FP7152AR-G1

FP7152 1A LED Driver with Internal Switch General Description The FP7152 is a continuous current mode inductive step down converter. It can drive single or multiple series connected LEDs. The FP7152 includes the output switch and a high-side output current sensing circuit, which use an external resistor to set the average output current. Output current can also be adjusted by applying an external signal to the ‘ADJ’ pin. The ADJ pin accept either a DC voltage or a PWM dimming waveform. The PWM dimming filter components are contained within the chip. Applying a voltage under 0.2V to the ADJ pin will turn off the output. The FP7152 is available in the SOT89-5L package, Its space-saving footprint occupys small PCB area for miscellaneous application fields. Features          1A Output Current Internal 0.5Ω 26V Power MOSFET Switch Wide 7 to 26V Operating Input Range 20μA Shutdown Mode Current Typical 4% Output Current Accuracy Signal pin ON / OFF and Brightness Control Adjustable Soft-Start Up to 95% Efficiency Up to 1MHz Switching Frequency  Internal Dimming Filter  Package: SOT89-5L Applications  Low Voltage Halogen replacement LEDs  LED back-up lighting Typical Application Circuit RS VIN CIN L SD ADJ VIN GND ISENSE LX FP7152 This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 1/14 FP7152 Function Block Diagram Pin Descriptions SOT89-5L Name No. I/O Description LX 1 O Power Switch Output GND 2 P ADJ 3 I ISENSE 4 I IC Ground Multi Function ON / OFF& Brightness Control Current Sense Resistor Connected VIN 5 P IC Power Supply This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 2/14 FP7152 Marking Information SOT89-5L Halogen Free: Halogen free product indicator Lot Number: Wafer lot number’s last two digits For Example: 132386TB  86 Internal ID: Internal Identification Code Per-Half Month: Production period indicated in half month time unit For Example: A → First Half Month of January B → Last Half Month of January C → First Half Month of February D → Last Half Month of February Year: Production year’s last digit This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 3/14 FP7152 Ordering Information Part Number Operating Temperature Package MOQ Description -40℃ ~ 85℃ SOT89-5L 1000EA Tape & Reel FP7152AR-G1 Absolute Maximum Ratings Parameter Symbol Supply Voltage ISENSE Voltage Conditions VIN VSENSE Measured with Respect to VIN Min. Typ. Max. Unit -0.3 26 V +0.3 -5 V LX Input Voltage VLX -0.3 26 V Adjust Pin Input Voltage VADJ -0.3 6 V Power Dissipation PD SOT89-5L @TA=25℃ 800 mW Thermal Resistance (Note1) θJA SOT89-5L +156 ℃ /W Junction Temperature TJ +150 ℃ Operating Temperature TOP -40 +85 ℃ Storage Temperature TST -65 +150 ℃ +260 ℃ Lead Temperature (soldering, 10 sec) Note1: θJA is measured in the natural convection at TA=25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. IR Re-flow Soldering Curve This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 4/14 FP7152 DC Electrical Characteristics VIN=12V, TA=25℃ Parameter Symbol Input voltage Internal Regulator Start-up Threshold VSU IINQoff with Output off Quiescent Supply Current IINQon with Output Switching Min. Typ. 7 Max. Unit 26 V VIN Rising 4.8 ADJ pin Grounded 15 20 µA 400 800 µA 100 105 mV 3 10 µA 1.25 1.29 V ADJ pin Floating f=250kHz V Measured on ISENSE pin Mean Current Sense Threshold VSENSE with Respect to V IN Voltage (Defines LED Current Setting Accuracy) 95 VADJ =1.25V VSENSEHYS ISENSE Pin Input Current ISENSE Internal Reference Voltage VREF Temperature Coefficient of VREF External Control Voltage Range on ADJ Pin for DC Brightness Control (1) ADJ Pin Enable High Voltage Conditions VIN Quiescent Supply Current Sense Threshold Hysteresis (unless otherwise specified) ±15 VSENSE =VIN -0.1 Measured