Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. TPS92550 450mA 14W Constant Current Buck LED Driver MicroModule General Description Package Highlights The TPS92550 Constant Current Buck LED Driver MicroModule drives maximum 450mA LED current up to 10 LEDs in a single string (maximum 14W). It integrates all the power components including the power inductor. The TPS92550 provides a full turn-key, highly efficient solution for wide range of single string LED lighting applications with up to 96% power efficiency. It accepts an input voltage ranging from 4.5V to 36V and delivers a 350mA LED current as default. The LED current is adjustable from 300mA to 450mA by changing a single external resistor. The module operates at constant switching frequency (400kHz) with low Electro Magnetic Interference (EMI) complying with EN55015 standard. The module has fast control loop to realize fine LED current pulse yielding 256–step PWM dimming resolution at 240Hz for general lighting. Protection feature include thermal shutdown, input under-voltage lockout, LED open-circuit and short-circuit protections. The TPS92550 Micro-Module is available in TO-PMOD 7 pin power package. ■ 7 lead easy-to-use package (Similar to TO-263) ■ Single exposed die attach pad for enhancing thermal Applications ■ General Lighting Desk Lamps Cabinet Lamps Decorative Lamps Street Lamps ■ Architecture Lighting Recess Lights Spot Lights Underwater Lights System Performance Efficiency vs VIN , ILED = 350mA 100 EFFICIENCY (%) Easy to Use 7 Pin Package performance ■ 10.2 x 13.8 x 4.6 mm package 8LED 6LED 95 10LED 90 85 30181001 TO-PMOD 7 Pin Package 10.16 x 13.77 x 4.57 mm (0.4 x 0.39 x 0.18 in) θJA = 20°C/W, θJC = 1.9°C/W (Note 1) RoHS Compliant 80 20 24 28 VIN (V) 32 36 30181004 Radiated Emissions (EN 55015) Features ■ Integrated all power components including the power inductor ■ Wide input voltage range : 4.5V - 36V ■ Constant switching frequency at 400kHz ■ High contrast ratio (Minimum dimming current pulse width < 16µs) Drives up to 10 LEDs in series at 36V input ±3.6% typical LED current accuracy LED current adjustable from 300mA to 450mA Up to 96% efficiency Input Under-Voltage Lock-Out (UVLO) Compatible with ceramic and low ESR capacitors Low Electro Magnetic Interference(EMI) complies with EN55015 standard (Note 2) ■ LED open and short circuit protections ■ Thermal shutdown and RoHS compliant ■ –40˚C to +125˚C junction temperature range ■ ■ ■ ■ ■ ■ ■ © 2012 Texas Instruments Incorporated 301810 SNVS806A 30181031 LED Current with PWM Dimming 16us dimming pulse ILED(200mA/DIV) VDIM(2V/DIV) 4 μs/DIV 30181054 www.ti.com TPS92550 450mA 14W Constant Current Buck LED Driver Micro-Module May 17, 2012 TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. Typical Application Circuit 30181046 Connection Diagram 30181026 Top View 7-Lead TO-PMOD Ordering Information Order Number Supplied As TPS92550TZE 45 Units in a Rail TPS92550TZ 250 Units in Tape and Reel TPS92550TZX 500 Units in Tape and Reel www.ti.com Package Type NSC Package Drawing Package Marking TO-PMOD-7 TZA07A TPS92550TZ 2 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. TPS92550 Pin Descriptions Pin Number Name Description 1,2 LED+ Anode of LED string Supply input and rail connection to the anode of the LED string. 3 DIM Dimming signal input Dimming control signal input. Open to enable or apply logic level PWM signal to control the brightness of the LED string. 4 GND Ground Reference point for all stated voltages. Connect to the exposed pad of the package externally. 