mlx10803 Melexis Company, mlx10803 Datasheet
mlx10803
Available stocks
Related parts for mlx10803
mlx10803 Summary of contents
Page 1
... Part Nr MLX10803 General Description The MLX10803 is a multi-purpose LED driver for high power LEDs designed for high current and high voltage applications. The circuit is designed for demanding automotive applications and therefore suitable in all other high intensity LED applications. Numerous adjustment possibilities allow for the design of different LED applications using only a few external components ...
Page 2
... General.....................................................................................16 7.2. The principle in detail................................................................17 7.3. Switching frequency considerations and constant light output .20 8. Temperature regulation ...................................................................21 9. Mechanical Data ..............................................................................22 9.1. Mechanical data of the MLX10803 package ............................22 10. Standard information regarding manufacturability of Melexis products with different soldering processes.....................................23 11. History record ..................................................................................24 12. Disclaimer........................................................................................25 3901010803 Rev 025 ...
Page 3
... GND 3901010803 Rev 025 IC specification VDD Power on Reset Debouncing 300 ns COMP divider 1/5 Start ON divider 1/10 COMP OFF FF ON Page 3/25 MLX10803 High power LED driver POR RSENSE COMP 4V IREF2 4V Minimal voltage selection VREF VS/PWM 20mV Clamping max DRVGATE Data Sheet 2/OCT/07 IREF1 ...
Page 4
... GND Figure 2: Minimum application without temperature and external EMC protection 3901010803 Rev 025 IC specification VS/PWM VREF DRVGATE ROSC Cnoise GND IREF1 RSENSE IREF2 NTC VS/PWM VREF DRVGATE ROSC GND IREF1 RSENSE IREF2 Page 4/25 MLX10803 High power LED driver Data Sheet 2/OCT/07 ...
Page 5
... Application with gradual increase of light intensity after power up (soft start) 1.1.4. LED driver application notes The MLX10803 is optimised for the use of low cost coils and n-channel MOSFETs. For a standard application with 1 LED and an average current of 350mA, a coil of about 100µH…220µH and ≤ resistance should be chosen. The sense resistor should have a value between 0.27 … ...
Page 6
... The minimum schematic diagram under Figure 2 is sufficient for all applications with a constant light output. We also recommend to compare with our other circuits in the MLX108xx family and study these application notes for suitable solutions. 3901010803 Rev 025 IC specification High power LED driver Page 6/25 MLX10803 Data Sheet 2/OCT/07 ...
Page 7
... Tjunc normal operation. max. 100h Tambient normal operation rth SOIC8 Page 7/25 MLX10803 High power LED driver Min Max Unit - -0 -80 ...
Page 8
... With 6V vs > vporh analogue parameters can not be guaranteed. Note: The correct operation of the MLX10803 as a switching mode power supply for voltages lower than the nominal supply voltage is dependent on the forward bias voltage of the used LED. The user must ensure that at low supply voltage the peak current threshold voltage on the RSENSE pin can be reached in order to keep the switching principle working ...
Page 9
... VREF related parameters vs=13.8V, vvref=0V vs=13.8V 2 vs=13.8V 2 vs=13.8V IREF1 related parameters vs=13.8V, viref1=viref1rng 2 vs=13.8V 2 vs=13.8V IREF2 related parameters vs=13.8V, viref1=viref2rng 2 vs=13.8V 2 vs=13.8V DRVGATE related parameters Load current GND, vs=13.8V To GND pin To VS/PWM pin, vs=13.8V Page 9/25 MLX10803 High power LED driver 1 0.1 0.7 V 4.5 5.5 V -20 20 200 500 ns - vswoff 3.8 V 0.1 3 ...
Page 10
... Oscillator is set to 1 MHz, in case the osc is put to an other frequency, toffmax1mhz scales accordingly Oscillator is set to 1 MHz is not recommended Tmon [ s ] Rosc [ k ] 222 Page 10/25 MLX10803 High power LED driver 3 1.5 V 440 k 220 1200 60 Data Sheet ...
Page 11
... EMI requirements. The MLX10803 is an ESD sensitive device and has to be handled according to EN100015 part 1. The MLX10803 will fulfil the requirements in the application according to the specification and to DIN 40839 part 1. The MLX10803 is designed with ESD protection >1000V HBM according to MIL883D. ...
Page 12
... V vspulse4 - vapulse4 -5 -2.5 V vpulse5 Page 12/25 MLX10803 High power LED driver Test condition, Functional status 5000 pulses, functional state C 5000 pulses functional state C 1h, functional state A 1h, functional state A 1 pulse, functional state C functional state C Data Sheet 2/OCT/07 ...
