Microsoft Word - SP-DM412-A.003.doc

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1 Version : A.003 Issue Date : 2007/08/27 File Name : SP--A.003.doc Total Pages : 35 3-CHANNEL CONSTANT CURRENT LED DRIVERS WITH LED OPEN DETECTION 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu, Taiwan 300, R.O.C. Tel: Fax:

2 3-CHANNEL CONSTANT CURRENT LED DRIVERS WITH LED OPEN DETECTION General Description is a PWM enabled LED driver specifically designed for LED video display or lighting applications. Each channel has linear adjustable 16-bits (65536 steps) grayscale PWM control current outputs. It incorporates shift registers, data latches, 3-channel constant current circuitry with current value set by 3 external resistors, and built-in oscillator for PWM functioning. Data, clock, and latch buffer outputs are designed for cascading another chip. Its built-in open detection function help users locate LED failures without additional circuits. The output polarity reverse function is designed for more high power LED applications. Features Maximum constant current outputs: 200mA determined by three external resistors Maximum sinking output voltage: 17V Maximum serial-in clock frequency: 20 MHz 16-bit linear PWM control current outputs Built-in buffers for cascading clock, data, and strobe to next driver PWM free-running capability (refresh rate (~ 267 Hz) with internal oscillator (~ 17.5 MHz)) Selectable auto/manual strobe (Patent pending) LED open detection Output polarity reverse function Power supply voltage: 4V ~ 5.5V Applications LED Decorative Lighting Indoor/Outdoor LED Video or Message Display PWM Signal Generator Package SSOP16, SOP16 (with exposed pad), TSSOP16 (with exposed pad), QFN16 (with exposed pad) 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 1

3 Block Diagram 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 2

4 Pin Connection CKI STI SDO GND RREXT DAI GREXT BREXT 7 6 QFN16 (bottom view) VCC DAO BOUT 5 16 CKO STO POL ROUT GOUT Pin Description PIN No. PIN NAME FUNCTION SOP16/SSOP16/TSSOP16: 1 QFN16: 15 SOP16/SSOP16/TSSOP16: 2 QFN16: 16 SOP16/SSOP16/TSSOP16: 3 QFN16: 1 SOP16/SSOP16/TSSOP16: 4 QFN16: 2 SOP16/SSOP16/TSSOP16: 5~7 QFN16: 3~5 SOP16/SSOP16/TSSOP16: 8 QFN16: 9 SOP16/SSOP16/TSSOP16: 9~11 QFN16: 6~8 SOP16/SSOP16/TSSOP16: 12 QFN16: 10 SOP16/SSOP16/TSSOP16: 13 QFN16: 11 SOP16/SSOP16/TSSOP16: 14 QFN16: 12 SOP16/SSOP16/TSSOP16: 15 QFN16: 13 SOP16/SSOP16/TSSOP16: 16 QFN16: 14 DAO CKO STO POL R(G B)OUT GND R(G B)REXT SDO *1 STI CKI DAI VCC Serial data output terminal. Clock output terminal. Strobe output terminal. PWM current output polarity selection: H means is to be LED driver, L means is to be PWM generator. Sink constant current outputs (open-drain). Ground terminal. External resistors connected between R(G B)REXT and GND for driver current value setting. Serial data output trigger mode selection: H means data is shifted out on synchronization to falling edge of CKO, L means data is shifted out on synchronization to rising edge of CKO. Input terminal of data strobe: H means data is latched, L means data on shift register goes through latch (level latch). Synchronous clock input terminal for serial data transfer. Data is sampled at the rising edge of CKI. Serial data input terminal. Power supply terminal. *1 It is recommended that SDO should be set to high level in cascading system applications. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 3

5 Equivalent Circuit of Inputs and Outputs 1. CKI, DAI, STI, SDO terminals 2. POL terminals 3. CKO, DAO, STO terminal 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 4

