MEL7136BM5G

MEL7136A/MEL7136B Linear Adjustable Constant Current LED Driver MEL7136A/MEL7136B General Description Features The MEL7136A is a constant current regulator for driving LEDs with low quiescent current and low dropout voltage. The current is adjustable from 10mA to1A with an external resistor. The MEL7136B is only a controller , and must be connected to an external NMOS. MEL7136B is an external transistor, is suitable for applications requiring a high output current . The output current of ME7136B can be adjusted by external DC control voltage or PWM control. Only one external resistor is required to achieve a constant current LED driver. Soft start , thermal protection and low voltage protection are also provided. The driver pin EXT is provided for current and voltage extension. Adding an external NMOS or NPN transistor to this pin can extend current and voltage range.  Selection Guide Typical Application            MEL7136B is only a controller , and must be connected to an external NMOS. The output current of ME7136B is adjustable Sink current:10mA to1A adjustable with an external resistor Current and voltage range extendable by adding an external NMOS or NPN transistor Power supply voltage: 2.7-18V Low drop out voltage: 50mV@1A Low quiescent current: 80uA Thermal Shutdown protection：165℃ Soft start Low voltage protection: 2.5V Package: MEL7136A: SOT89-5, ESOP8 MEL7136B: SOT23-5 Power Led driver and controller Typical Application Circuit V05 www.microne.com.cn Page 1 of 14 MEL7136A/MEL7136B MEL7136A Low Voltage And Light Load (Under 1A) Low Voltage And Heavy Load (Exceed 1A) High Voltage Application MEL7136B Low Voltage Application High Voltage Application VDD 2.7V-18V VDD VDD Zener Diode CIN 10uF MEL7136B EXT CIN 10uF GND V05 VDD NMOS MEL7136B EXT CS REXT www.microne.com.cn GND NMOS CS REXT Page 2 of 14 MEL7136A/MEL7136B Adjustable Output Current Application VDD VDD CIN 10uF MEL7136B EXT NMOS R3=10K GND CS R4=240K REXT=1Ω Dimming VDC/PWM REXT Resistor Value selection: REXT(Ω ) ILED(mA) 10 10 1 100 0.286 350 0.1 1000 ILED  V R CS EXT Block Diagram MEL7136A V05 MEL7136B www.microne.com.cn Page 3 of 14 MEL7136A/MEL7136B Pin Configuration SOT23-5(only for MEL7136B) SOT89-5 ESOP8 Pin Assignment MEL7136A Pin Number Pin Name Functions 1 CS Output current detection 1 2 D(LED) The negative input feet of LED 3 3 VDD Power Input 5 4 GND Ground 7 5 EXT Driving external NMOS NC No connection ESOP8 SOT89-5 2 4,6,8 MEL7136B Pin Number Pin Name Functions 1 NC NC 2 GND Ground 3 VDD Power Input 4 CS Output current detection 5 EXT Driving external NMOS SOT23-5 Absolute Maximum Ratings Parameter Symbol Ratings Units Input Voltage VDD 18 V Voltage on LED,CS VLED, VCS, -0.3～VDD+0.3 V Voltage on EXT VEXT 6 V Output Current IOUT 1.5 A Power Dissipation V05 SOT89-5 PD www.microne.com.cn 500 1300（PCB mounted）（*1） mW Page 4 of 14 MEL7136A/MEL7136B 2000 ESOP8 PD SOT23-5 PD 300 Operating Temperature Range TOPR －40～＋125 ℃ Storage Temperature Range TSTG －40～＋150 ℃ 2000（PCB mounted）（*1） mW (T=25℃) 260℃，4sec Lead Temperature ESD(ESD voltage for human body model ) VESD 2000 V *1:The power dissipation figure shown in PCB mounted. Please refer to page8-9 for details. Electrical Characteristics MEL7136A/MEL7136B (VDD= 3.6V, Ta=25OC, unless otherwise noted) Parameter Symbol Conditions Min. Sink