5 VREF Voltage reference Internal voltage reference output. 6 IADJ LED current adjustment Fine tunning of the LED current by connecting a resistor between this pin and ground. Connect this pin to ground for factory preset current. 7 LED- Cathode of LED string The current return pin of the LED string, connect to the cathode of the LED string. EP Exposed Pad Exposed thermal pad Function Used to dissipate heat from the package during operation. Must connect to GND directly. 3 www.ti.com TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. Junction Temperature Storage Temperature Range Peak Reflow Case Temperature (30 sec) Absolute Maximum Ratings (Note 3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. LED+, LED- to GND DIM to GND IADJ, VREF to GND ESD Susceptibility (Note 4) Power Dissipation -0.3V to 40V -0.3V to 6V -0.3V to 5V ±2 kV (All pins Except Pin 6) Internally Limited Operating Ratings 150°C 0°C to 150°C 245°C (Note 3) LED+, LEDDIM IADJ Junction Temperature (TJ) 4.5V to 36V 0V to 5.5V 0V to 0.2V –40°C to 125°C Electrical Characteristics Limits in standard type are for TJ = 25°C unless otherwise stated; limits in boldface type apply over the operating junction temperature range TJ of –40°C to 125°C. Minimum and maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN =24 V, ILED = 350mA. VIN is the voltage applied across LED+ and GND. IIN is the input current flowing into the LED+ node. ILED is a LED current flowing into the LED- pin. VLED is the voltage applied across LED+ and LED-. VDIM is the voltage applied across the DIM pin to ground. Resistor RIADJ connect from IADJ pin to ground. Resistor RVREF connect from VREF pin to ground. Symbol Parameter Min (Note 5) Typ (Note 6) VLED = 0V 2.0 2.35 2.7 mA VLED = 18V 336 350 361 mA 328 350 361 328 350 370 332 350 359 330 350 359 330 350 366 Conditions Max Units (Note 5) SYSTEM PARAMETERS IIN Input Current ILED LED Current 4.5V ≤ VIN ≤ 36V VDIM = 0V RIADJ = 0Ω RVREF = open TJ = 25°C VLED = 18V RIADJ = 0Ω RVREF = open TJ = 25°C to 125°C VLED = 18V RIADJ = 0Ω RVREF = open TJ = –40°C to 125°C ILED–36V LED Current at VIN = 36V VIN = 36V VLED = 24V RIADJ = 0Ω RVREF = open TJ = 25°C VIN = 36V VLED = 24V RIADJ = 0Ω RVREF = open TJ = 25°C to 125°C VIN = 36V VLED = 24V RIADJ = 0Ω RVREF = open TJ = –40°C to 125°C www.ti.com 4 mA Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. Parameter Conditions Min (Note 5) Typ (Note 6) Max Units (Note 5) ILED-ADJ1 Adjusted LED Current VLED = 18V 432 450 466 429 450 466 429 450 474 287 300 309 283 300 309 283 300 315 800 900 1020 mA 1.2 µA 400 450 kHz 1.0 1.2 V mA RIADJ = 0Ω RVREF = 10.5kΩ TJ = 25°C VLED = 18V RIADJ = 0Ω RVREF = 10.5kΩ TJ = 25°C to 125°C VLED = 18V RIADJ = 0Ω RVREF = 10.5kΩ TJ = –40°C to 125°C ILED-ADJ2 Adjusted LED Current VLED = 18V mA RIADJ = 500Ω RVREF = open TJ = 25°C VLED = 18V RIADJ = 500Ω RVREF = open TJ = 25°C to 125°C VLED = 18V RIADJ = 500Ω RVREF = open TJ = –40°C to 125°C ILED-SHORT ILED-LEAK fSW LED Short Circuit Current at VIN = 36V VLED = 0V VIN = 36V DIM = open “LED-” pin leakage current VLED = 0V VIN = operating max DIM = 0V Switching Frequency VLED = 12V 365 RIADJ = 0Ω RVREF = open VDIM DIM Pin Threshold VDIM-HYS DIM Pin Hysteresis VDIM Increasing 0.25 V THERMAL CHARACTERISTICS TSD TSD-HYS θJA θJC Thermal Shutdown Temperature TJ Rising 170 °C Thermal Shutdown Temp. Hysteresis TJ Rising 10 °C Junction to Ambient (Note 1) 4 Layer JEDEC Printed Circuit Board, 100 vias, No air flow 19.3 °C/W 2 Layer JEDEC PCB, No air flow 21.5 No air flow 1.9 Junction to Case °C/W Note 1: θ JA measured on a 