6 Maximum Ratings (Ta=25 C, Tj(max) = 140 C) CHARACTERISTIC SYMBOL RATING UNIT Supply Voltage VCC -0.3 ~ 7.0 V Input Voltage VIN -0.3 ~ VCC+0.3 V Output Current IOUT 200 ma Output Voltage VOUT -0.3 ~ 17 V Input Clock Frequency FCKI 20 MHz GND Terminal Current IGND 610 ma Power Dissipation Thermal Resistance PD Rth(j-a) 0.77 (QFN16 exposed pad: Ta=25 C) 0.82 ( SSOP16 : Ta=25 C) 1.4 ( SOP16 exposed pad: Ta=25 C) 2.1 ( TSSOP16 exposed pad: Ta=25 C) 150 (QFN16) ( SSOP16 ) 81.2 ( SOP16 exposed pad) 55 ( TSSOP16 exposed pad) Operating Temperature Top -40 ~ 85 C Storage Temperature Tstg -55 ~ 150 C Recommended Operating Condition CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. UNIT Supply Voltage VCC V Output Voltage VOUT Driver On * Output Voltage VOUT Driver Off *2 17 IO OUT (R, G, B) *3 Output Current Input Voltage Input Clock Frequency IOH 1.2 SERIAL-OUT IOL 1.5 VIH 0.8VCC VCC VCC = 4 V ~ 5.5V VIL VCC FCKI Single Chip Operation Cascade Operation (SDO= H, CL=13pF) Cascade Operation (SDO= L, CL=13pF) STI Pulse Width tw STI 20 CKI Pulse Width tw CLK 20 Set-up Time for DAI tsetup(d) 15 Hold Time for DAI thold(d) VCC = 4 V ~ 5.5V 15 Set-up Time for STI tsetup(l) 15 Set-up Time for Internal Strobe tsetup(istb) 1 us Internal Oscillator Frequency FOSC DC 20M 20M 10M W C/W V ma V Hz ns MHz *1 Notice that the power dissipation is limited to its package and ambient temperature. *2 The driver output voltage including any overshoot stress has to be compliant with the maximum voltage (17V). *3 It is recommended to choose good thermal dissipation package such as TSSOP16 (Iout = 100mA ~ 200mA). 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 5

7 Electrical Characteristics (VCC = 5.0 V, Ta = 25 C unless otherwise noted) CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. UNIT Input Voltage H Level VIH CMOS logic level 0.8VCC VCC Input Voltage L Level VIL CMOS logic level GND 0.2VCC V Input Leakage Current IIH VIH = VCC 1.0 IIL VIL = GND 1.0 ua Output Leakage Current IOL VOH = 17 V 1.0 ua Output Voltage (S-OUT) VOL IOL = 1.5 ma 0.2 VOH IOH = 1.2 ma VCC-0.2 V Output Current Skew (Channel-to-Channel) *1 IOL1 ±3 % VOUT = 1.0 V REXT = 120 Ω Output Current Skew (Chip-to-Chip) *2 IOL ma Output Voltage Regulation % / VOUT REXT = 120 Ω VOUT = 1 V ~ 3 V % / V Supply Voltage Regulation % / VCC REXT = 120 Ω 2 Supply Current *3 I DD(off) I DD(off) I DD(on) I DD(off) I DD(on) all pins are open unless VCC and GND Vout = 1.0V Rext = 120Ω all outputs turn off CKI = 20MHz Vout = 1.0V Rext = 120Ω all outputs turn on Vout = 1.0V Rext = 2.9Ω all outputs turn off CKI = 20MHz Vout = 1.0V Rext = 2.9Ω all outputs turn on ma *1 Channel-to-channel skew is defined as the ratio between (any Iout average Iout) and average Iout, where average Iout = (Imax + Imin) / 2. *2 Chip-to-Chip skew is defined as the range into which any output current of any IC falls. *3 IO excluded. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 6

