LM3530EV-KIT/NOPB

User's Guide SNVA645A – May 2012 – Revised April 2013 AN-1991 LM3530 Evaluation Kit 1 Introduction The LM3530 current mode boost converter supplies the power and controls the current in a series LED string of up to 40V. The 839 mA current limit and 2.7V to 5.5V input voltage range, makes the device a versatile backlight power source ideal for operation with Li+ batteries. The LED current is adjustable from 0 to 29.5 mA via an I2C compatible interface. The 127 different current steps and 8 different maximum LED current levels (full scale LED current) gives a wide range of programmable LED currents. A PWM brightness control input allows for the backlight current to be a function of the brightness code and the PWM duty cycle. Two Ambient Light Sensor inputs are available to interface with two analog output ambient light sensors. These provide for the automatic adjustment of the LED current due to changes in the ambient light. Each ambient light sensor input has independently programmable internal voltage setting resistors which can be made high impedance to reduce power during shutdown. The LM3530's 500 kHz switching frequency allows for high converter efficiency over a wide output voltage range accommodating from 2 to 11 series LEDs. D1-D10 (OSRAM LW_M67C, VF = 3.6V at 20 mA) VOUT VSENSE D10 D7 D8 D9 D6 D5 D3 D4 D2 D1 USBL USBR J18 2 1 2 1 15 RSCL 4.7 k: PWM 16 INT HWEN B2 C2 C3 GND L1 ALS2 (10 PH, ISAT = 820 mA) OVP 15 16 IN CIN (2.2 PF, 10V, 0603) ALS1 (APDS-9005) GND VIN SDA GND SCL VIN/ VUSB SW D1 D2 COUT (1 PF, 50V, 0805) VCC A1OUT VCC A2OUT RA1 (open ALS2 (APDS-9005) B3 LM3530 C1 A2 A1 A3 B1 ILED D3 RA2 (open) A2 A1 RSDA 4.7 k: ALS1 RINT 4.7 k: RHWEN 4.7 k: S1 (40V, Schottky) SCL SDA RSENSE (10:, 1%) HWEN GND PWM INT VCC VIN GND Figure 1. LM3530 Evaluation Board Schematic All trademarks are the property of their respective owners. SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback AN-1991 LM3530 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 1 LM3530 Evaluation Board Bill of Materials 2 LM3530 Evaluation Board Bill of Materials Component Symbol Value Manufacturer Part # Size U1 LED Driver Texas Instruments LM3530 (0.4mm × 1.215mm × 1.615mm) L1 10 µH, ISAT = 820mA, RL = 0.25Ω TDK VLF34014ST-100MR82 (2.8mm x 3mmx 1.4mm) GRM188B31A225KE33 0603 (1.6mm x 0.8mm x 0.8mm) CIN 2 www.ti.com 2.2 µF, 10V TDK COUT 1 µF, 50V TDK GRM21BR71H105KA12 0805 (2mm x 1.25mm x 1.25mm) D1-D10 White LED Osram LW M67C 0805 RHWEN 4.7 kΩ YAEGO RC0603FR-074K7L 0603 RSDA 4.7 kΩ YAEGO RC0603FR-074K7L 0603 RSCL 4.7 kΩ YAEGO RC0603FR-074K7L 0603 RINT 4.7 kΩ YAEGO RC0603FR-074K7L 0603 SOD-323 (1.7mm x 1.3mm x 1.05mm) S1 Schottky, 40V, 500 mA Diodes Incorporated B0540WS RSENSE 10Ω, 1% Vishay CRCW080510R0 FKEA 0805 APDS-9005 (1.6mm x 1.5mm x 0.55mm) APDS-9005 (1.6mm x 1.5mm x 0.55mm) ALS1 0 - 1100 LUX Ambioent Light Sensor ALS2 0 - 1100 LUX Ambioent Light Sensor RA1 not installed 0603 RA2 not installed 0603 CBYP not installed (bottom layer) 0805 Avago Avago AN-1991 LM3530 Evaluation Kit SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated LM3530 Evaluation Board Layout www.ti.com 3 LM3530 