency. External resistor TO252-5L pin power packages controlled the maximum output current to single LED or a LED string. APPLICATIONS DC/DC LED Driver Automotive Lighting High Power LED Driver TYPICAL APPLICATION Rsense 4V to 40V 1 VCC 5 Cin Ct EV3110 Rev.10 6/25/2008 CT 2 IS AS3110 4 OUT L Df GND 3 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 1 AS3110 1.5A High Power LED Driver ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note1) Input Voltage……………..………… -0.3V to 40V Output Voltage ….………………..…-0.3V to 40V Junction Temperature……………..…... ….150℃ Junction Temperature……………..…….….150℃ Operation Temperature Range ..... -40℃ to 85℃ Lead Temperature(Soldering, 10sec.) ……260℃ Top View ORDER PART NUMBER AS3110EST PART MARKING TO252-5L Plastic Package AS3110 TJMAX=150℃(Note2) Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: T is calculated from the ambient temperature T and power dissipation P according to the following formula: J A D T = TA + PD x Ө . J JA RECOMMAND OPERATION CONDITIONS PARAMETER MIN Supply Voltage 4 TYP MAX UNITS 40 V 1.6 A 85 ℃ MAX UNITS 4 mA 1 1.3 V 0.01 10 uA 300 330 mV Output Switching Current Operation Temperature -40 ELECTRICAL CHARACTERISTICS VIN =5V, TA = 25°C, unless otherwise noted. PARAMETER CONDITIONS Supply Current Vcc=4V~40V Output Dropout Voltage IOUT=1A, VIS-VOUT Output Leakage Current VIS-VOUT=40V Current Sense Voltage VCC-VIS Maximum duty cycle VIS=VCC MIN TYP 270 CT Charge Current 85 % 35 μA Power Dissipation Note3 PACKAGE TO252-5L θJA DERATING FACTOR POWER RATING POWER RATING POWER RATING (℃/W) (mW/℃) TA≥25℃ (mW) TA≤25℃ (mW) TA=70℃ (mW) TA=85℃ 12.5 1560 1000 820 80 Note3: Junction Temperature Calculation: TJ=TA+(PD×θJA). PD: Power Dissipation, TA: Ambient temperature, θJA: Thermal Resistance-Junction to Ambient The θJA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no ambient airflow. AS3110 Rev.1.3 6/25/2008 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 2 AS3110 1.5A High Power LED Driver PIN FUNCTIONS PIN NUMBER PIN NAME FUNCTION 1 VCC Input Voltage 4V ~ 40V 2 IS Peak Current Senses Pin 3 GND Ground 4 OUT Driver Output Pin 5 CT Oscillator Timing Capacitor BLOCK DIAGRAM AS3110 Rev.1.3 6/25/2008 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 3 AS3110 1.5A High Power LED Driver APPLICATION INFORMATION Low Voltage DC/DC Application The AS3110 was designed for power LED driving application. Only 5 external components were required for low voltage application. Fig.1 shows the typical application circuit for input voltage range from 4V to 40V. Buck power conversion topology was used and total forward voltage (at expecting current) of the LED string should lower than supply voltage by 1.6V at least. The Rsense value should higher than 200mΩ so that driving current won’t over the recommended maximum driving current 1.5A. Inductor The Inductor L stores energy during switch turn-on period and discharge driving current to LEDs via flywheel diode while switch turn-off. In order to reduce the current ripple on LEDs, the L value should high enough to keep the system working at continuous-conduction mode that inductor current won’t fall to zero. Since in steady-state operation the waveform must repeat from one time period to the next, the integral of the inductor voltage v over one time L period must be zero: Input Bypass Capacitor The input by-pass capacitor C IN holds the input voltage and filters out the switching noise of Therefore AS3110. Flywheel Diode The fast recovery diode was recommended for flywheel diode D . This is because the high F reverse recovery current will cause the voltage drop across Rsense being higher than 300mV, and consequently the switch will be turned off which has just been turned on. LED Driving Current The peak current I PK flow though LEDs was decided by: The average current on LEDs was determined by the peak-to-peak ripple current that was decided by inductor L. Assume the target average current Where, V LED is the total forward voltage (at expecting current) of the LED string, V is the F forward voltage of the flywheel diode D V F, Rsense is the peak value of the voltage drop across Rsense which is 300mV, and V is the saturation voltage SAT of the switch which has a typical value of 1V. Since the operation frequency f is determined by choosing appropriate value for timing capacitor C , T the switch turn-on time can also be known by With knowledge of the peak switch current and switch on time, the value of inductance can be calculated. 550mA on LEDs and ripple current 100mA then the Rsense should be: AS3110 Rev.1.3 6/25/2008 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 4 AS3110 1.5A High Power LED Driver TYPICAL PERFORMANCE CHARACTERISTICS 0.75 8V to 32V 1 VCC 5 100uF 820pF CT 2 IS AS3110 4 OUT 220uH SF 1W GND 3 Figure1. Application circuit for 1W LED Driver AS3110 Rev.1.3 6/25/2008 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 5 AS3110 1.5A High Power LED Driver TYPICAL PERFORMANCE CHARACTERISTICS Figure1. Application circuit for 3*1W AS3110 Rev.1.3 6/25/2008 LED Driver www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 6 AS3110 1.5A High Power LED Driver PACKAGE DESCRIPTION Units: mm Package 5-Lead Plastic TO252-5L 2.2~2.4 6.35~6.65 5.2~5.4 1.27 2.55~2.9 0.127max. 5.4~5.7 9.5~9.9 0.43~0.58 0.4~0.6 0.43~0.58 3.8REF ~1.78 2.54REF AS3110 Rev.1.3 6/25/2008 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 7 AS3110 1.5A High Power LED Driver © ANISEM Semiconductor Co., Ltd ANISEM assume responsibility for use of any circuitry other than circuitry entirely embodied in an ANISEM product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. ANISEM reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. ANISEM warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ANISEM’s standard warranty. Testing and other quality control techniques are utilized to the extent ANISEM deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AS3110 Rev.1.3 6/25/2008 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 8 EV3110-r1.0 1.6A High Power LED Driver FEATURES GENERAL DESCRIPTION Only 5 external components required AS3110 is a PWM power LED driver IC. The driving Output switch current up to 1.6A current from few milliamps up to 1.5A. It allows high 4V~40V wide operation voltage range brightness power LED operating at high efficiency High efficiency from 4Vdc to 40Vdc. Up to 200KHz external ESD protection HBM 2KV controlled operation frequency. External resistor TO252-5L pin power packages controlled the maximum output current to single LED or a LED string. APPLICATIONS DC/DC LED Driver Automotive Lighting High Power LED Driver TYPICAL APPLICATION Rsense 4V to 40V 1 VCC 5 Cin Ct EV3110 Rev.10 6/25/2008 CT 2 IS AS3110 4 OUT L Df GND 3 www.anisem.com ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 ANISEM All Rights Reserved. 1