8 Switching Characteristics (VCC = 5.0V, Ta = 25 C unless otherwise noted) CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. UNIT Propagation Delay CKI-to-CKO 11.5 ( L to H ) CKO-to-DAO (SDO = L ) tplh VIH = VCC 8.4 VIL = GND Propagation Delay CKI-to-CKO 7.2 ( H to L ) CKO-to-DAO (SDO = H ) tphl REXTs = 33 Ω 4.0 ns VL = 5.0 V Output Current Rise Time tor 18 RL = 180 Ω Output Current Fall Time tof 12.5 Output Current top *1 CL = 13 pf (Propagation Delay after STI low) 4.7 ms *1 Reload the new PWM data at the end of the last PWM frame. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 7

9 Constant-Current Output Constant-current value of each output channel is set by an external resistor connected between the R(G B)REXT pin and GND individually. The current scale ranging can be adjusted from 5mA to 200mA by varying the resistor value. The output current value is calculated by the following equation: Output Current as a Function of REXT value Iout (ma) REXT (ohm) Output Current as a Function of Output Voltage Iout (ma) Vout (volt) 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 8

10 Input Data Format LED Open Detection provides a real time monitor of LED open detection function without extra components or circuit design. It will be identified as a LED open failure when the output is turned on but the output voltage is below 0.3V. The test result of each channel will write to its correspondent shift register which is in LSB position (R[0], G[0], B[0]) while strobe signal is active. User can refer to timing diagram on page12. Detecting report could be retrieved from serial-out (DAO) data. If the system reads 1 back, that indicates LED is in normal status. But if 0 was retrieved then LED open failure has occurred. In order to make sure LED open detection function is in well operating condition, it is recommended that all the luminance data are wrote to 1 then almost turning on the outputs during detection process. Serial-out Data Format 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 9

11 Output Modulation Technique In order to minimize the harmonic noise and increasing current accuracy, provides a new LED drive technique of output modulation. It mixes traditional Pulse Width Modulation (PWM) represented by MSB 8 bit (Bit[15:8]) with Bit Angle Modulation (BAM) represented by LSB 8 bit (Bit[7:0]). The main benefit of BAM is to drive LED with an equivalent multiple frequencies in the lower intensity of LED light output. Each bit of BAM binary code is effectively allocated a fixed width of phase angles within a modulation cycle. The reference table shows the ratio defined by the binary significance of each bit: bit weighted width The relationships between BAM and PWM in the time domain can be refer to the diagram (not to scale) below: 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 10

12 Timing Diagram 1. CKI-DAI, CKO, DAO 2. CKI-STI 3. STI-OUTn 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 11

13 Timing Diagram 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 12

14 Power Dissipation The power dissipation of a semiconductor chip is limited to its package and ambient temperature, in which the device requires the maximum output current calculated for given operating conditions. The maximum allowable power consumption can be calculated by the following equation: Pd(max)(Watt) = Tj(junction temperature)(max)( C) Ta(ambient temperature)( C) Rth(junction-to-air thermal resistance)( C/Watt) The relationship between power dissipation and operating temperature can be refer to the figure below: 3.0 Power Dissipation Pd(W) TSSOP16 SOP16 SSOP16 QFN16 Tj(max)=140 C Rth(TSSOP16)=55 C/Watt Rth(SOP16)=81.2 C/Watt Rth(SSOP16)=140.2 C/Watt Rth(QFN16)=150 C/Watt Ambient Temperature Ta( C) Based on the Pd(max), the maximum allowable voltage of output terminal can be determined by the following equation: VoutR IoutR DutyR + VoutG IoutG DutyG + VoutB IoutB DutyB < Pd(max)(W) VCC(V) IDD(A) 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 13

15 Typical Application 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 14

16 Typical Application 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 15

17 Typical Application 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 16

18 Typical Application 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 17

19 Typical Application 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 18

20 Package Outline Dimension -SSOP 16 9 E1 E GAUGE PLANE SEATING PLANE 1 8 e b B L DETAIL A D WITH PLATING b b MAX. A1 A2 A BASE METAL c1 DETAIL B c DIMENSIONS IN INCH DIMENSIONS IN MM SYMBOLS MIN. MAX. MIN. MAX. A A A b b c c D E E e 0.025TYP TYP. L Θ CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 19