Evaluation Board Layout Figure 2. Top Layer Figure 3. Mid Layer 1 SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback AN-1991 LM3530 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 3 LM3530 Evaluation Board Layout www.ti.com Figure 4. Mid Layer 2 Figure 5. Bottom Layer 4 AN-1991 LM3530 Evaluation Kit SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated www.ti.com 4 LM3530 Graphical User Interface (GUI) Instructions LM3530 Graphical User Interface (GUI) Instructions The GUI for the LM3530 is designed to fully demonstrate all the features of the LM3530 High Voltage White LED Backlight Driver. The GUI provides the interface between the PC and the Texas Instruments USB Interface Board + LM3530 Evaluation Board. A picture of the interface program (LM3530.exe) is shown in Figure 6. 5 LM3530 GUI Figure 6. LM3530.exe Program 6 Simple I2C Interface The top middle portion of the GUI has a simple I2C interface (general interface). In this section are three text boxes (I2C ID, Address, and Data). The I2C ID box is pre-loaded with the device address (0x38). For evaluation of the 25V devices with an I2C I.D. of 0x36, simply enter 36 in the I2C ID field. The Address field is writable by the user and accepts one of the LM3530’s register address’s. The Data field is both writable and readable by the user and contains the data to be written or the data to be read back. The Write and Read buttons select either an I2C write or an I2C read. SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback AN-1991 LM3530 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 5 General Configuration Register 7 www.ti.com General Configuration Register The General Configuration Register portion of the GUI contains the programmable features available within the LM3530’s General Configuration Register (see Table 1). The left-most button (en_simple) corresponds to bit 7 of the register and the right-most button (EN_CHIP) corresponds to bit 0. When a button is pushed a logic ‘1’ is written to the appropriate bit. When a button is unpushed a logic zero is written. The FS current slider programs the full scale currents (bits [5:2]). The slider moved fully to the left corresponds to 5mA of full scale current. When a button is pushed or unpushed or the slider is moved to a new location the WR button must be depressed in order to write the new bit settings to the LM3530’s General Configuration Register. Table 1. General Configuration Register Description (0x10) 8 Bit 7 (PWM Simple Enable Bit 6 (PWM Polarity) Bit 5 (EN_PWM) Bit 4 (Full Scale Current Select) Bit 3 (Full Scale Current Select) Bit 2 (Full Scale Current Select) 0 = Simple Interface at PWM Input is Diasbled 1 = Simple Interface at PWM Input is Enabled 0 = PWM active high 1 = PWM active low 0 = LED current is not a function of PWM duty cycle 1 = LED current is a function of duty cycle 000 = 5 mA full-scale current 001 = 8.5 A full-scale current 010 = 12 mA full-scale current 011 = 15.5 mA full-scale current 100 = 19 mA full-scale current 101 = 22.5 mA full-scale current 110 = 26 mA full-scale current 111 = 29.5 mA full-scale current Bit 1 (Mapping Mode Select) Bit 