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Technical content
Features
Start-up Voltage: 2.5V Wide Supply Voltage Operating Range: 4.5V to 24V Precision Feedback Reference Voltage: 0.2V (Max.) Analog and Digital Dimming Control Shutdown Current: 6μA (Max.) Internal Fixed Switching Frequency: 300KHz Programmable Soft Start Function (SS) Programmable Over Voltage Protection (OVP) Over Temperature Protection (OTP) Package: SOP-8L(EP)
Applications
LED Module Display Backlight Car Lighting Portable LED Lighting Typical Application Circuit FP7208 OVP EXT HVDDEN VDS VIN VLED COMP FB GND SS VIN
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 . Function Block Diagram PWM Comp. Error Amp. Control and Driver Logic Oscillator EXT UVLO EN 300KHz GND VRAMP LDO LDO HVDD VDS = 8.5VVDDI = 3.5V VDS FB DIM Max. 0.2V COMP SS Soft Start OVP OVP Level = 0.7V Shutdown Circuit Pin Descriptions SOP-8L (EP) EN HVDD SS Top View FB XXx-XXL FP7208 VDS COMP OVP EXT EP (GND) Bottom View Name No. I / O Description VDS 1 P Power Supply for Internal Control Circuits and Gate Drivers EN 2 I Enable and Dimming Control COMP 3 O Compensation FB 4 I Error Amplifier Inverting Input SS 5 I Soft Start Programming OVP 6 I Over Voltage Protection HVDD 7 P IC Power Supply EXT 8 O Gate Driver Output GND 9 P IC Ground (Exposed PAD) – Must Connect to Ground
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 . Marking Information SOP-8L(EP) Halogen Free Lot Number Internal ID Per - Half Month Year FP7208 XXx-XXL Halogen Free: Halogen free product indicator Lot Number: Wafer lot number’s last two digits For Example Lot : 123456 XXx-56L Internal ID: Internal Identification Code Per-Half Month: Production period indicator in half month time unit For Example : A → First Half Month of January B → Second Half Month of January C → First Half Month of February D → Second 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 .
Ordering Information
Part Number Operating Temperature Package MOQ Description FP7208XR-G1 -25°C ~ 85°C SOP-8L(EP) 2500EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage HVDD - 0 - 25 V VDS,EXT Voltage - - 0 - 16 V Others Pin Voltage - - 0 - 6 V Thermal Resistance (Junction to Ambient) θJA SOP-8L (EP) - - +60 °C / W Thermal Resistance (Junction to Case) θJC SOP-8L (EP) - - +10 °C / W Junction Temperature TJ - - - +150 °C Operating Temperature TOP - -25 - +85 °C Storage Temperature TST - -65 - +150 °C Lead Temperature - (soldering, 10 sec) - - +260 °C 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 . Recommended Operating Conditions Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage HVDD - 4.5 - 24 V Operating Temperature Range TA Ambient Temperature -25 - +85 °C Parameter Symbol Conditions Min. Typ. Max. Unit System Supply Input Start-up Voltage HVDD - 2.5 V Input Supply Range HVDD - 4.5 - 24 V Under Voltage Lockout VUVLO - - 2.2 - V UVLO Hysteresis - - - 0.1 - V Average Current ICC FB=0V, Switching - 5 - mA Quiescent Current ICC FB=0.55V, No Switching - 245 - µA Shutdown Current ICC VEN=GND - - 6 µA Input Supply Voltage VDS HVDD=12V, IDS=0A - 8.5 - V Oscillator Operation Frequency fOSC FB=0V 250 300 350 KHZ Maximum Duty Ratio % FB=0V - 90 - % Soft Start Soft-Start bias Current ISS Vss=0V - 1.5 - µA Reference Voltage Feedback Voltage VFB Connect EN to VDS with a 100kΩ, EN≒3V 0.191 0.200 0.209 V Enable Control Enable Voltage VEN - 0.20 0.25 0.30 V Shutdown Voltage VEN - - - 0.07 V External Transistor Connection current EXT Pull-UP Resistance REXTH VDS=8.5V - 1 - Ω EXT Pull-Down Resistance REXTL VDS=8.5V - 1 - Ω Over Voltage Protection OVP Threshold VOVP - 0.65 0.70 0.75 V Thermal Shutdown Thermal Shutdown Threshold TTS - - +150 - °C
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 . Typical Operating Characteristics (VIN=12V, TA=25℃, unless otherwise specified)
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 .