Current I sink VDD=3.6V Input Voltage VDD I sink=1A CS Voltage VCS Sink current accuracy △ILED/ILED Load Regulation LDR Line Regulation LNR Output dropout voltage V drop Quiescent Current ISS I sink=1A Units 10 1000 mA 2.7 18 V mV 95 100 105 -5 -2.5 5 % 0.1 2 mA/V 0.4 2 mA/V 50 100 mV 80 100 uA 2.5 2.7 V VLED= 3V 3.6V≤VDD≤18V VDD=3.6V, VLED= 0.5V VDD=3.6V 2.3 Low voltage hysteresis Vhys Maximal EXT Voltage VEXT Thermal Shutdown protection Tsd V05 Max. VLED=0.2V to 3V VDD=3.6V Low Voltage Protection Typ. 0.15 VDD=5.0V,VCS=0V 2.5 3.6 V 4.5 ℃ 165 www.microne.com.cn V Page 5 of 14 MEL7136A/MEL7136B Type Characteristics （1） Quiescent Current VS. Input Voltage （No external component） Quiescent Current VS. Input Voltage Quiescent Current(uA) 120 100 80 60 40 20 0 0 2 4 6 8 10 12 14 16 18 Input Voltage(V) （2） Quiescent Current VS. Temperature（VDD=3.6V ） Quiescent Current VS.Temperature Quiescent Current(uA) 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 120 140 160 900 1000 Temperature(℃) （3） Dropout Voltage VS. Output Current（VDD=3.6V ） Dropout Voltage VS. Output current Dropout Voltage (mV) 60 50 40 30 20 10 0 0 100 200 300 400 500 600 700 800 Output current(mA) V05 www.microne.com.cn Page 6 of 14 MEL7136A/MEL7136B Adjustment of the ME7136B output current 1 Output current adjustment by external DC control voltage The Dimming pin can be driven by an external dc voltage (VDC), as shown, to adjust the output current to a value below the nominal average value defined by REXT. VREF=0.1V. VDD MEL7136B R3=10K CS R4=240K REXT=1 Dimming VDC : 0-2.5V Figure 1. Dimming Control Using a DC Voltage R4:R3=24:1 The average output current is given by: ILED  V REF ILED  0  R3  (V V ) DC REF R4 REXT （0≤VDC≤2.5V） (2.5≤VDC≤VDD） 2 Output current adjustment by PWM control A Pulse Width Modulated (PWM) signal with duty cycle PWM can be applied to the Dimming pin, as shown below, to adjust the output current to a value below the nominal average value set by resistor REXT.VREF=0.1V. V05 www.microne.com.cn Page 7 of 14 MEL7136A/MEL7136B VDD MEL7136B R3=10K CS R4=240K REXT=1 Dimming VH≥2.5V PWM F=100-1000HZ 0 Figure 2. Dimming Control Using a PWM Signal R4:R3=24:1 The average output current is given by: ILED  V REF  R3  (2.5  Duty  V REF ) R4 REXT (2.5≤VPWM≤VDD & 0≤Duty≤100%) PWM dimming provides reduced brightness by modulating the LED’s forward current between 0% and 100%. The LED brightness is controlled by adjusting the relative ratios of the on time to the off time. A 25% brightness level is achieved by turning the LED on at full current for 25% of one cycle. To ensure this switching process between on and off state is invisible by human eyes, the switching frequency must be greater than 100 Hz. Above 100 Hz, the human eyes average the on and off times, seeing only an effective brightness that is proportional to the LED’s on-time duty cycle. The advantage of PWM dimming is that the forward current is always constant, therefore the LED color does not vary with brightness as it does with analog dimming. Pulsing the current provides precise brightness control while preserving the color purity. The best dimming frequency of MEL7136B is 100Hz to 1kHz. V05 www.microne.com.cn Page 8 of 14 MEL7136A/MEL7136B Power dissipation ● SOT89-5 power dissipation The power dissipation data for the SOT89-5 is shown as below. The value of power dissipation varies with the mount board conditions. Please use this data as the reference data taken in the following condions. 