21 Package Outline Dimension -SOPEX 16 9 D1 1 8 E H E1 1 b 8 e 16 9 D 0.004MAX. A1 A2 A SEATING PLANE L DIMENSIONS IN INCH DIMENSIONS IN MM SYMBOLS MIN. MAX. MIN. MAX. A A b 0.016TYP TYP. D D TYP TYP. E E TYP TYP. e 0.050TYP TYP. H L Θ CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 20

22 Package Outline Dimension -TSSOPEX 16 9 D1 E1 E E2 1 8 e b D S 0.25mm 0.05 A1 A2 A L1 L GAUGE PLANE SEATING PLANE DIMENSIONS IN INCH DIMENSIONS IN MM SYMBOLS MIN. MAX. MIN. MAX. A A A b D D E 0.252TYP. 6.40TYP. E E e 0.026TYP. 0.65TYP. L L TYP. 1.00TYP. S Θ CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 21

23 Package Outline Dimension -QFN 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 22

24 -SSOP Package and Weight(4 Boxes Set) SSOP IC SSOP 100 pcs ICs per Tube Tube 53cm Box 100 Tubes per Box 11cm 10cm 61cm 4 Boxes per Carton Carton 24cm 24cm 64cm Weight Item Description Weight ( Kg ) pcs -SSOP per Tube 0.02±5% 2 Net Weight of one Box 0.40±5% 3 Net Weight of one Carton 1.24±5% 4 Per Carton Set ( 4 Boxes, 40,000 pcs ) 10.84±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 23

25 -SSOP Package and Weight(6 Boxes Set) SSOP IC SSOP Tube 100 pcs ICs per Tube 53cm 11cm Box 10cm 100 Tubes per Box 61cm Carton 6 Boxes per Carton 24cm 34cm 64cm Weight Item Description Weight ( Kg ) pcs -SSOP per Tube 0.02±5% 2 Net Weight of one Box 0.40±5% 3 Net Weight of one Carton ( for 6 Boxes ) 1.44±5% 4 Per Carton Set (6 Boxes, 60,000 pcs ) 15.84±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 24

26 -SSOP Package and Weight SSOP IC SSOP Reel 2,500 pcs ICs per Reel 35cm 1 Reel per Box Box 35cm 5cm 36cm 5 Boxes per Carton Carton 29cm 37cm 38cm Weight Item Description Weight ( Kg ) 1 2,500 pcs -SSOP per Reel 0.71±5% 2 Net Weight of one Box 0.24±5% 3 Net Weight of one Carton 0.90±5% 4 Per Carton Set ( 5 Boxes, 12,500 pcs ) 5.65±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 25

27 -SOPEX Package and Weight(4 Boxes Set) SOP ( Exposed Pad ) IC SOP 50 pcs ICs per Tube Tube 53cm Box 100 Tubes per Box 11cm 10cm 61cm 4 Boxes per Carton Carton 24cm 24cm 64cm Weight Item Description Weight ( Kg ) 1 50 pcs -SOPEX per Tube 0.016±5% 2 Net Weight of one Box 0.40±5% 3 Net Weight of one Carton 1.24±5% 4 Per Carton Set ( 4 Boxes, 20,000 pcs ) 9.24±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 26

28 -SOPEX Package and Weight(6 Boxes Set) SOP ( Exposed Pad ) IC SOP 50 pcs ICs per Tube Tube 53cm 11cm Box 10cm 100 Tubes per Box 61cm Carton 6 Boxes per Carton 24cm 34cm 64cm Weight Item Description Weight ( Kg ) 1 50 pcs -SOPEX per Tube 0.016±5% 2 Net Weight of one Box 0.40±5% 3 Net Weight of one Carton ( for 6 Boxes ) 1.44±5% 4 Per Carton Set (6 Boxes, 30,000 pcs ) 13.44±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 27

