TPS92551 450mA 23W Constant Current Buck LED Driver MicroModule General Description Package Highlights The TPS92551 Constant Current Buck LED Driver MicroModule drives maximum 450mA LED current up to 16 LEDs in a single string (maximum 23W). It integrates all the power components including the power inductor. The TPS92551 provides a full turn-key, highly efficient solution for wide range of single string LED lighting applications with up to 95% power efficiency. It accepts an input voltage ranging from 4.5V to 60V and delivers a 350mA LED current as default. The LED current is adjustable from 300mA to 450mA by charging a single external resistor. The module operates at constant switching frequency (800kHz) 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 features include thermal shutdown, input under-voltage lockout, LED open-circuit and short-circuit protections. The TPS92551 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 enhanced thermal Easy to Use 7 Pin Package performance ■ 10.2 x 13.8 x 4.6 mm package 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 10LED EFFICIENCY (%) 95 30172701 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 16LED 14LED 6LED 90 85 80 75 25 30 35 40 45 VIN (V) 50 55 60 30172750 Radiated Emissions (EN 55015) Features ■ Integrated all power components including the power inductor ■ Wide input voltage range : 4.5V - 60V ■ Constant switching frequency at 800kHz ■ High contrast ratio (Minimum dimming current pulse width < 16µs) Drives up to 16 LEDs in series at 60V input ±3.5% typical LED current accuracy LED current adjustable from 300mA to 450mA Up to 95% 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 ■ ■ ■ ■ ■ ■ ■ 30172731 LED Current with PWM Dimming 16us dimming pulse ILED(200mA/DIV) VDIM(2V/DIV) 4 μs/DIV 30172742 © 2012 Texas Instruments Incorporated 301727 SNVS805A www.ti.com TPS92551 450mA 23W Constant Current Buck LED Driver Micro-Module May 17, 2012 TPS92551 Typical Application Circuit 30172746 Connection Diagram 30172726 Top View 7-Lead TO-PMOD Ordering Information Order Number Supplied As TPS92551TZE 45 Units in a Rail TPS92551TZ 250 Units in Tape and Reel TPS92551TZX 500 Units in Tape and Reel www.ti.com Package Type NSC Package Drawing Package Marking TO-PMOD-7 TZA07A TPS92551TZ 2 TPS92551 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 TPS92551 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 Operating Ratings -0.3V to 67V -0.3V to 6V -0.3V to 5V ±2 kV (All Pins Except Pin 6) Internally Limited 150°C 0°C to 150°C 245°C (Note 3) LED+, LEDDIM IADJ Junction Temperature (TJ) 4.5V to 60V 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 =48 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 2.1 2.65 3.0 mA VLED = 24V 340 350 364 mA 337 350 364 337 350 371 342 350 367 338 350 367 338 350 374 Conditions Max Units (Note 5) SYSTEM PARAMETERS IIN Input Current ILED LED Current 4.5V ≤ VIN ≤ 60V VDIM = 0V RIADJ = 0Ω RVREF = open TJ = 25°C VLED = 24V RIADJ = 0Ω RVREF = open TJ = 25°C to 125°C VLED = 24V RIADJ = 0Ω RVREF = open TJ = -40°C to 125°C ILED–60V LED Current at VIN = 60V VIN = 60V VLED = 36V RIADJ = 0Ω RVREF = open TJ = 25°C VIN = 60V VLED = 36V RIADJ = 0Ω RVREF = open TJ = 25°C to 125°C VIN = 60V VLED = 36V RIADJ = 0Ω RVREF = open TJ = -40°C to 125°C www.ti.com 4 mA Parameter Conditions Min (Note 5) Typ (Note 6) Max Units (Note 5) ILED-ADJ1 Adjusted LED Current VLED = 24V 442 450 471 437 450 471 437 450 483 288 300 309 282 300 309 282 300 316 800 920 1020 mA 1.2 µA 800 920 kHz 1.0 1.3 V mA RIADJ = 0Ω RVREF = 10.5kΩ TJ = 25°C VLED = 24V RIADJ = 0Ω RVREF = 10.5kΩ TJ = 25°C to 125°C VLED = 24V