Page 13
... Test pulse definition Test Pulse 200ms V <100µs 12V 10% vpulse1 90% 1µs 2ms 0.5s…5s Test Pulse 2 Ri=10 0.5…5s V 50µs 1µs 90% vpulse2 10% 12V 200ms 3901010803 Rev 025 IC specification High power LED driver t t Page 13/25 MLX10803 Data Sheet 2/OCT/07 ...
Page 14
... Test Pulse 10ms 90ms 12V vpulse3a 100µs 100ns 5ns 10% 90% Test Pulse 100µs vpulse3b 12V 10ms 90ms 90% 10% 3901010803 Rev 025 IC specification t t 5ns 100ns Page 14/25 MLX10803 High power LED driver Data Sheet 2/OCT/07 ...
Page 15
... Test Pulse 4 (Cranking 0.01 V 12V vspulse4 15ms 50 5ms ms Test Pulse 5 (Load Dump 0.5…4 V 90% vpulse5 80V 10% 12V tr = 0.1...10ms td = 40...400ms 3901010803 Rev 025 vapulse4 100 ms t 0.5-20s Pulse 5 t Page 15/25 MLX10803 IC specification High power LED driver Data Sheet 2/OCT/07 ...
Page 16
... A resistor dissipates power which is transformed to heat - - Efficiency is reduced drastically - The light output of the LED is dependent on the supply and the temperature of the resistor The MLX10803 avoids these disadvantages as shown by the following calculation with L=220µH, R Supposed 13.8V bat V ≈ 3.4V example 1; 8V example2; ...
Page 17
... The principle in detail After powering on the MLX10803 the switch becomes open and the current through the LED starts to rise. The rate of current raise is limited by the value of the coil. When the current through the LED reaches half of a maximum value, the ON timer is started, and if during 58.5 clocks of the internal oscillator the maximum current value through the LED is not reached, the driver switches off ...
Page 18
... The coil discharged completely. Thus, at the end of a discharging cycle, the coil doesn’t carry energy anymore. With the next charging cycle, current increases steadily from around zero. This way, large dI/dt transients are completely avoided. 3901010803 Rev 025 IC specification High power LED driver t Page 18/25 MLX10803 Data Sheet 2/OCT/07 ...
Page 19
... RSENSE resistor results in 1.6 watt, but only for 50% of the time in average. The LED(s) with this current will dissipate 32 watt if they have 8V forward voltage. 3901010803 Rev 025 Toff Page 19/25 MLX10803 IC specification High power LED driver Coil 1 > Coil 2 Resistance 1 > Resistance 2 t ...
Page 20
... Rev 025 IC specification MLX10803 Normalized luminous flux Θv/Θv (24V) Θv/Θv =f(V ) (24V) BAT [V] BAT Page 20/25 MLX10803 High power LED driver vs. supply voltage Iled=750mA, fsw=70kHz (@24V Data Sheet 2/OCT/07 ...
Page 21
... It is enough to leave the IREF1 or IREF2 pin unconnected and the internal current source will pull the voltage Vdd – 0.7V. System behaviour can be configured to compensate the dependency of LED light output versus temperature. The example of such compensation is depicted below. 3901010803 Rev 025 Illustration of a possible temperature regulation Page 21/25 MLX10803 IC specification High power LED driver Data Sheet 2/OCT/07 ...
Page 22
... Mechanical Data 9.1. Mechanical data of the MLX10803 package Package of the MLX10803: SOIC8 in accordance to the JEDEC standard TOP VIEW SIDEVIEW MIN. A .061 A1 .004 A0 .055 B .0138 C .0075 D .189 E .150 e H .230 h .010 L .016 .085 3901010803 Rev 025 D/2 E/2 BOTTOM VIEW ...
Page 23
... Restriction of the Use of Certain Hazardous substances, RoHS) and customer requests, Melexis has installed a Roadmap to qualify their package families for lead free processes. For more information on the lead free topic please see quality page at our website: http://www.melexis.com/quality_leadfree.asp 3901010803 Rev 025 IC specification High power LED driver Page 23/25 MLX10803 Data Sheet 2/OCT/07 ...
Page 24
... Iref1 related parameters changed, Iref2 related parameters changed, DRVGATE related parameters changed, Absolute maximum ratings changed 25 1 Oscillator related parameters, ROSC related parameters changed 3901010803 Rev 025 IC specification High power LED driver VREF, NTC IREF1, SETNTC Page 24/25 MLX10803 Date 25.07.04 02.08.04 07.08.04 7.10.04 15.01.05 16.01.05 3.02.05 13.06.05 17.06.05 21.06.05 12.07.05 IREF2 ...
Page 25
... For the latest version of this document our website at: www.melexis.com Or for additional information contact Melexis Direct: Europe and Japan: All other locations: Phone: + Phone: +1 603 223 2362 E-mail: sales_europe@melexis.com E-mail: sales_usa@melexis.com ISO/TS16949 and ISO14001 certified Page 25/25 MLX10803 High power LED driver Data Sheet 2/OCT/07 ...