PJL4115SR

PJL4115SR High Brightness Step-Down LED Driver Description The PJL4115SR is a high-efficiency step-down LED driver controller with a wide input voltage range of 6V to 30V. It is designed to operate in continuous current mode. The PJL4115SR employs a hysteretic control architecture that accurately regulates LED current with a feedback coming from an external high-side current-sense resistor. This control scheme optimizes circuit stabilization and fast response time without loop compensation. Its low 200mV average feedback voltage reduces power loss and improves the converter’s efficiency. The PJL4115SR implements PWM and analog dimming together through the DIM pin. It also Includes thermal overload protection in case of output overload. Features  Wide 6V to 30V Input Range  Able to Drive ＜1.5A LED Load  High Efficiency  Open LED Protection  No need compensation  Thermal Shutdown  Hysteresis Control  RoHS and Halogen free compliance  Available in SOT-89-5 Package Applications  Automotive/Decorative LED Lighting  Emergency Lighting  LED Backlighting  Low Voltage Halogen Replacement Typical Application www.pingjingsemi.com Revision: 2.0 Apr-2022 1/9 PJL4115SR High Brightness Step-Down LED Driver Pin Function And Descriptions SOT-89-5 5.VIN 4.CSN 4115 1.SW 2.GND 3.DIM Pin No. Symbol 1 SW 2 GND 3 DIM 4 CSN 5 VIN www.pingjingsemi.com Revision: 2.0 Apr-2022 Description Drain of the internal NMOS Ground PWM/Analog Diming Input. Internal weak pull up. Drive DIM low to turn off the output Connect sensor input reference to VIN for measure output current. Power input 2/9 PJL4115SR High Brightness Step-Down LED Driver Block Diagram Regulator UVLO 180mV 220mV Logic Driver Thermal Regulator Analog/PWM Diming Absolute Maximum Ratings (at TA = 25°C) Parameter Value Unit VIN,CSN to GND -0.3 ~ +36 V SW to GND -0.3 ~ +36 V DIM to GND -0.3 ~ +6.5 V RθJA 45 °C/W TJ -40 ~ +150 °C TSTG -55 ~ +150 °C Junction to Ambient Thermal Resistance Operation Junction temperature range Storage temperature range www.pingjingsemi.com Revision: 2.0 Apr-2022 3/9 PJL4115SR High Brightness Step-Down LED Driver Electrical Characteristics TJ = 25°C, VIN = 12V, unless otherwise noted Parameter Input Voltage Symbol Test Conditions VIN Min. Typ. Max. Unit 6 -- 30 V VCC UVLO Threshold VUVLOTH VCC Rising -- 5.5 -- V VCC UVLO Hysteresis VUVLOHYS VCC Falling -- 0.5 -- V IQ No Switching -- 270 -- μA VCS VIN-CSN 194 200 206 mV VCS_HY -- 15 -- % ICSN -- 3 -- μA VDIM_F -- 3.8 -- V Quiescent Supply Current Current Sense Voltage Current Sense Threshold CSN Input Current DIM Floating Voltage IDIM VDIM=5V -- 27 -- μA DIM Pull Up Current IDIM_PU VDIM=0V -- -25 -- μA DIM Input High VDIM_H 2.5 -- -- V DIM Input Low VDIM_L -- -- 0.3 V 0.5 -- 2.5 V FPWMmin -- 0.1 -- KHz FPWMmax -- 20 -- KHz FMAX -- 1 -- MHz RDS(ON) -- 240 -- mΩ -- 105 -- °C -- 160 -- °C DIM Input Leakage Current DIM Voltage Range Min. Recommended PWM Dimming Frequency Max. Recommended PWM Dimming Frequency Max. Switch Frequency MOSFET ON Resistance VDIM Thermal Regulate TREG Thermal Shutdown TSH www.pingjingsemi.com Revision: 2.0 Apr-2022 VDIM Rising Temp Rising 4/9 PJL4115SR High Brightness Step-Down LED Driver Typical Characteristic Curves TA = 25°C, VIN =24V, RCS=0.3Ω, unless otherwise noted Iout Output Current (A) 100 Efficiency(%) 95 90 85 80 75 70 1LEDs 65 2LEDs 60 6LEDs 0 10 20 Vin Input Votage (V) 1.2 1 0.8 0.6 0.4 0 30 Rcs=0.3Ω Rcs=0.5Ω Rcs=0.2Ω 0.2 6 10 14 18 22 26 30 Vin Input Votage (V) Power ON Power OFF (Vin=24V,L=33uH, 