0 (I2C Device Enable) 0 = exponential mapping 1 = linear mapping 0 = Device Disabled 1 = Device Enabled ALS Configuration Register The ALS Configuration Register portion of the GUI contains the programmable features available within the LM3530’s ALS Configuration Register. Table 2 displays this register and the corresponding bit descriptions. The ALS_i1 and ALS_i2 buttons correspond to bits 6 and 5. When a button is pushed a ‘1’ is written to the bit. When a button is unpushed a ‘0’ is written. The Average Time slider corresponds to bits [2:0]. With the slider moved all the way to the left the ALS averaging time is set for 32ms. With this slider moved to the right the ALS averaging time is set for 4.096s. Once a button is pushed (or unpushed) or a slider is moved to the desired location the WR button must be pushed in order to write the new configuration to the ALS Configuration Register. Table 2. ALS Configuration Register Description (0x20) 6 Bit 7 Bit 6 ALS Input Select Bit 5 ALS Input Select N/A 00 = The Average of ALS1 and ALS2 is used to control the LED brightness 01 = ALS1 is used to control the LED brightness 10 = ALS2 is used to control the LED brightness 11 = The ALS input with the highest voltage is used to control the LED brightness Bit 4 ALS Enable Bit 3 ALS Enable 00 or 10 = ALS is disabled. The Brightness Register is used to determine the LED current. 01 = ALS is enabled, but not selected. As a result the Brightness Register is used to determine the LED Current. 11 = ALS inputs are enabled. Ambient light determines the LED current. Bit 2 ALS Averaging Time Bit 1 ALS Averaging Time Bit 0 ALS Averaging Time 000 = 32 ms 001 = 64 ms 010 = 128 ms 011 = 256 ms 100 = 512 ms 101 = 1024 ms 110 = 2048 ms 111 = 4096 ms AN-1991 LM3530 Evaluation Kit SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Brightness Ramp Rate Register (BRR Reg) www.ti.com 9 Brightness Ramp Rate Register (BRR Reg) The BRR Reg portion of the GUI contains the programmable features available within the Brightness Ramp Rate Register. Table 3 displays this register and the corresponding bit descriptions. The left slider rmp up programs bits [3:2] and the right most slider programs bits [1:0]. A slider fully to the left programs the bits with 0’s (8 µs/step) and a slider fully to the right programs the bits with 1’s (65.538 ms/step). Once the slider is moved to the desired location the WR button must be pushed to write the new code to the BRR Register. Table 3. Brightness Ramp Rate Register Description (0x30) Bit 7 N/A 10 Bit 6 N/A Bit 5 (BRRI3) Bit 4 (BRRI2) Bit 3 (BRRI1) 000 = 8 µs/step 001 = 1.024 ms/step 010 = 2.048 ms/step 011 = 4.096 ms/step 100 = 8.192 ms/step 101 = 16.384 ms/step 110 = 32.768 ms/step 111 = 65.538 ms/step ) Bit 2 (BRRD3) Bit 1 (BRRD2) Bit 0 (BRRD1) 000 = 8 µs/step 001 = 1.024 ms/step 010 = 2.048 ms/step 011 = 4.096 ms/step 100 = 8.192 ms/step 101 = 16.384 ms/step 110 = 32.768 ms/step 111 = 65.538 ms/step ALS Zone Information Register The ALS Zone Information Register section of the GUI displays the contents of the ALS Zone Information Register each time the RD button is pushed. Table 4 details the