1.705” x 3.0” four layer board, with one ounce copper , thirty five 12 mil thermal vias, no air flow, and 1W power dissipation. Note 2: EN 55015 , refer to Figure 4 and 5. Note 3: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 4: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The Pin 6 ( IADJ pin) pass ± 1kV.Test method is per JESD22-AI14S. 5 www.ti.com TPS92550 Symbol TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. Note 5: Min and Max limits are 100% production tested at an ambient temperature (TA) of 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate National’s Average Outgoing Quality Level (AOQL). Note 6: Typical numbers are at 25°C and represent the most likely parametric norm. www.ti.com 6 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. ILED Regulation vs VIN, ILED = 350mA Efficiency vs VIN, ILED = 350mA 3 100 3LED 4LED 90 ILED REGULATION (%) EFFICIENCY (%) 95 85 80 2LED 75 1LED 70 65 60 2 3LED 2LED 1 4LED 0 1LED -1 -2 -3 0 4 8 12 16 20 24 28 32 36 VIN (V) 0 4 8 12 16 20 24 28 32 36 VIN (V) 30181002 30181003 ILED Regulation vs VIN, ILED = 350mA Efficiency vs VIN, ILED = 350mA 3 8LED 6LED 95 10LED ILED REGULATION (%) EFFICIENCY (%) 100 90 85 80 2 6LED 8LED 1 10LED 0 -1 -2 -3 20 24 28 VIN (V) 32 36 20 24 28 VIN (V) 32 30181004 30181005 Efficiency vs VIN, ILED = 450mA ILED Regulation vs VIN, ILED = 450mA 3 100 3LED 90 4LED ILED REGULATION (%) 95 EFFICIENCY (%) 36 85 80 2LED 75 70 1LED 65 60 2 3LED 1 4LED 2LED 0 -1 1LED -2 -3 0 4 8 12 16 20 24 28 32 36 VIN (V) 0 30181006 4 8 12 16 20 24 28 32 36 VIN (V) 30181007 7 www.ti.com TPS92550 Typical Performance Characteristics Unless otherwise specified, the following conditions apply: VIN = 24V, CIN is a 2.2µF 100V X7R ceramic capacitor for driving 2–7 power LEDs with ILED = 350mA. Single LED forward voltage used is 3.2V. TA = 25°C for efficiency curves and waveforms. TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. Efficiency vs VIN, ILED = 450mA ILED Regulation vs VIN, ILED = 450mA 3 10LED 8LED 6LED 95 ILED REGULATION (%) EFFICIENCY (%) 100 90 85 80 2 6LED 8LED 1 10LED 0 -1 -2 -3 20 24 28 VIN (V) 32 36 20 24 28 VIN (V) 32 36 30181008 30181009 ILED Regulation vs VIN, ILED = 300mA Efficiency vs VIN, ILED = 300mA 3 100 3LED 4LED 90 ILED REGULATION (%) EFFICIENCY (%) 95 85 80 2LED 75 1LED 70 65 60 2 3LED 2LED 1 4LED 0 1LED -1 -2 -3 0 4 8 12 16 20 24 28 32 36 VIN (V) 0 4 8 12 16 20 24 28 32 36 VIN (V) 30181010 30181011 Efficiency vs VIN, ILED = 300mA ILED Regulation vs VIN, ILED = 300mA 3 6LED 95 10LED 8LED ILED REGULATION (%) EFFICIENCY (%) 100 90 85 80 8LED 1 10LED 0 -1 -2 -3 20 24 28 VIN (V) 32 36 20 30181012 www.ti.com 6LED 2 24 28 VIN (V) 32 36 30181013 8 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. TPS92550 LED Current with PWM Dimming VDIMRising LED Current with PWM Dimming VDIMFalling ILED(200mA/DIV) ILED(200mA/DIV) VDIM(2V/DIV) VDIM(2V/DIV) 2 μs/DIV 2 μs/DIV 30181052 30181053 LED Current with PWM Dimming 16µs dimming pulse IIN vs VIN VDIM = 0V 3.0 ILED(200mA/DIV) TJ=25°C 2.5 IIN (mA) 2.0 VDIM(2V/DIV) TJ=-40°C 1.5 TJ=125°C 1.0 0.5 0.0 0 4 μs/DIV 4 8 12 16 20 24 28 32 36 VIN (V) 30181054 30181014 ILED vs VIN 3LED IIN vs VIN LED = open , DIM = open 450 3.5 TJ=25°C 3.0 400 2.5 2.0 TJ=-40°C TJ=125°C ILED (mA) IIN (mA) TJ=-40°C 350 1.5 300 TJ=25°C 250 200 TJ=125°C 150 1.0 100 0.5 50 0.0 0 0 4 8 12 16 20 24 28 32 36 VIN (V) 0 30181016 4 8 12 16 20 24 28 32 36 VIN (V) 30181015 9 www.ti.com TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. ILED vs VIN VLED = 0V, DIM = open IIN vs VIN VLED = 0V, DIM = open 1000 