RIADJ = 0Ω RVREF = 10.5kΩ TJ = -40°C to 125°C ILED-ADJ2 Adjusted LED Current VLED = 24V mA RIADJ = 500Ω RVREF = open TJ = 25°C VLED = 24V RIADJ = 500Ω RVREF = open TJ = 25°C to 125°C VLED = 24V RIADJ = 500Ω RVREF = open TJ = -40°C to 125°C ILED-SHORT ILED-LEAK fSW LED Short Circuit Current at VIN = 60V VLED = 0V VIN = 60V DIM = open “LED-” pin leakage current VLED = 0V VIN = operating max DIM = 0V Switching Frequency VLED = 24V 720 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 TPS92551 Symbol TPS92551 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 Efficiency vs VIN, ILED = 350mA ILED Regulation vs VIN, ILED = 350mA 3 100 90 ILED REGULATION (%) EFFICIENCY (%) 95 4LED 85 80 3LED 2LED 75 1LED 70 65 60 2 1 2LED 3LED 0 4LED 1LED -1 -2 -3 0 10 20 VIN (V) 30 40 0 10 20 VIN (V) 30 40 30172702 30172703 Efficiency vs VIN, ILED = 350mA ILED Regulation vs VIN, ILED = 350mA 100 3 EFFICIENCY (%) 16LED 14LED ILED REGULATION (%) 10LED 95 6LED 90 85 80 75 2 1 6LED 10LED 14LED 16LED 0 -1 -2 -3 25 30 35 40 45 VIN (V) 50 55 60 25 30 35 40 45 VIN (V) 50 55 30172750 30172751 Efficiency vs VIN, ILED = 450mA ILED Regulation vs VIN, ILED = 450mA 3 100 90 ILED REGULATION (%) 95 EFFICIENCY (%) 60 4LED 85 80 2LED 3LED 75 70 1LED 65 60 2 3LED 1 1LED 0 4LED -1 2LED -2 -3 0 10 20 VIN (V) 30 40 0 30172706 10 20 VIN (V) 30 40 30172707 7 www.ti.com TPS92551 Typical Performance Characteristics Unless otherwise specified, the following conditions apply: VIN = 48V, CIN is a 2.2µF 100V X7R ceramic capacitor for driving 5–13 power LEDs with ILED = 350mA. Single LED forward voltage used is 3.2V. TA = 25°C for efficiency curves and waveforms. TPS92551 Efficiency vs VIN, ILED = 450mA ILED Regulation vs VIN, ILED = 450mA 100 3 EFFICIENCY (%) 16LED 14LED ILED REGULATION (%) 10LED 95 6LED 90 85 80 75 2 1 10LED 0 6LED -1 14LED 16LED -2 -3 25 30 35 40 45 VIN (V) 50 55 60 25 30 35 40 45 VIN (V) 50 55 60 30172752 30172753 Efficiency vs VIN, ILED = 300mA ILED Regulation vs VIN, ILED = 300mA 3 100 4LED 90 ILED REGULATION (%) EFFICIENCY (%) 95 85 3LED 2LED 80 75 1LED 70 65 60 2 1 4LED 0 1LED -1 2LED 3LED -2 -3 0 10 20 VIN (V) 30 40 0 10 20 VIN (V) 30 40 30172710 30172711 Efficiency vs VIN, ILED = 300mA ILED Regulation vs VIN, ILED = 300mA 100 6LED 10LED 14LED 16LED ILED REGULATION (%) EFFICIENCY (%) 95 3 90 85 80 75 6LED 1 10LED 14LED 16LED 0 -1 -2 -3 25 30 35 40 45 VIN (V) 50 55 60 25 30172754 www.ti.com 2 30 35 40 45 VIN (V) 50 55 60 30172755 8 TPS92551 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 30172744 30172743 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 TJ=-40°C TJ=125°C 1.5 1.0 VDIM(2V/DIV) 0.5 0.0 0 4 μs/DIV 10 20 30 40 VIN (V) 50 30172742 30172756 IIN vs VIN LED = open , DIM = open 4.0 ILED vs VIN 6LED 450 TJ=25°C 3.5 400 TJ=-40°C 350 TJ=-40°C 2.5 2.0 ILED (mA) 3.0 IIN (mA) 60 TJ=125°C 1.5 300 TJ=25°C 250 TJ=125°C 200 150 1.0 100 0.5 50 0.0 0 0 10 20 30 40 VIN (V) 50 60 0 30172757 10 20 30 40 VIN (V) 50 60 30172758 9 www.ti.com TPS92551 ILED vs VIN VLED = 0V, DIM = open 1000 IIN vs VIN VLED = 0V, DIM = open 100 TJ=-40°C TJ=125°C 80 TJ=25°C 600 IIN (mA) ILED (mA) 800 TJ=125°C 400 60 TJ=-40°C 40 TJ=25°C 200 20 0 0 0 10 20 30 40 VIN (V) 50 60 0 10 20 30 40 VIN (V) 50 30172759 30172760 ILED vs Dimming Duty Ratio ILED vs Dimming Duty Ratio 100 1.0 90 VIN=48V(8LED) 80 0.8 VIN=36V(6LED) 60 ILED (%) ILED (%) 70 50 40 0.6 VIN=48V(8LED) 0.4 30 20 VIN=60V(11LED) 0.2 10 VIN=60V(11LED) 0 VIN=36V(6LED) 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 (%) 30172719 ILED Regulation vs Temperature 3 TJ=-40°C 1 ILED REGULATION (%) FREQUENCY DEVIATION (%) 3 2 TJ=25°C 0 -1 -2 TJ=125°C 25 30 