on ADJ pin with pin Floating 1.21 50 △VREF / △T ADJ Pin Enable Hysteresis Resistance Between ADJ Pin and VREF Continuous LX Switch Current % VADJ 0.3 ppm/℃ 2.5 V VADJ_ON VADJ Rising 0.2 0.25 0.3 V VADJ_HYS VADJ Falling 20 50 80 mV 250 kΩ RADJ 135 ILXmean 1.0 1.2 A LX Switch ‘On’ Resistance RLX 0.5 0.7 Ω LX Switch Leakage Current ILX (leak) 1 µA This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 5/14 FP7152 DC Electrical Characteristics (Cont.) VIN=12V, TA=25℃ Parameter Symbol Duty Cycle Range of PWM Signal PWM Frequency 10kHz DPWM (HF) PWM Amplitude= V REF Typ. 0.01 Measured on ADJ pin Duty Cycle Range of PWM Signal Applied to ADJ Pin During High Conditions (unless otherwise specified) Max. Unit 1 100:1 0.16 Measured on ADJ Pin 1 5 :1 Time Taken for Output Current to Reach 90% of Soft Start Time TSS Final Value after Voltage 500 µs 250 KHz on ADJ pin Has Risen Above 0.3V ADJ Pin Floating Operating Frequency fLX L=100μH (0.82Ω) IOUT=700mA @ VLED=3.4V Driving 1 LED LX switch ‘ON’ Minimum Switch ‘ON’ Time TONmin Minimum Switch ‘OFF’ Time TOFFmin LX switch ‘OFF’ Recommended Maximum Operating Frequency Recommended Duty Cycle Range of Output Switch at fLx max Internal Comparator Propagation Delay 200 ns 200 ns fLXmax 1 DLX 0.3 0.7 50 TPD MHz ns Notes： 1. 100% brightness corresponds to VADJ = VADJ (nom) = VREF. Driving the ADJ pin above VREF will increase the VSENSE threshold and output current proportionally. This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 6/14 FP7152 Typical Operating Characteristics (VCC=12V,Single LED,TA= 25°C,L=100uH, unless otherwise noted) Input Voltage vs. Vsense Voltage Input Voltage vs. Vsense Voltage 102 5 4 3 Vsense(%) Vsense(V) 100 98 96 2 1 0 ILED=1A 94 5 10 15 20 25 -1 5 10 15 Input Voltage vs. ILED Temperature vs. ILED 1.1 1 1.05 0.98 1 ILED(A) ILED(A) 30 Input Voltage(V) 1.02 0.96 0.94 0.95 0.9 0.92 0.85 L=47uH 0.9 5 10 15 20 25 0.8 30 -40 Input Voltage(V) -20 Vadj vs. ILED L=47uH , Rs=0.22ohm 0 20 40 Temperature(℃) 60 80 Vadj vs. ILED L=100uH , Rs=0.22ohm 1000 900 900 800 800 700 700 ILED(mA) 1000 ILED(mA) 25 -2 30 Input Voltage(V) 600 500 400 600 500 400 300 300 200 Set Curremt 200 Set Current 100 Actual Current 100 Actual Current 0 0 0 0.5 1 1.5 2 2.5 3 0 0.5 1 Vadj(V) 1.5 2 2.5 3 Vadj(V) Vadj vs. Vsense ERR Rs vs. ILED 5 1.2 1 0 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4 0.8 -5 ILED(A) Vsense ERR(%) 20 -10 0.6 0.4 -15 0.2 Suggestion: 0.3V≤Vadj≤2.5V 0 -20 0.1 Vadj(V) 0.2 0.3 0.4 0.5 0.6 RS(Ω) 0.7 0.8 0.9 1 This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 7/14 FP7152 Function Description Operation The FP7152 is a continuous mode inductive step-down converter that is easy to be configured in varies applications ranging from 7V~26V input. The converter employs a high side current sensing resistor RS to detect and regulate the LED current. The voltage across the current sensing resistor is kept measured and regulated in 100mV±15mV range. The internal 1.25V reference voltage is utilized to provide a 0.25V reference for enabling the part and a 1.25V pulling-up voltage as current reference voltage. When VADJ>0.25V the output of the comparator becomes high and the other blocks are enabled. When input voltage VIN is first applied, the initial current in L1 and RS is zero and there is no output from the current sense circuit. Under this condition, the output of comparator is high. This turns on an internal switch and switches the SW pin low, causing current to flow from VIN to ground, via RS, L1 and the LED(s). The current rises at a rate determined by VIN and L1 to produce a voltage ramp across RS. When (VIN - VSENSE) > 115mV, the output of the comparator switches low and turns the LX pin output to high impedance state. Then the