bit information of this register. The (ZC flag set?) text box corresponds to bit [3] and will return a (yes) if a new ALS zone was entered since the last read of the ALS Zone Information Register. The (Zone = ) text box corresponding to bits [2:0], displays the current ALS zone. Table 4. ALS Zone Information Register (0x40) 11 Bit 7 Bit 6t Bit 5 Bit 4 Bit 3 ALS Enable Bit 2 (Z2) N/A N/A N/A N/A 1 = the active ALS input has changed to a new ambient light zone as programmed in the Zone Boundary Registers (ZB0 — ZB3) 0 = no zone change 000 = Zone 0 001 = Zone 1 010 = Zone 2 011 = Zone 3 100 = Zone 4 Bit 1 (Z1) Bit 0 (Z0) Brightness Register (0xA0) The BRGHT Reg portion of the GUI provides Read and Write capabilities for the Brightness Register. The single slider will transition the brightness codes from all zeroes (slider fully left) to all 1’s (slider fully right). When the slider is moved to the desired location the WR button must be pushed in order to write the new Brightness Register code. Alternatively, the hexadecimal code can be entered into the tex tbox to the right of the slider and the WR button can be pushed to write this new code. When the RD button is pushed the Brightness Register contents are read back and displayed in this textbox. Table 5 and Table 6 detail the brightness register codes and their corresponding percentage of full scale current. Table 5 corresponds to the exponential response, and Table 6 corresponds to the linear response (see General Configuration Register bit [1]). SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback AN-1991 LM3530 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 7 Brightness Register (0xA0) www.ti.com Table 5. Brightness Register Data (Exponential Mapping) BRT Data (Hex) 8 % Full Scale Current BRT Data (Hex) % of Full Scale Current BRT Data (Hex) % of Full Scale Current BRT Data (Hex) % of Full Scale Current 0x00 0.00% 0x20 0.500% 0x40 2.953% 0x60 17.813% 0x01 0.080% 0x21 0.523% 0x41 3.125% 0x61 18.750% 0x02 0.086% 0x22 0.555% 0x42 3.336% 0x62 19.922% 0x03 0.094% 0x23 0.586% 0x43 3.500% 0x63 20.859% 0x04 0.102% 0x24 0.617% 0x44 3.719% 0x64 22.266% 0x05 0.109% 0x25 0.656% 0x45 3.906% 0x65 23.438% 0x06 0.117% 0x26 0.695% 0x46 4.141% 0x66 24.844% 0x07 0.125% 0x27 0.734% 0x47 4.375% 0x67 26.250% 0x08 0.133% 0x28 0.773% 0x48 4.648% 0x68 27.656% 0x09 0.141% 0x29 0.820% 0x49 4.922% 0x69 29.297% 0x0A 0.148% 0x2A 0.867% 0x4A 5.195% 0x6A 31.172% 0x0B 0.156% 0x2B 0.914% 0x4B 5.469% 0x6B 32.813% 0x0C 0.164% 0x2C 0.969% 0x4C 5.781% 0x6C 34.453% 0x0D 0.172% 0x2D 1.031% 0x4D 6.125% 0x6D 35.547% 0x0E 0.180% 0x2E 1.078% 0x4E 6.484% 0x6E 38.828% 0x0F 0.188% 0x2F 1.148% 0x4F 6.875% 0x6F 41.016% 0x10 0.203% 0x30 1.219% 0x50 7.266% 0x70 43.203% 0x11 0.211% 0x31 1.281% 0x51 7.656% 0x71 45.938% 0x12 0.227% 0x32 1.359% 0x52 8.047% 0x72 48.438% 0x13 0.242% 0x33 1.430% 0x53 8.594% 0x73 51.406% 0x14 0.250% 0x34 1.523% 0x54 9.063% 0x74 54.141% 0x15 0.266% 0x35 1.594% 0x55 9.609% 0x75 57.031% 0x16 0.281% 0x36 1.688% 0x56 10.078% 0x76 60.703% 0x17 0.297% 0x37 1.781% 0x57 10.781% 0x77 63.984% 0x18 0.320% 0x38 1.898% 0x58 11.250% 0x78 67.813% 0x19 0.336% 0x39 2.016% 0x59 