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LM3463EVM
Page 1: ...AN 2255 LM3463 Evaluation Board User s Guide Literature Number SNVA642 May 2012...
Page 2: ...pply 9 8 Response of the DHC Loop 12 9 Reducing the System Startup Time 12 10 MOSFET Power Dissipation Limit 13 11 Analog Dimming Control 13 12 PWM Dimming Control 13 13 Disabling Output Channel s 17...
Page 3: ...orms of a complete data frame in the serial interface mode 15 10 PWM dimming duty vs code value of a data byte 15 11 Conversion characteristic of the analog voltage to PWM dimming control circuit 17 1...
Page 4: ...imming control interface of the LM3463 can accept standard TTL level PWM signals analog voltage or serial data to control the dimming duty of the four LED groups individually The analog dimming contro...
Page 5: ...four LED groups individually The analog dimming control interface accepts an analog control voltage in the range from 0V to 2 5V to adjust the reference voltage of the linear current regulators which...
Page 6: ...AIL GND 1 F 16V C3 VCC LM3463 Evaluation Board Schematic www ti com 3 LM3463 Evaluation Board Schematic Figure 1 Circuit diagram of the LM3463 evaluation board 4 Bill Of Materials Designator Descripti...
Page 7: ...9 R11 Resistor 1 00k 1 0 1W 0603 CRCW06031K00FKEA Vishay Dale R12 R14 R16 Resistor 1 00 k 1 0 125W 0603 CRCW08051K00FKEA Vishay Dale R18 R20 R22 TP1 TP4 TP6 Terminal Turret 1502 2 Keystone TP8 TP10 TP...
Page 8: ...rd Layout www ti com 5 Board Layout Figure 2 Top Layer Figure 3 Bottom Layer 8 AN 2255 LM3463 Evaluation Board SNVA642 May 2012 Submit Documentation Feedback Copyright 2012 Texas Instruments Incorpora...
Page 9: ...AC DC off line power converter or a DC DC switching converter can be used as a primary power supply The LM3463 evaluation board should connect to the primary power supply via three terminals the VRAI...
Page 10: ...M3463 VRAIL peak is the highest level of VRAIL when the voltage of the OutP pin of the LM3463 equals 0V VDHC_READY is the voltage level that the LM3463 turns all output channels on VRAIL nom is the no...
Page 11: ...m VDHC_READY the LED turn on voltage is defined by RFB1 and RFB2 connected to the VLedFB pin RFB1 RFB2 RFB2 2 5V VDHC_READY VFB R2 VFB 0 15 0 6 RDHC VFB R1 x VRAIL peak www ti com Primary Power Supply...
Page 12: ...ned by the value of the external capacitor C4 The fC LM3463 is governed by the following equation 1 The default value of the C4 on the board is 1 uF which sets the cut off frequency of the DHC loop to...
Page 13: ...OSFET power dissipation limit is about 26 4V by default 11 Analog Dimming Control The reference voltage for the LED current regulators can be adjusted by changing the voltage at the IOUTADJ pin of the...
Page 14: ...e mode the on duty of each output channel is controlled by a data byte of 8 bits wide In this mode the terminals TP12 TP14 and TP16 on the board comprise a serial data interface to receive data bytes...
Page 15: ...End of Frame EOF One data frame LSB MSB BOF www ti com PWM Dimming Control Figure 9 Typical waveforms of a complete data frame in the serial interface mode Figure 10 PWM dimming duty vs code value of...
Page 16: ...ouped into four groups and controlled by the voltage on four terminals individually as listed in the following table Output channel Terminal CH0 CH1 TP12 CH2 CH3 TP14 CH4 TP16 CH5 TP18 The voltage bei...
Page 17: ...as illustrated in the Figure 10 Figure 11 and Figure 12 respectively When a number of the LM3463 evaluation boards are cascaded one of the boards must be set as master unit and the other boards must...
Page 18: ...PEN J6 SHORT 2 3 J9 OPEN VLedFB VCC R2 OPEN R4 OPEN SLAVE 2 LED array 1 LED array 2 LED array 3 VRAIL GND VFB Primary Power Supply TP12 TP14 TP16 LOAD SCLK SDAT Interface to MCU for dimming control PC...
Page 19: ...11 J12 J13 J14 J15 J16 J2 J9 J5 J7 J4 J6 J8 J10 J3 CH0 CH1 CH2 CH3 CH4 CH5 VRAIL GND LM3463 EVALUATION BOARD WARNING HIGH DC VOLTAGE J0 J1 J11 J12 J13 J14 J15 J16 J2 J9 J5 J7 J4 J6 J8 J10 J3 CH0 CH1 C...
Page 20: ...el TA 25 C unless otherwise specified Direct PWM Dimming Mode DC Interface Mode 250Hz 50 dimming duty at DIMn pin 10Hz 3V to 2V ramp at DIMn pin PWM dimming PWM dimming IOUTn delay at VDIMn rising IOU...
Page 21: ...ncy energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES 003 rules which are designed to provide reasonable protection against radio fr...
Page 22: ...na type and its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication This radio transmitter has been approved...
Page 23: ...roduct only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this product or 3 Use of this product only after you obtained the Technical Regulatio...
Page 24: ...property damage personal injury or death If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and in...
Page 25: ...sponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related inf...
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