100 TJ=125°C 600 80 IIN (mA) ILED (mA) 800 TJ=-40°C 400 200 TJ=125°C 60 TJ=-40°C 40 20 TJ=25°C 0 TJ=25°C 0 0 4 8 12 16 20 24 28 32 36 VIN (V) 0 4 8 12 16 20 24 28 32 36 VIN (V) 30181017 30181018 ILED vs Dimming Duty Ratio ILED vs Dimming Duty Ratio 100 1.0 90 VIN=12V(2LED) 80 60 ILED (%) ILED (%) 0.8 VIN=24V(4LED) 70 50 40 0.6 VIN=24V(4LED) 0.4 VIN=36V(6LED) 30 VIN=36V(6LED) 20 0.2 10 0 VIN=12V(2LED) 0.0 0 10 20 30 40 50 60 70 80 90 100 DIM DUTY RATIO (%) 0.0 0.2 0.4 0.6 0.8 DIM DUTY RATIO (%) 1.0 30181019 30181020 ILED Regulation vs Temperature Frequency Deviation vs VIN (400kHz) 3 2 ILED REGULATION (%) FREQUENCY DEVIATION (%) 3 TJ=-40°C 1 TJ=25°C 0 -1 TJ=125°C -2 1 0 VIN=36V(6LED) -1 -2 VIN=24V(4LED) -3 -3 8 12 16 20 24 VIN (V) 28 32 -50 36 -25 0 25 50 75 TEMPERATURE (°C) 100 125 30181022 30181021 www.ti.com VIN=12V(2LED) 2 10 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. ILED vs RVREF RIADJ = 0Ω 350 450 340 425 330 ILED (mA) ILED (mA) TPS92550 ILED vs RIADJ RVREF = open 320 400 375 310 300 350 0 100 200 300 RIADJ (Ω) 400 500 0 30181023 20 40 60 RVREF (kΩ) 80 100 30181024 11 www.ti.com TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. Block Diagram 30181027 TABLE 1 Example for ILED Setting Operation Description The TPS92550 is a high power floating buck LED driver with wide input voltage range. It requires no external current sensing elements and loop compensation network. The integrated power switch enables high output power up to 14W with 450mA LED current. High speed dimming control input allows precision and high resolution brightness control for applications which require fine brightness adjustment. RIADJ(Ω) RVREF(Ω) ILED(mA) 499 OPEN 300 SHORT OPEN 350 SHORT 10.5k 450 Application Information SETTING THE LED CURRENT The TPS92550 requires no external current sensing resistor for LED current regulation. The average LED current of the TPS92550 is adjustable from 300mA to 450mA by varying the resistance of the resistor according to the following equation and table. For RVREF = open and RIADJ <=499Ω For RIADJ = 0 and RVREF >= 10.5kΩ 30181047 FIGURE 1. TPS92550 Application Schematic for ILED Setting www.ti.com 12 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. The on-time of the internal switch should be no shorter than 400ns. The number of LED (typical forward voltage at 3.2V) to input voltage is constrained by that as shown in the following table. No. of LED Max. VIN(V) 1 20 2 – 10 36 PC Board Layout Considerations The TPS92550 features an integrated switch current limiting mechanism to prevent the LEDs from being over-driven. The switch current limiter is triggered when the switch current is three times exceeding the current level set by resistor. Once the current limiter is triggered, the internal power switch turn OFF for 3.6µs to discharge the inductor until inductor current reduces back to normal level. The current limiting feature is exceptionally important to avoid permanent damage of the TPS92550 application circuit due to short circuit of LED string. The overall performance of the LED driver is highly depends on the PCB layout. Poor board layout can disrupt the performance of the TPS92550 and surrounding circuitry by contributing to EMI, ground bounce and resistive voltage drop in the traces. These can send erroneous signals to the LED driver resulting in poor regulation and stability. Good layout can be implemented by following a few simple design rules. 1. Place CIN as close as possible to the VIN pin and GND exposed pad (EP). 