11.953% 0x79 71.875% 0x1A 0.352% 0x3A 2.109% 0x5A 12.656% 0x7A 75.781% 0x1B 0.375% 0x3B 2.250% 0x5B 13.359% 0x7B 79.688% 0x1C 0.398% 0x3C 2.367% 0x5C 14.219% 0x7C 84.375% 0x1D 0.422% 0x3D 2.508% 0x5D 15.000% 0x7D 89.844% 0x1E 0.445% 0x3E 2.648% 0x5E 15.859% 0x7E 94.531% 0x1F 0.469% 0x3F 2.789% 0x5F 16.875% 0x7F 100.00% AN-1991 LM3530 Evaluation Kit SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Brightness Register (0xA0) www.ti.com Table 6. ILED vs. Brightness Register Data (Linear Mapping) BRT Data (Hex) % Full-Scale Current (Linear) BRT Data (Hex) % of FullScale Current (Linear) BRT Data (Hex) % of FullScale Current (Linear) BRT Data (Hex) % of FullScale Current (Linear) 0x00 0.00% 0x20 25.79% 0x40 50.78% 0x60 75.78% 0x01 1.57% 0x21 26.57% 0x41 51.57% 0x61 76.56% 0x02 2.35% 0x22 27.35% 0x42 52.35% 0x62 77.35% 0x03 3.13% 0x23 28.13% 0x43 53.13% 0x63 78.13% 0x04 3.91% 0x24 28.91% 0x44 53.91% 0x64 78.91% 0x05 4.69% 0x25 29.69% 0x45 54.69% 0x65 79.69% 0x06 5.48% 0x26 30.47% 0x46 55.47% 0x66 80.47% 0x07 6.26% 0x27 31.25% 0x47 56.25% 0x67 81.25% 0x08 7.04% 0x28 32.04% 0x48 57.03% 0x68 82.03% 0x09 7.82% 0x29 32.82% 0x49 57.82% 0x69 82.81% 0x0A 8.60% 0x2A 33.60% 0x4A 58.60% 0x6A 83.59% 0x0B 9.38% 0x2B 34.38% 0x4B 59.38% 0x6B 84.38% 0x0C 10.16% 0x2C 35.16% 0x4C 60.16% 0x6C 85.16% 0x0D 10.94% 0x2D 35.94% 0x4D 60.94% 0x6D 85.94% 0x0E 11.72% 0x2E 36.72% 0x4E 61.72% 0x6E 86.72% 0x0F 12.51% 0x2F 37.50% 0x4F 62.50% 0x6F 87.50% 0x10 13.29% 0x30 38.29% 0x50 63.28% 0x70 88.28% 0x11 14.07% 0x31 39.07% 0x51 64.06% 0x71 89.06% 0x12 14.85% 0x32 39.85% 0x52 64.85% 0x72 89.84% 0x13 15.63% 0x33 40.63% 0x53 65.63% 0x73 90.63% 0x14 16.41% 0x34 41.41% 0x54 66.41% 0x74 91.41% 0x15 17.19% 0x35 42.19% 0x55 67.19% 0x75 92.19% 0x16 17.97% 0x36 42.97% 0x56 67.97% 0x76 92.97% 0x17 18.76% 0x37 43.75% 0x57 68.75% 0x77 93.75% 0x18 19.54% 0x38 44.53% 0x58 69.53% 0x78 94.53% 0x19 20.32% 0x39 45.32% 0x59 70.39% 0x79 95.31% 0x1A 21.10% 0x3A 46.10% 0x5A 71.10% 0x7A 96.09% 0x1B 21.88% 0x3B 46.88% 0x5B 71.88% 0x7B 96.88% 0x1C 22.66% 0x3C 47.66% 0x5C 72.66% 0x7C 97.66% 0x1D 23.44% 0x3D 48.44% 0x5D 73.44% 0x7D 98.44% 0x1E 24.22% 0x3E 49.22% 0x5E 74.22% 0x7E 99.22% 0x1F 25.00% 0x3F 50.00% 0x5F 75.00% 0x7F 100.00% SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback AN-1991 LM3530 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 9 ALS Resistor Selector Register 12 www.ti.com ALS Resistor Selector Register The ALS Resistor Select Register section of the GUI controls the internal ALS resistors. Table 7 details the bit information of this register. The two sliders select one of the 16 available internal resistances from either ALS1 to GND or ALS2 to GND. Once the appropriate slider is set to its correct position, the WR button must be pressed in order to load the ALS Resistor Select Register with the new data. A read of the ALSRS register will automatically update the field to the right of the sliders and also update the slider. Table 7. ALS Resistor Select Register Descrption (0x41) Bit 7 (ALSR2A) Bit 6 (ALSR2B) Bit 5 (ALSR2C) 0000 = ALS2 is high impedance 0001 = 13.531 kΩ (73.9 µA at 1V) 0010 =9.011 kΩ (111 µA at 1V) 0011 = 