35 40 45 VIN (V) 2 VIN=48V(8LED) 1 0 -1 V =60V(11LED) IN -2 VIN=36V(6LED) -3 -3 20 1.0 30172720 Frequency Deviation vs VIN (800kHz) 50 55 -50 60 -25 0 25 50 75 TEMPERATURE (°C) 100 125 30172722 30172761 www.ti.com 60 10 ILED vs RVREF RIADJ =0Ω 350 450 340 425 330 ILED (mA) ILED (mA) TPS92551 ILED vs RIADJ RVREF = open 320 400 375 310 300 350 0 100 200 300 RIADJ (Ω) 400 500 0 30172723 20 40 60 RVREF (kΩ) 80 100 30172724 11 www.ti.com TPS92551 Block Diagram 30172762 TABLE 1 Example for ILED Setting Operation Description The TPS92551 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 23W 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 TPS92551 requires no external current sensing resistor for LED current regulation. The average LED current of the TPS92551 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 30172747 FIGURE 1. TPS92551 Application Schematic for ILED Setting www.ti.com 12 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 10 2 20 3 30 4 40 5 50 6 – 16 60 PC Board Layout Considerations The overall performance of the LED driver is highly depends on the PCB layout. Poor board layout can disrupt the performance of the TPS92551 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. Peak Switch Current Limit The TPS92551 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 TPS92551 application circuit due to short circuit of LED string. EMI Design Considerations 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). PWM Dimming Control The DIM pin of the TPS92551 is an input with internal pull-up that accepts logic signals for average LED current control. Applying a logic high (above 1.3V) 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 TPS92551 operation of high speed dimming and very fine dimming control as shown in Figure 2. 30172730 FIGURE 3. Current Loops 30172729 FIGURE 2. Shortened Current Slew up Time of the TPS92551 13 www.ti.com TPS92551 To ensure normal operation of the TPS92551, 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 TPS92551 30172731 FIGURE 4. Complies with EN55015 Radiated Emissions (HORI. / HEIGHT=3.0m / RANGE=10m) CIN = 2.2uF, COUT = 2.2uF VIN = 60V, ILED = 350mA, No. of LED = 16 30172732 FIGURE 5. Complies with EN55015 Radiated Emissions (VERT. / HEIGHT=1.0m / RANGE=10m) CIN = 2.2uF, COUT = 2.2uF VIN = 60V , ILED = 350mA, No. of LED = 16 www.ti.com 14 TPS92551 TPS92551 Application Circuit Schematic and BOM 30172733 FIGURE 6. TABLE 1. Bill of Materials, VIN = 48V , ILED = 350mA, No. of LED = 5 –13 Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 LED Micro-Module Driver TO-PMOD-7 Texas Instruments TPS92551TZ 1 CIN 2.2 µF, 100V, X7R 1210 Murata GRM32ER72A225KA35L 1 15 www.ti.com TPS92551 30172734 FIGURE 7. TABLE 2. Bill of Materials, VIN = 60V , ILED = 350mA , No.of LED = 16, Complies with EN55015 Radiated Emissions Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 LED Micro-Module Driver TO-PMOD-7 Texas Instruments TPS92551TZ 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 TPS92551 PCB Layout Diagrams The PCB design is available in the TPS92551 product folder at www.ti.com. 30172763 FIGURE 8. Top Layer and Top Overlay 30172740 FIGURE 9. Bottom Layer and Bottom Overlay 17 www.ti.com TPS92551 30172764 FIGURE 10. Top Overlay www.ti.com 18 TPS92551 Physical Dimensions inches (millimeters) unless otherwise noted TO-PMOD-7 Pin Package NS Package Number TZA07A 19 www.ti.com www.ti.com TPS92551 450mA 23W Constant Current Buck LED Driver Micro-Module 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. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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