current flowing on the RS decreases at another rate. When (VIN- VSENSE) < 85mV, the LX switch turns on again and the mean current on the LED is 100mV/RS. Adjusting output current The device contains a low pass filter between the ADJ pin and the threshold comparator. An internal current limiting resistor (250k nom.) is placed between ADJ and the internal reference voltage. This allows the ADJ pin to be overdriven with either DC or pulse signals to change the VSENSE switching threshold and adjust the output current. Output Shutdown The output of the low pass filter drives the shutdown circuit. When the input voltage to this circuit falls below the threshold (0.2V nom.), the internal regulator and the output switch are turned off. The voltage reference remains powered during shutdown to provide the bias current for the shutdown circuit. Quiescent supply current during shutdown is nominally 15uA and switch leakage is below 1uA. This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 8/14 FP7152 Dimming Control The FP7152 provides two dimming methods: PWM dimming and DC analog dimming. To use PWM dimming, apply a square wave to the EN/DIM pin. To used analog dimming, apply a 0.3V~2.5V DC voltage to this pin. This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 9/14 FP7152 Application Information Setting the LED Current The LED current is identical and set by the current setting resistor between the VIN pin and ISENSE pin. To set the LED current according to the following equation: ILED = 0.1 RS For RS=0.33Ω, the LED current is set to 300mA Shutdown Mode Taking the ADJ pin to a voltage below 0.2V will turn off the output and the supply current will fall to a low standby level of 15μA nominal. Soft Start The voltage on the ADJ pin is the inductor current reference. An external capacitor connected between the ADJ pin and ground provides a soft-start delay. When VIN starts, internal voltage source charges the capacitor from 0V to 1.25V to fulfill soft-start function. Capacitor selection A low ESR capacitor should be used for input decoupling. The ESR of this capacitor appears in series with the supply source impedance and lowers overall efficiency. This capacitor has to supply the relatively high peak current to the coil and smooth the current ripple on the input supply. A minimum value of 4.7uF is acceptable if the input source is close to the device, but higher values will improve performance at lower input voltages, especially when the source impedance is high. The input capacitor should be placed as close to the IC as possible. For maximum stability over temperature and voltage, capacitors with X7R, X5R, or better dielectric are recommended. Capacitors with Y5V dielectric are not suitable for decoupling in this application and should not be used. Reducing output ripple Peak to peak ripple current in the LED(s) can be reduced, if required, by shunting a capacitor CLED across the LED(s) Inductor selection Recommended inductor values for the FP7152 are in the range of 47uH to 100uH. Higher This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Rev. 0.64 Website: http://www.feeling-tech.com.tw 10/14 FP7152 inductance value is recommended at higher supply voltages in order to minimize errors due to switching delays, which result in increased ripple and lower efficiency. Higher values of inductance also result in a smaller change in output current over the supply voltage range. The inductor should be mounted as close to the device as possible with low resistance connections to the LX and VIN pins. The chosen coil should have a saturation current higher than the peak output current and a continuous current rating above the required mean output current. DC Dimming IOUTDC= 0.08*VADJ/RS (for 0.3< VADJ