1. Measurement condition Condition: Mount on a board Ambient: Natural convection Soldering: Lead(pb) free Board: Dimensions 30*35mm (1050mm2 in one side) Copper(Cu) traces occupy 50% of the board Area in top and back faces Material: Glass Epoxy (FR-4) Thickness: 1.6mm Through-hole: 5*0.8 Diameter 2. Power dissipation vs. Ambient temperature Board Mount (Tj max=125 ℃) Evaluation Board( Unit:mm) Ambient Temperature(℃) Power Dissipation(mW) 25 1300 85 520 Thermal Resistance(℃/W) 76.92 Pd vs.Ta 1400 Power dissipation (mW) 1200 1000 800 600 400 200 0 25 35 45 55 65 75 85 95 105 115 125 Ambient temperature(℃) V05 www.microne.com.cn Page 9 of 14 MEL7136A/MEL7136B ● ESOP8 power dissipation The power dissipation data for the ESOP8 is shown as below. The value of power dissipation varies with the mount board conditions. Please use this data as the reference data taken in the following condions. 3. Measurement condition Condition: Mount on a board Ambient: Natural convection Soldering: Lead(pb) free Board: Dimensions 30*35mm (1050mm2 in one side) Copper(Cu) traces occupy 50% of the board Area in top and back faces Material: Glass Epoxy (FR-4) Thickness: 1.6mm Through-hole: 4*0.8 Diameter 4. Power dissipation vs. Ambient temperature Board Mount (Tj max=125 ℃) Evaluation Board( Unit:mm) Ambient Temperature(℃) Power Dissipation(mW) 25 2000 85 700 Thermal Resistance(℃/W) 66.67 Pd vs.Ta Power dissipation(mW) 2400 2000 1600 1200 800 400 0 25 35 45 55 65 75 85 95 105 115 125 Ambient temperature(℃) V05 www.microne.com.cn Page 10 of 14 MEL7136A/MEL7136B Packaging Information ● Packaging Type: SOT89-5 Millimeters Inches DIM Min Max Min Max A 4.4 4.6 0.173 0.181 a 0.5 0.62 0.02 0.024 B 1.63 1.83 0.064 0.072 b 0.44 0.54 0.017 0.021 C Type:0.059 D 2.4 2.6 0.094 0.102 E 1.4 1.6 0.054 0.063 F 0.35 0.43 0.013 0.017 L 3.95 4.25 0.155 0.167 r V05 Type:1.5 Type:80 www.microne.com.cn Type:80 Page 11 of 14 MEL7136A/MEL7136B ● Packaging Type: SOP8-PP Dimension (mm) Dimension (Inches) Character Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.1 0.3 0.004 0.012 B b V05 1.27(Typ.) 0.330 0.05(Typ.) 0.510 0.013 0.020 c 0.9(Typ.) 0.035(Typ.) c1 1.0(Typ.) 0.039(Typ.) D 5.8 6.2 0.228 0.244 D1 3.202 3.402 0.126 0.134 E 3.800 4.000 0.150 0.157 E1 2.313 2.513 0.091 0.099 F 4.7 5.1 0.185 0.201 L 0.675 0.725 0.027 0.029 G 0.32(Typ.) 0.013(Typ.) R 0.15(Typ.) 0.006(Typ.) 1 7  8 ° ° www.microne.com.cn ° 7 ° 8 Page 12 of 14 MEL7136A/MEL7136B Package type:SOT23-5 Unit:mm(inch) Millimeters Inches DIM V05 Min Max Min Max A 0.9 1.45 0.0354 0.0570 A1 0 0.15 0 0.0059 A2 0.9 1.3 0.0354 0.0511 B 0.2 0.5 0.0078 0.0196 C 0.09 0.26 0.0035 0.0102 D 2.7 3.10 0.1062 0.1220 E 2.2 3.2 0.0866 0.1181 E1 1.30 1.80 0.0511 0.0708 e 0.95REF 0.0374REF e1 1.90REF 0.0748REF L 0.10 0.60 0.0039 0.0236 a0 00 300 00 300 www.microne.com.cn Page 13 of 14 MEL7136A/MEL7136B      V05 The information described herein is subject to change without notice. Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Nanjing Micro One Electronics Inc is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro One Electronics Inc. Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. www.microne.com.cn Page 14 of 14