SD16730S

SD16730 8-Bit Constant Current LED Driver DESCRIPTION SD16730 is a special constant current driver for LED display application. The value of constant current can be determined with external resistor. It bases on BICMOS technology and includes an 8bit shift register. Latch and constant current driver. At the output stage, there are eight regulated current sources which provide 280mA constant current for driving LEDs by Bipolar Junction Transistor. SOP-16-300-1.27 FEATURES * Output current adjustable through an external resistor * Serial data in/out * 8 constant-current output channels * Output current: 2-80mA * 20MHz clock frequency * Current accuracy (All output ON) Current accuracy Between Bits 0.4V REXT=490Ω REXT=250Ω REXT=250Ω 62.75 3 4.7 115 115 1 4 3 71.30 ±1 -1 230 230 0.1 3.5 6 5.5 10.5 140 140 140 6 REV:1.1 79.95 1 ±3 0.3 0.3 -5 460 460 0.5 5 9 15 25 20 40 300 300 300 mA uA % V V V V % kΩ kΩ mA mA mA mA mA mA mA nS nS nS nS REXT=490Ω 31.59 63.63 35.90 72.30 40.02 80.97 mA mA Test conditions Min. 3.0 31.96 Typ. 36.20 Max. 5.5 40.54 Unit V mA IOH=-1.0 mA, VDD=3.3 V IOH=-1.0 mA, VDD=5.0 V IOL=1.0 mA, VDD=3.3 V IOL=1.0 mA, VDD=5.0 V VDD:3.0V－5.0V Vout=15.0V, OPEN Vout=15.0V,REXT=490Ω Vout=15.0V,REXT=250Ω VOUT=0.7V,REXT=490Ω VOUT=0.7V,REXT=250Ω VOUT=0.7V,Tamb=-40°C, REXT=490Ω VOUT=0.7V,Tamb=-40°C , REXT=250Ω CLK－ OUTn , LATCH= “H”, ENABLE =“L” LATCH－ OUTn , ENABLE =“L” ENABLE － OUTn , LATCH =“H” CLK－SERIAL OUT RIN(down) - ION Supply Current ON ION TpLH1 Propagation Delay Time (“L” to “H”) TpLH2 TpLH3 TpLH4 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn 2008.11.16 Page 3 of 12 SD16730 Characteristics Symbol TpHL1 Propagation Delay Time (“H” to “L”) TpHL2 TpHL3 TpHL4 Output Rise Time Output Fall Time Maximum CLOCK Rise Time Maximum CLOCK Fall Time tor tof tr tf Test conditions CLK－ OUTn , LATCH = “H”, ENABLE =“L” LATCH－ OUTn , ENABLE =“L” ENABLE － OUTn , LATCH =“H” CLK－SERIAL OUT Min. 4 40 40 Typ. 170 170 170 7 85 70 Max. 340 340 340 150 150 5 5 Unit nS nS nS nS nS nS uS uS PIN CONFIGURATION GND SERIAL-IN CLOCK LATCH OUT0 OUT1 OUT2 OUT3 1 2 3 4 5 6 7 8 16 VDD 15 R-EXT 14 SERIAL-OUT 13 ENABLE 12 OUT7 11 OUT6 10 OUT5 9 OUT4 PIN DESCRIPTIONS Pin No. 1 2 3 4 5 ~ 12 13 14 15 16 Pin Name GND SERIAL-IN CLOCK LATCH OUT0 ~ OUT7 I/O -I I I O I O I -Ground terminal Description Input terminal of a data shift register Input terminal of a clock shift register Input terminal of a data strobe Output terminals Input terminal of output enable (low active) output terminal of a data shift register Input terminal of an external resistor Supply voltage terminal ENABLE SERIAL-OUT R-EXT VDD FUNCTION DESCRIPTION In LED display application, SD16730 can maintain the current nearly no variations among different channels or chips. The maximum current variation range is ±3% between channels and ±6% between chips. This device has only one ground pin shared by signal, output sink current, and power ground. It is advisable to pattern the ground layout with minimized inductance so that the switching noise induced by the input signals and the output sink current would not cause chip malfunction. To prevent drivers’ outputs from damaging by HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 4 of 12 SD16730 overshoot stresses, it is also advisable not to turn off the drivers and scan transistors simultaneously. In order to obtain an ideal constant current output, a suitable output voltage is necessary. Users can get related information about the minimum output voltage from the character table. Even under the same output current condition, the minimum output voltage required for each part is different. The resistor should be placed as close as possible to the R-EXT terminal to avoid the noise influence. TIMING DIAGRAM Note: The latches circuit holds data when LATCH terminal goes low voltage. When LATCH terminal is a high voltage, latch circuit does not hold data, and it passes from the input to the output. When ENABLE terminal is a low voltage, output terminals respond to the data, and on and off does. When ENABLE terminal is a high voltage, it closes with the output terminal regardless of the data. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 5 of 12 SD16730 TIMING WAVEFORM 1. Clock, serial-in, serial-out 2. Clock, serial-in, LATCH, ENABLE , OUTn HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 6 of 12 SD16730 3. OUTn ELECTRICAL CHARACTERISTICS CURVE Output current - REXT resistor IOUT-REXT 100 90 80 70 60 50 40 30 20 10 0 0.1K 1K 10K REXT(Ω) The calculation formula is as follows: IOUT= (VR-EXT /REXT)×16; VR-EXT=1.185V Where, VR-EXT is voltage on R-EXT port, REXT is the external resistance of R-EXT Port. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 7 of 12 SD16730 TEST CIRCUIT DC CHARACTERISTIC AC CHARACTERISTIC HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 8 of 12 SD16730 TYPICAL APPLICATION CIRCUIT Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 9 of 12 SD16730 PACKAGE OUTLINE DIP-16-300-2.54 UNIT: mm SOP-16-300-1.27 UNIT: mm HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 10 of 12 SD16730 MOS DEVICES OPERATE NOTES: Electrostatic charges may exist in many things. Please take following preventive measures to prevent effectively the MOS electric circuit as a result of the damage which is caused by discharge: The operator must put on wrist strap which should be earthed to against electrostatic. Equipment cases should be earthed. All tools used during assembly, including soldering tools and solder baths, must be earthed. MOS devices should be packed in antistatic/conductive containers for transportation. Note：Silan reserves the right to make changes without notice in this specification for the improvement of the design and performance. Silan will supply the best possible product for customers. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 11 of 12 SD16730 Attachment Revision History Data 2008.06.23 2008.11.16 REV 1.0 1.1 Original Modify the “RECOMMENDED OPERATE CONDITION” and ”ELECTRICAL CHARACTERISTICS” Description Page HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.1 2008.11.16 Page 12 of 12