TPS mA 14W Constant Current Buck LED Driver Micro- Module

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45mA 14W Constant Current Buck LED Driver Micro- Module General Description The Constant Current Buck LED Driver Micro- Module drives maximum 45mA LED current up to 1 LEDs in a single string (maximum

The 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.

1 45mA 14W Constant Current Buck LED Driver Micro- Module General Description The Constant Current Buck LED Driver Micro- Module drives maximum 45mA LED current up to 1 LEDs in a single string (maximum 14W). It integrates all the power components including the power inductor. The 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 35mA LED current as default. The LED current is adjustable from 3mA to 45mA by changing a single external resistor. The module operates at constant switching frequency (4kHz) with low Electro Magnetic Interference (EMI) complying with EN5515 standard. The module has fast control loop to realize fine LED current pulse yielding 256 step PWM dimming resolution at 24Hz for general lighting. Protection feature include thermal shutdown, input under-voltage lockout, LED open-circuit and short-circuit protections. The Micro-Module is available in TO-PMOD 7 pin power package. Easy to Use 7 Pin Package TO-PMOD 7 Pin Package 1.16 x x 4.57 mm (.4 x.39 x.18 in) θ JA = 2 C/W, θ JC = 1.9 C/W (Note 1) RoHS Compliant Features Integrated all power components including the power inductor Wide input voltage range : 4.5V - 36V Constant switching frequency at 4kHz High contrast ratio (Minimum dimming current pulse width < 16µs) Drives up to 1 LEDs in series at 36V input ±3.6% typical LED current accuracy LED current adjustable from 3mA to 45mA Up to 96% efficiency Input Under-Voltage Lock-Out (UVLO) Compatible with ceramic and low ESR capacitors Low Electro Magnetic Interference(EMI) complies with EN5515 standard (Note 2) LED open and short circuit protections Thermal shutdown and RoHS compliant 4 C to +125 C junction temperature range Package Highlights May 17, lead easy-to-use package (Similar to TO-263) Single exposed die attach pad for enhancing thermal performance 1.2 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 V IN, I LED = 35mA EFFICIENCY (%) LED 8LED 1LED Radiated Emissions (EN 5515) LED Current with PWM Dimming 16us dimming pulse ILED(2mA/DIV) VDIM(2V/DIV) 4 μs/div mA 14W Constant Current Buck LED Driver Micro-Module 212 Texas Instruments Incorporated 3181 SNVS86A

2 Typical Application Circuit Connection Diagram Top View 7-Lead TO-PMOD Ordering Information Order Number Supplied As Package Type NSC Package Drawing Package Marking TZE 45 Units in a Rail TZ 25 Units in Tape and Reel TO-PMOD-7 TZA7A TZ TZX 5 Units in Tape and Reel 2

3 Pin Descriptions Pin Number Name Description Function 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 Used to dissipate heat from the package during operation. Must connect to GND directly. 3

4 Absolute Maximum Ratings (Note 3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. Junction Temperature 15 C Storage Temperature Range C to 15 C Peak Reflow Case Temperature (3 sec) 245 C LED+, LED- to GND DIM to GND IADJ, VREF to GND ESD Susceptibility (Note 4) Power Dissipation -.3V to 4V -.3V to 6V -.3V to 5V ±2 kv (All pins Except Pin 6) Internally Limited Operating Ratings (Note 3) LED+, LED- 4.5V to 36V DIM V to 5.5V IADJ V to.2v Junction Temperature (T J ) 4 C to 125 C Electrical Characteristics Limits in standard type are for T J = 25 C unless otherwise stated; limits in boldface type apply over the operating junction temperature range T J of 4 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 T J = 25 C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: V IN =24 V, I LED = 35mA. V IN is the voltage applied across LED+ and GND. I IN is the input current flowing into the LED+ node. I LED is a LED current flowing into the LED- pin. V LED is the voltage applied across LED+ and LED-. V DIM is the voltage applied across the DIM pin to ground. Resistor R IADJ connect from IADJ pin to ground. Resistor R VREF connect from VREF pin to ground. Symbol Parameter Conditions SYSTEM PARAMETERS I IN Input Current V LED = V 4.5V V IN 36V V DIM = V I LED LED Current V LED = 18V R IADJ = Ω T J = 25 C V LED = 18V R IADJ = Ω T J = 25 C to 125 C V LED = 18V R IADJ = Ω T J = 4 C to 125 C I LED 36V LED Current at V IN = 36V V IN = 36V V LED = 24V Min (Note 5) Typ (Note 6) Max (Note 5) Units ma ma ma R IADJ = Ω T J = 25 C V IN = 36V V LED = 24V R IADJ = Ω T J = 25 C to 125 C V IN = 36V V LED = 24V R IADJ = Ω T J = 4 C to 125 C 4