5.4116 kΩ (185 µA at 1V) 0100 = 2.271 kΩ (440 µA at 1V) 0101 = 1.946 kΩ (514 µA at 1V) 0110 = 1.815 kΩ (551 µA at 1V) 0111 = 1.6 kΩ (625 µA at 1V) 1000 = 1.138 kΩ (879 µA at 1V) 1001 = 1.05 kΩ (952 µA at 1V) 1010 = 1.011 kΩ (989 µA at 1V) 1011 = 941Ω (1.063 mA at 1V) 1100 = 759Ω (1.318 mA at 1V) 1101 = 719Ω (1.391 mA at 1V) 1110 = 700Ω (1.429 mA at 1V) 1111 = 667Ω (1.499 mA at 1V) 13 Bit 4 (ALSR2D) Bit 3 (ALSR1A) Bit 2 (ALSR1B) Bit 1 (ALSR1C) Bit 0 (ALSR1D) 0000 = ALS2 is high impedance 0001 = 13.531 kΩ (73.9 µA at 1V) 0010 =9.011 kΩ (111 µA at 1V) 0011 = 5.4116 kΩ (185 µA at 1V) 0100 = 2.271 kΩ (440 µA at 1V) 0101 = 1.946 kΩ (514 µA at 1V) 0110 = 1.815 kΩ (551 µA at 1V) 0111 = 1.6 kΩ (625 µA at 1V) 1000 = 1.138 kΩ (879 µA at 1V) 1001 = 1.05 kΩ (952 µA at 1V) 1010 = 1.011 kΩ (989 µA at 1V) 1011 = 941Ω (1.063 mA at 1V) 1100 = 759Ω (1.318 mA at 1V) 1101 = 719Ω (1.391 mA at 1V) 1110 = 700Ω (1.429 mA at 1V) 1111 = 667Ω (1.499 mA at 1V) Zone Boundary Registers and Zone Target Registers The bottom section of the GUI contains the controls for writing data to the Zone Boundary and Zone Target Registers. The top 5 sliders allow for the 7-bit brightness data to be written to the Zone Target Registers (0 – 4). With the sliders at the bottom corresponding to code 0x00 and the sliders all the way to the top corresponding to code 0x7F. The 4 bottom sliders allow for the 8-bit zone boundary data to be programmed to the Zone Boundary Registers (0 -3). Alternatively, there are text boxes corresponding to each of the Zone Target and Zone Boundary Registers that will accept the raw hex data for each of the registers. Once the data is selected either by moving the slider or by typing the hex number in the appropriate textbox, the (WR 0x06 - 0x0E) button must be pressed in order to write the data to the device. A read from the Zone Boundary and Zone Target Registers is done by pressing the (RD 0x06 – 0x0E) button. 14 Calibrate Current Sink Field The exponential code to LED current characteristic of the LM3530 is designed to produce both a high dimming ratio and an “eye perceived linear” brightness ramp vs. code (exponential response). The LM3530 production devices will undergo a permanent exponential characteristic calibration that insures a high dimming ratio and smooth code to code output current characteristic. Early evaluation boards that utilize engineering samples that have not been production calibrated can be calibrated via the LM3530 GUI. The software calibration is volatile, meaning that it must be repeated any time power is removed from the device and reapplied. To calibrate the output characteristic first apply power to the device. Next, click the calibrate button. The process occurs in a second or so, and the LED exponential characteristic is calibrated until power is removed from the device. Unless specifically informed that the device is an engineering sample, you should assume it is not and therefore the Calibration Current Sink button is not necessary. 10 AN-1991 LM3530 Evaluation Kit SNVA645A – May 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 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