4LEDs) (Vin=24V,L=33uH, 4LEDs) CH2:Vin 10V/div CH2:Vin 10V/div CH3:Vsw 10V/div CH3:Vsw 10V/div CH4:Iout 500mA/div CH4:Iout 500mA/div Operation waveform (Vin=12V, L=33uH, 4LEDs) Operation waveform (Vin=24V, L=33uH, 4LEDs) CH4:Iout 500mA/div CH4:Iout 500mA/div CH3:Vsw 5V/div CH3:Vsw 10V/div www.pingjingsemi.com Revision: 2.0 Apr-2022 5/9 PJL4115SR High Brightness Step-Down LED Driver PWM Dimming (Vin=24V, L=33uH, Iout=1A, 4LEDs) CH1:PWM F=100Hz D=1% 5V/div PWM Dimming (Vin=24V, L=33uH, Iout=1A, 4LEDs) CH1:PWM F=100Hz D=99% 5V/div CH4:Iout 500mA/div CH4:Iout 500mA/div CH3:Vsw 10V/div CH3:Vsw 10V/div PWM Dimming (Vin=24V, L=33uH, Iout=1A, 4LEDs) PWM Dimming (Vin=24V, L=33uH, Iout=1A, 4LEDs) CH1:PWM F=5KHz D=20%5V/div CH1:PWM F=5KHz D=80% 5V/div CH4:Iout 500mA/div CH4:Iout 500mA/div CH3:Vsw 10V/div CH3:Vsw 10V/div www.pingjingsemi.com Revision: 2.0 Apr-2022 6/9 PJL4115SR High Brightness Step-Down LED Driver Operation Steady State The PJL4115SR is a step-down LED-current convertor that is easily configured for a wide input that ranges from 6V to 30V input. The PJL4115SR uses a High-side current-sense resistor to detect and regulate LED current. The average voltage across the current- sense resistor is measured and regulated in the 200mV range. The internal 1.2V reference voltage provides a 0.5V reference to enable the part. When VDIM>0.5V, the output of the comparator goes high and enables the other blocks. While the internal DIM pin weak pull up to 3V Dimming Control The PJL4115SR allows the DIM pin to control both Analog and PWM dimming. Whenever the voltage on DIM is less than 0.3V, the chip turns off. For analog dimming, when the voltage on DIM is from 0.5V to 2.5V, the LED current will change from 0% to 100% of the maximum LED current. If the voltage on DIM pin is higher than 2.5V, output LED current will equal the maximum LED current. For PWM dimming, the signal amplitude must exceed 2.5V. Choose a PWM frequency in range of 100Hz to 20kHz for good dimming linearity. www.pingjingsemi.com Revision: 2.0 Apr-2022 7/9 PJL4115SR High Brightness Step-Down LED Driver Applications Information Setting the LED Current The LED current is identical and set by the current sense resistor between the CS pin and GND pin. RSENSE=200mV / ILED For RSENSE=0.2Ω, the LED current is set to 1A Selecting the Inductor Lower value of inductance can result in a higher switching frequency, which causes a larger switching loss. Choose a switch frequency between 100kHz to 500kHz for most application. According to switching frequency, inductor value can be estimated as L (1 VOUT / VIN )  VOUT 0.3  ILED  fSW For higher efficiency, choose an inductor with a DC resistance as small as possible. Selecting the Input Capacitor The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. Choose a capacitor of 100uF for most applications. The voltage rating should be greater than the input voltage. Use a low ESR capacitor for input decoupling. Layout Consideration Pay careful attention to the PCB layout and component placement. RSENSE should be placed close to the CS pin and GND pin in order to minimize current sense error. The input loop— including input capacitor, Schottky diode, and MOSFET—should be as short as possible. www.pingjingsemi.com Revision: 2.0 Apr-2022 8/9 PJL4115SR High Brightness Step-Down LED Driver Package Outline SOT-89-5 Dimensions in mm Ordering Information Device Package PJL4115SR SOT-89 www.pingjingsemi.com Revision: 2.0 Apr-2022 Shipping 1,000PCS/Reel&7inches 3,000PCS/Reel&13inches 9/9