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 . Function Description Operation The FP7208 is voltage mode boost controller for LED driver. It operates with pulse width modulation (PWM), and changes to PSM mode when output is light load. The internal resistive divider provides 0.2V reference for the error amplifier , which can reduce the power dissipation in the current sense resistor. Soft Start Function Soft start time is programmable to connect capacitor between SS pin to ground. After the IC is enabled, the output of error amplifier is clamped by the internal soft-start function, which causes PWM pulse width increasing slowly and thus reducing input surge current during power on. The soft start bias current is 1.5µA. Enable Mode / Shutdown Mode Drive the EN pin to grou nd to shutdow n the IC. Shutdown mode forces to turn off all internal circuitry, and reduces the HVDD supply current to 6uA (max). EN pin rising threshold is 0. 25V. DC Dimming Control The DC voltage is connected to EN pin adjust the voltage to change feedback voltage (VFB). EN internal voltage is clamped in 2.25V (VEN) when external voltage exceeds 2.25V. The valid EN voltage calculated using formula below. 0.25VVV EN FB S FB LED R VI PWM Dimming Control The PWM signal is connected to EN pin adjust duty cycle to change feedback voltage (V FB). EN internal voltage is clamped in 2.25V (VPWM) when external PWM voltage exceeds 2.25V, and internal filter regulates PWM signal become a DC voltage. The DC voltage is valid from 0. 25V to 2.25V. The PWM signal is recommended above 10KHz. T he LED current (I LED) can be calculated using formula below. 0.25VDutyVV PWM FB S FB LED R VI
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 . OVP LED+ FB Voltage Setting How to set FB voltage when LEDs don’t need dimming control. The resistor 100KΩ is connected between VDS and EN, which cause EN voltage more than 2.25V. The FB voltage is constant 0.2V. Over Voltage Protection The gate driver signal is turn ed off when OVP pin voltage exceeds 0.7V. The voltage (VOVP) can be calculated using formula below, and circuit is shown as below. R310.7VVOVP
Application Information
Inductance value is decided based on different condition. 4.7µH to 68uH inductance value is recommended for general application circuit. There are three important inductor specifications, DC resistance, saturation current and core loss. Low DC resistance has better power efficiency. Capacitor Selection The output capacitor is required to maintain the DC voltage during switching . Low ESR capacitors are preferred to reduce the output voltage ripple. Ceramic capacitor of X5R and X7R are recommended, which have low equivalent series resistance (ESR) and wider operation temperatu re range. Diode Selection Schottky diodes with fast recovery times and low forward voltages are recommended. Ensure the diode average and peak current rating exceed the average output current and peak inductor current. In addition, the diode’s reverse breakdown voltage must exceed the output voltage. LED Current Programming The LED current is set by a resistor from the FB pin to ground. The LED current is: S FB LED R VI
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 . Input Current Limit Setting The SS voltage is adjusted u sing a resistive voltage divider connect ed from input voltage to D3 cathode, D3 Anode connects to SS pin. The input occur inrush current to cause input voltage drop off then SS voltage also drop less than 1.5V, PWM duty of EXT pin can be limited, which reduces inrush current to protect switching MOSFET. The level of internal oscillator is from 0.5V to 1.5V. D3 is unconnected the SS voltage is 3.6V. The circuit and detailed figure are shown as below. 1N4148 SS VIN OSC 0.5V OSC 1.5V SS 3.6V SS SS Voltage Drop EXT Duty Limit Voltage Time Time Voltage EXT
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 . Layout Considerations 1. The power traces, consisting o f the GND trace, the MOS drain trace and the V IN trace should be kept short, direct and wide. 2. Layout switching node MOS drain, inductor and schottky diode connection traces wide and short to reduce EMI. 3. Place C8 nearby HVDD pin as closely as possible to maintain input voltage steady and filter noise. 4. The sense resistor RS must be connected to FB pin directly and as closely as possible. 5. FB is a sensitive node. Please keep it away from switching node, MOS drain. 6. The GND of the Q 2, C1, C2, C12 and C13 sh ould be connected close and together directly to a ground plane. 7. The output capacitor C12 and C13 should be connected close and together directly to the ground of Q2. VLED GND 4 5 VIN Via to VIN Via to GND C13C12 RS C3C2C1 FP7208 EXT HVDDEN VDS COMP FB GND SS OVP C6 Via to GND Via to VLED Via to GND Via to Control Via to SS Via to VIN R8R9 D3R7 Suggested Layout
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 . VIN 3V~4.2V VLED 12V Max. 2A COMP FB GND SS 22μF 22μF 1μF 0.1uF 4.7μH AP83T03GMT SVM1545LB 100K 4.99K C12 100μF C13 10μF RS 0.1μF 0.1μF 0.1Ω R13 C15 VIN 1N4148 36K 30K 10K FP7208 OVP EXT HVDDEN VDS VIN 6V~8.4V VLED 18V Max. 2A COMP FB GND SS 0.1μF 1μF 0.1uF 10μH AP83T03GMT SVM1045V2 130K 4.3K C12 100μF C13 10μF RS 0.1μF 0.1Ω R13 C15C1 100μF 0.1μF 1N4148 62K 20K VIN 10K AP0504GMT 15μH FP7208 OVP EXT HVDDEN VDS VIN 12V VLED 24V/2A COMP FB GND SS 100μF 0.1μF 1μF 0.1uF SVM1045V2 120K C12 100μF C13 0.1μF RS 0.1μF 0.1Ω R13 C15 100K 0.1μF VIN 1N4148 62K 8.2K 10K Note: 1. The X5R and X7R of ceramic capacitors are recommended to choose. 2. R13 and C15 are added for reducing EMI (Electromagnetic Interference).
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 . Package Outline SOP-8L (EP) UNIT: mm Exposed PAD Dimensions: Note: 1. Package dimensions are in compliance with JEDEC outline: MS-012 AA. 2. Dimension ”D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E” does not include inter -lead flash or protrusions. Symbols Min. (mm) Max. (mm) A 1.30 1.70 A1 0 0.15 A2 1.25 1.55 D 4.70 5.10 E 3.80 4.00 H 5.80 6.20 L 0.40 1.27 Symbols Min. (mm) Max. (mm) D1 2.60 3.45 E1 1.90 2.56