29 -SOPEX Package and Weight SOP ( Exposed Pad ) IC SOP Reel 2,500 pcs ICs per Reel 35cm 1 Reel per Box Box 35cm 5cm 36cm 5 Boxes per Carton Carton 29cm 37cm 38cm Weight Item Description Weight ( Kg ) 1 2,500 pcs -SOPEX per Reel 0.97±5% 2 Net Weight of one Box 0.24±5% 3 Net Weight of one Carton 0.90±5% 4 Per Carton Set ( 5 Boxes, 12,500 pcs ) 6.95±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 28

30 -TSSOPEX Package and Weight(4 Boxes Set) TSSOP ( Exposed Pad ) IC TSSOP 75 pcs ICs per Tube Tube 53cm 11cm Box 10cm 100 Tubes per Box 61cm Carton 4 Boxes per Carton 24cm 24cm 64cm Weight Item Description Weight ( Kg ) 1 75 pcs -TSSOPEX per Tube 0.011±5% 2 Net Weight of one Box 0.40±5% 3 Net Weight of one Carton ( for 4 Boxes ) 1.24±5% 4 Per Carton Set ( 4 Boxes, 30,000 pcs ) 7.24±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 29

31 -TSSOPEX Package and Weight(6 Boxes Set) TSSOP ( Exposed Pad ) IC TSSOP 75 pcs ICs per Tube Tube 53cm 11cm Box 10cm 100 Tubes per Box 61cm Carton 6 Boxes per Carton 24cm 34cm 64cm Weight Item Description Weight ( Kg ) 1 75 pcs -TSSOPEX per Tube 0.011±5% 2 Net Weight of one Box 0.40±5% 3 Net Weight of one Carton 1.44±5% 4 Per Carton Set ( 6 Boxes, 45,000 pcs ) 10.44±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 30

32 -TSSOPEX Package and Weight TSSOP ( Exposed Pad ) IC TSSOP Reel 2,500 pcs ICs per Reel 35cm 1 Reel per Box Box 35cm 5cm 36cm 37cm Carton 29cm 37cm 38cm Weight Item Description Weight ( Kg ) 1 2,500 pcs -TSSOPEX per Reel 0.73±5% 2 Net Weight of one Box 0.24±5% 3 Net Weight of one Carton 0.90±5% 4 Per Carton Set ( 5 Boxes, 12,500 pcs ) 5.75±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 31

33 -QFN Package and Weight SOP ( Exposed Pad ) IC QFN Reel 2,500 pcs ICs per Reel 35cm 1 Reel per Box Box 35cm 5cm 36cm 5 Boxes per Carton Carton 29cm 37cm 38cm Weight Item Description Weight ( Kg ) 1 2,500 pcs -QFN per Reel 0.58±5% 2 Net Weight of one Box 0.24±5% 3 Net Weight of one Carton 0.90±5% 4 Per Carton Set ( 5 Boxes, 12,500 pcs ) 5±5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 32

34 Product Ordering Information Part Number Package Type Number / Weight (typ.) Tube / Tray Reel (Box included) -SOPEX SOP (Exposed Pad) 50 pcs / Tube 0.016kg ± 5% 2,500pcs / Reel 0.97kg ± 5% -SSOP SSOP pcs / Tube 0.02kg ± 5% 2,500pcs / Reel 0.71kg ± 5% -TSSOPEX TSSOP (Exposed Pad) 75pcs / Tube 0.011kg ± 5% 2,500pcs / Reel 0.73kg ± 5% -QFN QFN ,500pcs / Reel 0.58kg ± 5% 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 33

35 The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version:A.003 Page 34

Microsoft Word - SP-DM13A-A.003.doc

Microsoft Word - SP-DM13A-A.003.doc Version : A.003 Issue Date : 2007/12/12 File Name Total Pages : 20 : SP--A.003.doc 16-bit Constant Current LED Driver 新竹市科學園區展業一路 9 號 7 樓之 1 9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu,