FP7102XR-LF

FP7102 28V, 2A Buck Constant Current Switching Regulator for White LED General Description The FP7102 is a PWM control buck converter designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.25V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. The FP7102 includes a high current P-MOSFET to realize high efficiency and excellent transient characteristics. The PWM control circuit is able to change the duty ratio linearly from 0 up to 100%. Other features include user accessible EN pin for enabling, thermal shutdown, cycle-by-cycle current limit and over current protection. Features        Wide Supply Voltage Operating Range: 3.6 to 28V Built-in P-MOSFET for 2A Loading Capability Precision Feedback Reference Voltage: 0.25V (2%) Low Current Consumption: 4mA Internal Fixed Oscillator Frequency: 320KHz (Typ.) Internal Soft-Start Function (SS) Over Current Protection  Package: SOP-8L &SOP-8L(EP) Typical Application Circuit VIN LX V CC LX FP 7102 ON/OFF EN FB COMP GND GND 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. 0.93 Website: http://www.feeling-tech.com.tw 1/12 FP7102 Function Block Diagram EN VCC Enable Control Reference Regulator Oscillator 2.50V Over Current Protection 36K FB 0. 25V Output Drive Control Circuits 500 COMP Thermal Shutdown Internal Soft Start Circuit GND GND LX LX 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. 0.93 Website: http://www.feeling-tech.com.tw 2/12 FP7102 Pin Descriptions SOP- 8L Name No. I / O Description FP7102 9Fa-86L FB 1 I Error Amplifier Inverting Input EN 2 I Enable Control COMP 3 O Error Amplifier Compensation Output VCC 4 P IC Power Supply (PMOS Source) LX 5 P PMOS High Current Output LX 6 P PMOS High Current Output GND 7 O IC Ground GND 8 O IC Ground SOP- 8L (EP) Top View FB 1 COMP 3 VCC 4 FP7102 2 9Fa-86L EN 8 GND Name No. I / O Description FB 1 I Error Amplifier Inverting Input 7 GND EN 2 I Enable Control 6 LX COMP 3 O Error Amplifier Compensation Output 5 LX VCC 4 P IC Power Supply (PMOS Source) LX 5 P PMOS High Current Output LX 6 P PMOS High Current Output GND 7 O IC Ground GND 8 O IC Ground EP 9 P Exposed PAD. Must connect to LX Bottom View EP 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. 0.93 Website: http://www.feeling-tech.com.tw 3/12 FP7102 Marking Information SOP- 8L & SOP-8L (EP) 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: January → A (Front Half Month), B (Last Half Month) February → C (Front Half Month), D (Last Half Month) 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. 0.93 Website: http://www.feeling-tech.com.tw 4/12 FP7102 Ordering Information Part Number Operating Temperature Package MOQ Description FP7102DR-LF -25°C ~ +85°C SOP-8L 2500EA Tape & Reel FP7102XR-LF -25°C ~ +85°C SOP-8L (EP) 2500EA Tape & Reel Absolute Maximum Ratings Parameter Max. Unit 28 V 2 A +1.2 V 650 mW θJA +175 ℃/W θJC +45 ℃/W Symbol Power Supply Voltage Conditions Min. Typ. VIN Output Source Current Error Amplifier Inverting Input -0.3 TA≦+25℃ Allowable Dissipation Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case ESD Susceptibility HBM (Human Body Mode) MM (Machine Mode) Storage Temperature Lead Temperature (soldering, 10 sec) -55 2 KV 200 V +125 ℃ +260 ℃ 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. 0.93 Website: http://www.feeling-tech.com.tw 5/12 FP7102 Recommended Operating Conditions Parameter Symbol Supply Voltage Conditions VIN Operating Temperature Min. Max. Unit 3.6 Typ. 28 V -25 85 ℃ DC Electrical Characteristics (VCC=6V, TA= 25℃, unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Unit 0.245 0.25 0.255 V mV Reference Output Voltage VREF FB connected to COMP Input Regulation △VREF VCC＝3.6 V to 25 V 2 12.5 Output Voltage Change with Temperature △VREF / TA＝-25℃ to 25℃ VREF TA＝ 25℃ to 85℃ 1 2 1 2 % Oscillator Section Oscillation Frequency f 320 KHz Frequency Change with Voltage Δf / ΔV VCC=3.6V to 25V 5 % Frequency Change with Temperature Δf / ΔT TA = -25℃ to +85℃ 5 % Error Amplifier Section Input Bias Current IB Voltage Gain Av Frequency Bandwidth BW Output Voltage Swing Positive VPOS Output Voltage Swing Negative VNEG Output Source Current -1.0 Av=0 dB 1.7 ISINK Vcomp=200mV 1.0 μA 100 V/V 6 MHz 2 V 0.1 ISOURCE Vcomp=200mV Output Sink Current -0.2 0.2 V -15 -30 μA 15 30 μA 100 % -20 V -2 A Idle Period Adjustment Section Maximum Duty Cycle TDUTY VFB =0.2V Output Section PMOS D-S Voltage VDSS PMOS Source Current ID PMOS On Resistance RDS (ON) Output Leakage Current VCOMP=0.1V VCC=5.0V, V FB=0V 70 150 VCC=10V, V FB=0V 42 90 IL mΩ 5 μA 150 ℃ 3 A Thermal Shutdown Section Thermal shutdown Temperature Over Current Protection Section PMOS OCP Current IOCP 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. 0.93 Website: http://www.feeling-tech.com.tw 6/12 FP7102 Parameter Symbol Conditions IEN EN pin Open Min. Typ. Max. Unit 20 μA Total Device Section EN Input Current Upper Threshold Voltage (EN) VUPPER 1.12 V Lower Threshold Voltage (EN) VLOW 0.87 V Hysteresis VHYS 250 mV Average Supply Current IAVE 4 ISHUTDOWN 15 VCC Shutdown 210 6 mA 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. 0.93 Website: http://www.feeling-tech.com.tw 7/12 FP7102 Detailed Description Voltage Reference A built-in 2.5V reference regulator supplies FP7102 internal circuits. Also, this 2.5V reference voltage is divided down by an internal resistive divider to provide a 0.25V precision reference voltage to the error amplifier non-inverting terminal. Setting the LED Current FP7102 is a constant current buck regulator. The LEDs are connected between VOUT and FB pin as shown in the Typical Application Circuit section. The FB pin is 0.25V in regulation. Therefore, the LEDs current IF is set by VFB and the resistor R2 connected between FB and ground by the following equation: IF  VFB R2 IF should not exceed the 2A current capability of FP7102 and therefore R2 minimum value must be approximately 0.13Ω. Output Voltage The output voltage is primarily determined by the number of LEDs(n) connected between VOUT and FB pin. Therefore, VOUT can be written as: VOUT  ((n  VF )  VFB ) Where VF is the forward voltage of one LED at the set LED current level (see LED manufacturer datasheet for forward characteristics curve) Oscillator The fixed PWM frequency is generated by an internal oscillator. Its typical values are 320KHz. Thermal Protection The thermal protection is triggered when junction temperature is higher than 150℃ that may occurs by an abnormal heavy current loading. When this happens, the FP7102 turns output off. Once the junction temperature is cooled down to lower than 130℃, FP7102 starts again and turns the power switch on. 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. 0.93 Website: http://www.feeling-tech.com.tw 8/12 FP7102 Over Current Protection The FP7102 uses cycle-by-cycle current limit to protect the internal power switch. During each switching cycle, a current limit comparator detects if the power switch current exceeds the internal setting current. If it does, over current protection function decrease the oscillator frequency to prevent thermal issue. 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. 0.93 Website: http://www.feeling-tech.com.tw 9/12 FP7102 Typical Application FP7102 1W / 3W LED for DC Input Circuit Dimming Control Circuit Changing the duty cycle of PWM signal can get different LED current. The PWM signal is recommended above 10kHz. The application circuit is shown in the following. The LED current can be calculated by the following equation: ILED  VFB  R4  ( VPWM  Duty  VFB ) R3  R5 R2 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. 0.93 Website: http://www.feeling-tech.com.tw 10/12 FP7102 Package Outline SOP-8L UNIT: mm Symbols Min. (mm) Max. (mm) A 1.346 1.752 A1 0.101 0.254 A2 1.498 D 4.800 4.978 E 3.810 3.987 H 5.791 6.197 L 0.406 1.270 θ° 0° 8° Note: 1. Package dimensions are in compliance with JEDEC outline: MS-012 AC. 2. Dimension “D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E” does not include inter-lead flash or protrusions. 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. 0.93 Website: http://www.feeling-tech.com.tw 11/12 FP7102 SOP-8L (EP) UNIT: mm Symbols Min. (mm) Max. (mm) A 1.346 1.752 A1 0.050 0.152 A2 1.498 D 4.800 4.978 E 3.810 3.987 H 5.791 6.197 L 0.406 1.270 θ° 0° 8° Exposed PAD Dimensions: Symbols Min. (mm) Max. (mm) E1 2.184 REF D1 2.971 REF Note: 1. Package dimensions are in compliance with JEDEC outline: MO-178 AA. 2. Dimension ”D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E” does not include inter-lead flash or protrusions 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. 0.93 Website: http://www.feeling-tech.com.tw 12/12