5 Symbol Parameter Conditions I LED-ADJ1 Adjusted LED Current V LED = 18V R IADJ = Ω R VREF = 1.5kΩ T J = 25 C V LED = 18V R IADJ = Ω R VREF = 1.5kΩ T J = 25 C to 125 C V LED = 18V R IADJ = Ω R VREF = 1.5kΩ T J = 4 C to 125 C I LED-ADJ2 Adjusted LED Current V LED = 18V R IADJ = 5Ω T J = 25 C V LED = 18V R IADJ = 5Ω T J = 25 C to 125 C V LED = 18V R IADJ = 5Ω T J = 4 C to 125 C I LED-SHORT LED Short Circuit Current at V IN = 36V V LED = V V IN = 36V DIM = open I LED-LEAK LED- pin leakage current V LED = V V IN = operating max DIM = V f SW Switching Frequency V LED = 12V R IADJ = Ω Min (Note 5) Typ (Note 6) Max (Note 5) Units ma ma ma 1.2 µa khz V DIM DIM Pin Threshold V DIM Increasing V V DIM-HYS DIM Pin Hysteresis.25 V THERMAL CHARACTERISTICS T SD Thermal Shutdown Temperature T J Rising 17 C T SD-HYS Thermal Shutdown Temp. Hysteresis T J Rising 1 C θ JA Junction to Ambient (Note 1) 4 Layer JEDEC Printed Circuit Board, 1 vias, No air flow 2 Layer JEDEC PCB, No air flow 19.3 C/W θ JC Junction to Case No air flow 1.9 C/W 21.5 Note 1: θ JA measured on a 1.75 x 3. four layer board, with one ounce copper, thirty five 12 mil thermal vias, no air flow, and 1W power dissipation. Note 2: EN 5515, 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 1 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

6 Note 5: Min and Max limits are 1% production tested at an ambient temperature (T A ) 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. 6

7 Typical Performance Characteristics Unless otherwise specified, the following conditions apply: V IN = 24V, C IN is a 2.2µF 1V X7R ceramic capacitor for driving 2 7 power LEDs with I LED = 35mA. Single LED forward voltage used is 3.2V. T A = 25 C for efficiency curves and waveforms. 1 Efficiency vs V IN, I LED = 35mA I LED Regulation vs V IN, I LED = 35mA 3 EFFICIENCY (%) LED 1LED 2LED 4LED ILED REGULATION (%) LED 3LED 1LED 4LED Efficiency vs V IN, I LED = 35mA I LED Regulation vs V IN, I LED = 35mA EFFICIENCY (%) LED 8LED 1LED ILED REGULATION (%) LED 8LED 1LED Efficiency vs V IN, I LED = 45mA I LED Regulation vs V IN, I LED = 45mA EFFICIENCY (%) LED 1LED 2LED 4LED ILED REGULATION (%) LED 1LED 3LED 4LED

8 EFFICIENCY (%) Efficiency vs V IN, I LED = 45mA 1 1LED 8LED 95 6LED 9 85 ILED REGULATION (%) I LED Regulation vs V IN, I LED = 45mA 3 2 6LED 1 8LED 1LED Efficiency vs V IN, I LED = 3mA I LED Regulation vs V IN, I LED = 3mA 1 3 EFFICIENCY (%) LED 1LED 2LED 4LED ILED REGULATION (%) LED 3LED 1LED 4LED Efficiency vs V IN, I LED = 3mA I LED Regulation vs V IN, I LED = 3mA EFFICIENCY (%) LED 8LED 1LED ILED REGULATION (%) LED 8LED 1LED

9 LED Current with PWM Dimming V DIM Rising ILED(2mA/DIV) LED Current with PWM Dimming V DIM Falling ILED(2mA/DIV) VDIM(2V/DIV) VDIM(2V/DIV) 2 μs/div 2 μs/div LED Current with PWM Dimming 16µs dimming pulse ILED(2mA/DIV) I IN vs V IN V DIM = V TJ=25 C IIN (ma) TJ=-4 C TJ=125 C VDIM(2V/DIV) μs/div I IN vs V IN LED = open, DIM = open I LED vs V IN 3LED IIN (ma) TJ=25 C TJ=-4 C TJ=125 C ILED (ma) TJ=-4 C TJ=25 C TJ=125 C