2. Place COUT (optional for reduction of LED current ripple and EMI compliance) as close as possible to the VLED+ pin and VLED- pin. 3. The exposed pad (EP) must connect to the GND pin directly. PWM Dimming Control EMI Design Considerations The DIM pin of the TPS92550 is an input with internal pull-up that accepts logic signals for average LED current control. Applying a logic high (above 1.2V) signal to the DIM pin or leaving the DIM pin open will enable the device. Applying a logic low signal (below 0.7V) to the DIM pin will disable the switching activity of the device but maintain operation of the VCC regulator active. The TPS92550 operation of high speed dimming and very fine dimming control as shown in Figure 2. From an EMI reduction standpoint, it is imperative to minimize the di/dt current paths (refer to Figure 3). Therefore, it is essential to connect an 2.2µF capacitor (COUT) across the LED + pin and LED- pin. This will minimize the ripple current so that it can reduce radiated EMI (refer to Figure 4 and 5). Peak Switch Current Limit 30181030 FIGURE 3. Current Loops 30181029 FIGURE 2. Shortened Current Slew up Time of the TPS92550 13 www.ti.com TPS92550 To ensure normal operation of the TPS92550, it is recommended to set the dimming frequency not higher than 1/10 of the switching frequency. The dim pulse on time is tested down to 16µs. In applications that require high dimming contrast ratio, low dimming frequency should be used. Minimum Switch On-Time TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. 30181031 FIGURE 4. Complies with EN55015 Radiated Emissions (HORI. / HEIGHT=3.0m / RANGE=10m) CIN = 2.2uF, COUT = 2.2uF, VIN = 36V, ILED = 350mA, No. of LED = 10 30181032 FIGURE 5. Complies with EN55015 Radiated Emissions (VERT. / HEIGHT=1.0m / RANGE=10m) CIN = 2.2uF, COUT = 2.2uF, VIN = 36V , ILED = 350mA, No. of LED = 10 www.ti.com 14 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. TPS92550 TPS92550 Application Circuit Schematic and BOM 30181033 FIGURE 6. TABLE 1. Bill of Materials, VIN = 18V , ILED = 350mA, No. of LED = 2 — 5 Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 LED Micro-Module Driver TO-PMOD-7 Texas Instruments TPS92550TZ 1 CIN 2.2 µF, 100V, X7R 1210 Murata GRM32ER72A225KA35L 1 15 www.ti.com TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. 30181034 FIGURE 7. TABLE 2. Bill of Materials, VIN = 36V , ILED = 350mA , No.of LED = 10, Complies with EN55015 Radiated Emissions Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 LED Micro-Module Driver TO-PMOD-7 Texas Instruments TPS92550TZ 1 CIN 2.2 µF, 100V, X7R 1210 Murata GRM32ER72A225KA35L 1 COUT 2.2 µF, 100V, X7R 1210 Murata GRM32ER72A225KA35L 1 www.ti.com 16 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. TPS92550 PCB Layout Diagrams The PCB design is available in the TPS92550 product folder at www.ti.com. 30181050 FIGURE 8. Top Layer and Top Overlay 30181040 FIGURE 9. Bottom Layer and Bottom Overlay 17 www.ti.com TPS92550 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. 30181051 FIGURE 10. Top Overlay www.ti.com 18 Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. TPS92550 Physical Dimensions inches (millimeters) unless otherwise noted TO-PMOD-7 Pin Package NS Package Number TZA07A 19 www.ti.com TPS92550 450mA 14W Constant Current Buck LED Driver Micro-Module Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. www.ti.com Please click http://www.datasheet5.com/search_smf_4129.html for more products of Texas Instruments,Inc. IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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