DP _01. Discrete Semiconductor Division. LED Driver IC. TOSHIBA Semiconductor Company Sep

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1 1 LED Driver IC 2004 Sep TOSHIBA Semiconductor Company Discrete Semiconductor Division 1

2 2 New!! Non up-convert type constant current driver [CC-Driver] New concept and high efficiency white LED driver IC for LCD backlight 2

3 3 LED driver products chart Toshiba LED driver IC series have many line-up Step-up DC/DC converter type Charge-pump type Toshiba LED driver IC Non up-convert type CC-Driver This material include non up-convert type only. If you need DC/DC converter type information, please contact Toshiba. 3

4 LED driver products line-up BU X87 X34 Product Name TB62736FUG TB62735FxG TAH8N401K TAH6N201U Function Sw type Step up Dc/DC converter Charge Pump type Step up Dc/DC Converter Non Step up Type LED Connection Series Parallel Parallel Parallel Current Dribability 30mA 30mA 25mA Number of Channel 1ch(6LED Seies) 4ch (parallel) 4ch 2ch Example of Application Circuit Features Notes Recommendable Set Compatible with LT1937 (LT) Compatible with SC604 (Semtech) Compatible with MAX1573 (Maxim) High Accuracy of Output Current Low Noise High Efficiency(87%)(As System Efficiency) High Efficiency(80%)(As System Efficiency) Save the round Space(9mm2) Save the round Space(16mm2) Low profile Package(1.2mmMAX) Low profile Package(1.0mmMAX) EMI Noise - In case of require High Efficiency In case of care of Noise issue In case of High Drive Capability (i.e. Flash Light application etc.) Reduce the external Parts Extremely Low noise High Efficiency(92%)(As system Efficiency) Save the round Space(4ch:6mm2,2ch:4.6mm2) Low profile Package(4ch:0.8mmMAX,2ch:0.75mmMAX) Input In case of use Li-ion 1Cell (Limitation of Iuput Voltage and Output Current) Input Voltage In case fo require Low Profile In case of prioritize Battery Efficiency 4 4

5 Benefit of Non up-convert type LED driver Non up-convert type LED driver example Circuit parts count and Mounting area size Need only one resistor for current setup One TAH8N401K 8mm 2 One resistor 1mm 2 Total 9mm 2 Mounted with white LED on same flexible board No need more area on cellular phone side Operation losses are supply current and output saturation. In case of VCC = 3.6V, total efficiency is over 90% 5 5

6 Application circuit of Non up-convert LED driver White LED drive circuit TAH8N401K(4ch Driver) TAH6N201U(2ch Driver) Power Supply CONTROL Power Supply CONTROL VCC VCC DRIVE (2) Control Signal High level: ON Low level: OFF REF GND DRIVE (1) REF GND Simple circuit Space saving More detail on our latest datasheet. Be careful to over power quicient. 6 6

7 Application circuit with step luminosity control Step luminosity control application Power Supply CONTROL Truth table for step control circuit Cont-A Cont-B Setting resistance VCC L L L H H L Resistor-A+B+C Resistor-A+C Resistor-B+C H H Resistor-C Resistor-A CONTROL-A Resistor-B CONTROL-B REF GND Resistor-C SSM6N16FE is suitable Package size is 1.6 x 1.6 x 0.55mm 7 7

8 Application circuit with linear luminosity control (1) Linear control with PWM generator Recommendation circuit with CMOS MCU output Power Supply CONTROL MCU / APU VCC PWM signal REF GND In case of using CMOS output driver, apply PWM signal to a control terminal. Operation chart Resistor Shutdown Full current Linear control 0% Duty 100% 8 8

9 Application circuit with linear luminosity control (2) Linear control with PWM generator Recommendation circuit with Open drain CPU output Power Supply CONTROL VCC Operation chart Shutdown Full current Linear control 0% Duty 100% MCU / APU REF GND PWM signal Resistor In case of using Open drain output driver, apply PWM signal to resistor. 9 9

10 Application circuit with linear luminosity control (3) Engineering Information of linear luminosity control with PWM Recommended signal frequency is between 1kHz to 100kHz Under 1kHz : LEDs begins to flicker. Resistor MOS-FET drive PWM signal Stable operating area <Condition> Resistor=7.2kΏ Drive current=16ma Duty=100% Duty=80% Duty=50% Duty=20% Frequency(kHz) Over 100kHz : LEDs can t be control Luminosity control can be changed by duty cycle of the PWM [ Average drive current => Drive current X Duty ratio ] Drive current t T Duty cycle=t/tx100 (%) Frequency=1/T (Hz) Average drive current(ma) 10 10

11 11 Vcc SW1 Vref SW2 SW3 MODE1: 1basic application circuit 2Linear luminosity control Vref LED4 LED3 LED2 LED1 CC-Driver evaluation board circuit Ver.3 1 PWM signal input 2 6.8kΩ 1 2 TAH8N401K (4ch Driver) Control Signal Input 2 1 Gnd Input A Input B SSM6N16FE Gnd TAH6N201U (2ch Driver) 5.6kΩ 18kΩ 6.8kΩ 1 2 SW4 MODE2: Step luminosity control 11

12 3 or 4ch drive type CC-Driver product line-up(1) TAH8N401K New!! E/S: OK M/P: OK Major Max. ratings Item Input Voltage Drive current Power Dissipation *1: 4ch Total *2: Mounted on 30mm x 30mm Glass-Epoxy Board Rating 7V 100mA *1 400mW *2 Recommended operating condition Supply Voltage Drive current *3: 4ch Total Item Condition 2.5 ~ 4.5V 80mA *3 Package and Pin assignment US mm 3.1mm Major Electrical Characteristics (Ta= 25 C) Item Supply Current Current Difference REF Voltage Condition I DRIVE = 80mA Ch(MAX) Ch(MIN) Unit ma ma If you need more detail, Please see our latest datasheet. V MIN TYP MAX mm t = 0.8mm MAX 1: DRIVE(2) 2: DRIVE(1) 3: REF 4: GND 5: VCC 6: CONTROL 7: DRIVE(4) 8: DRIVE(3) 12 12

13 1 or 2ch drive type CC-Driver product line-up(2) TAH6N201U New!! E/S: OK M/P: OK Major Max. ratings Item Input Voltage Drive current Power Dissipation Rating 7V 50mA *4 200mW *5 Package and Pin assignment 6 5 UF mm 2.1mm *4: 2ch Total *5: Mounted on 1inch 2 Glass-Epoxy Board. Pad area size is 216mm 2 Recommended operating condition Supply Voltage Drive current *6: 2ch Total Item Condition 2.5 ~ 4.5V 40mA *6 Major Electrical Characteristics (Ta= 25 C) Item Supply Current Current Difference REF Voltage Condition I DRIVE = 40mA Ch(MAX) Ch(MIN) Unit ma ma If you need more detail, Please see our latest datasheet. V MIN TYP MAX : REF 2: GND 3: DRIVE(1) mm t = 0.75mm MAX 4: DRIVE(2) 5: VCC 6: CONTROL 13 13

14 The information contained herein is subject to change without notice. The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of TOSHIBA or others. TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the Handling Guide for Semiconductor Devices, or TOSHIBA Semiconductor Reliability Handbook etc. The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ( Unintended Usage ). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer's own risk. TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced and sold, under any law and regulations

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