10 1 I LED vs V IN V LED = V, DIM = open 1 I IN vs V IN V LED = V, DIM = open 8 TJ=125 C 8 TJ=125 C ILED (ma) 6 4 TJ=-4 C IIN (ma) 6 4 TJ=-4 C 2 TJ=25 C TJ=25 C I LED vs Dimming Duty Ratio I LED vs Dimming Duty Ratio VIN=12V(2LED) VIN=24V(4LED).8 ILED (%) VIN=36V(6LED) ILED (%) VIN=24V(4LED) VIN=36V(6LED) 1. VIN=12V(2LED) DIM DUTY RATIO (%) DIM DUTY RATIO (%) Frequency Deviation vs V IN (4kHz) I LED Regulation vs Temperature 3 FREQUENCY DEVIATION (%) TJ=25 C TJ=-4 C TJ=125 C ILED REGULATION (%) 2 VIN=12V(2LED) 1-1 VIN=36V(6LED) -2 VIN=24V(4LED) TEMPERATURE ( C)

11 35 I LED vs R IADJ 45 I LED vs R VREF R IADJ = Ω ILED (ma) ILED (ma) RIADJ (Ω) RVREF (kω)

12 Block Diagram Operation Description The 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 45- ma LED current. High speed dimming control input allows precision and high resolution brightness control for applications which require fine brightness adjustment. Application Information SETTING THE LED CURRENT The requires no external current sensing resistor for LED current regulation. The average LED current of the is adjustable from 3mA to 45mA by varying the resistance of the resistor according to the following equation and table. For and R IADJ <=499Ω TABLE 1 Example for I LED Setting R IADJ (Ω) R VREF (Ω) I LED (ma) 499 OPEN 3 SHORT OPEN 35 SHORT 1.5k 45 For R IADJ = and R VREF >= 1.5kΩ FIGURE 1. Application Schematic for I LED Setting 12

13 Minimum Switch On-Time The on-time of the internal switch should be no shorter than 4ns. 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. V IN (V) Peak Switch Current Limit The 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 application circuit due to short circuit of LED string. PWM Dimming Control The DIM pin of the 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.7v) to the DIM pin will disable the switching activity of the device but maintain operation of the VCC regulator active. The operation of high speed dimming and very fine dimming control as shown in Figure 2. To ensure normal operation of the, it is recommended to set the dimming frequency not higher than 1/1 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. 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 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 C IN as close as possible to the V IN pin and GND exposed pad (EP). 2. Place C OUT (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. 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 (C OUT ) 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) FIGURE 3. Current Loops FIGURE 2. Shortened Current Slew up Time of the 13

14 FIGURE 4. Complies with EN5515 Radiated Emissions (HORI. / HEIGHT=3.m / RANGE=1m) C IN = 2.2uF, C OUT = 2.2uF, V IN = 36V, I LED = 35mA, No. of LED = FIGURE 5. Complies with EN5515 Radiated Emissions (VERT. / HEIGHT=1.m / RANGE=1m) C IN = 2.2uF, C OUT = 2.2uF, V IN = 36V, I LED = 35mA, No. of LED =

15 Application Circuit Schematic and BOM FIGURE 6. TABLE 1. Bill of Materials, V IN = 18V, I LED = 35mA, No. of LED = 2 5 Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 LED Micro-Module Driver TO-PMOD-7 Texas Instruments TZ 1 C IN 2.2 µf, 1V, X7R 121 Murata GRM32ER72A225KA35L

16 FIGURE 7. TABLE 2. Bill of Materials, V IN = 36V, I LED = 35mA, No.of LED = 1, Complies with EN5515 Radiated Emissions Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 LED Micro-Module Driver TO-PMOD-7 Texas Instruments TZ 1 C IN 2.2 µf, 1V, X7R 121 Murata GRM32ER72A225KA35L 1 C OUT 2.2 µf, 1V, X7R 121 Murata GRM32ER72A225KA35L

17 PCB Layout Diagrams The PCB design is available in the product folder at FIGURE 8. Top Layer and Top Overlay FIGURE 9. Bottom Layer and Bottom Overlay 17

18 FIGURE 1. Top Overlay 18

19 Physical Dimensions inches (millimeters) unless otherwise noted TO-PMOD-7 Pin Package NS Package Number TZA7A 19

20 45mA 14W Constant Current Buck LED Driver Micro-Module

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