FP7208AXR-G1

FP7208 Non-Synchronous PWM Boost Controller for LED Driver General Description The FP7208 is boost topology switching regulator for LED driver. It provides built-in gate driver pin for driving external N-MOSFET. The non-inverting input of error amplifier connects to a 0.2V reference voltage. It has programmable soft start time set by external capacitor, and over voltage protection set by external resistor. The LED current can be adjusted by an external signal connecting to the EN pin. EN pin accepts either a DC voltage or a PWM signal. The PWM signal filter components are contained within the chip. 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 VLED VIN EXT VDS HVDD EN FP7208 COMP FB OVP SS VIN 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 1/13 FP7208 Function Block Diagram COMP GND SS HVDD UVLO Soft Start Error Amp. LDO FB VDDI = 3.5V Max. LDO VDS = 8.5V VDS 0.2V PWM Comp. DIM EN VRAMP Shutdown Circuit Control and Driver Logic Oscillator 300KHz OVP EXT Level = 0.7V OVP Pin Descriptions SOP-8L (EP) Top View 1 8 EXT EN 2 7 HVDD COMP 3 6 OVP FB 4 5 SS FP7208 XXx-XXL VDS Bottom View EP (GND) Name No. I/O VDS 1 P EN 2 I Description Power Supply for Internal Control Circuits and Gate Drivers 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 GND 9 P Gate Driver Output 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 2/13 FP7208 Marking Information SOP-8L(EP) FP7208 XXx - XXL Halogen Free Lot Number Internal ID Per - Half Month Year 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 3/13 FP7208 Ordering Information Part Number Operating Temperature Package MOQ Description -25°C ~ 85°C SOP-8L(EP) 2500EA Tape & Reel FP7208XR-G1 Absolute Maximum Ratings Symbol Conditions Min. Typ. Max. Unit HVDD - 0 - 25 V VDS,EXT Voltage - - 0 - 16 V Others Pin Voltage - - 0 - 6 V Parameter Supply Voltage 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 - (soldering, 10 sec) - - +260 °C Lead Temperature 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 4/13 FP7208 Recommended Operating Conditions Parameter Symbol Conditions Min. Typ. Max. Unit HVDD - 4.5 - 24 V TA Ambient Temperature -25 - +85 °C Supply Voltage Operating Temperature Range DC Electrical Characteristics (HVDD=12V, TA=25°C, unless otherwise specified) Symbol Conditions Min. Start-up Voltage HVDD - 2.5 Input Supply Range HVDD - 4.5 - 24 V Under Voltage Lockout VUVLO - - 2.2 - V - Parameter Typ. Max. Unit System Supply Input 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 Operation Frequency fOSC FB=0V 250 300 350 KHZ Maximum Duty Ratio % FB=0V - 90 - % ISS Vss=0V - 1.5 - µA VFB Connect EN to VDS with a 100kΩ, EN≒3V 0.191 0.200 0.209 V Enable Voltage VEN - 0.20 0.25 0.30 V Shutdown Voltage VEN - - - 0.07 V Oscillator Soft Start Soft-Start bias Current Reference Voltage Feedback Voltage Enable Control 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 Thermal Shutdown Thermal Shutdown Threshold VOVP - 0.65 0.70 0.75 V 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 5/13 FP7208 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 6/13 FP7208 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 7/13 FP7208 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 ground to shutdown 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 is from 0.25V to 2.25V. The maximum feedback voltage is 0.2V. The LED current (ILED) can be calculated using formula below. VFB  V VEN  0.25V ILED  FB RS 10 ， PWM Dimming Control The PWM signal is connected to EN pin adjust duty cycle to change feedback voltage (VFB). 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. The LED current (ILED) can be calculated using formula below. VFB  V VPWM  Duty  0.25V ILED  FB RS 10 ， 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 8/13 FP7208 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 turned off when OVP pin voltage exceeds 0.7V. The voltage (VOVP) can be calculated using formula below, and circuit is shown as below. VOVP  R3   0.7V 1    R4  LED+ R3 OVP R4 Application Information Inductor Selection 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 temperature 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: ILED  VFB RS 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 9/13 FP7208 Input Current Limit Setting The SS voltage is adjusted using a resistive voltage divider connected 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. Voltage SS 3.6V SS Voltage Drop EXT Duty Limit OSC 1.5V VIN D3 1N4148 SS R8 OSC 0.5V Time Voltage SS EXT R9 Time 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 10/13 FP7208 Layout Considerations 1. The power traces, consisting of the GND trace, the MOS drain trace and the VIN 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 Q2, C1, C2, C12 and C13 should 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. L1 D1 VIN C1 C2 Q2 C3 Via to Control 1 VDS 2 EN EXT 8 HVDD 7 FP7208 C4 3 COMP 4 FB C12 Via to VIN C8 R3 OVP 6 SS 5 R4 C6 GND R7 C13 Via to VLED Via to GND Via to GND Via to SS GND D3 R9 RS R8 Via to VIN VLED Via to GND 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 11/13 FP7208 Application Information Q2 AP83T03GMT C2 22μF EXT VDS R3 100K R13 C3 1μF C1 22μF VLED 12V Max. 2A D1 SVM1545LB L1 4.7μH VIN 3V~4.2V C12 100μF C15 C13 10μF R4 4.99K C8 0.1μF RS 0.1Ω HVDD EN C4 0.1uF FP7208 OVP COMP R8 36K FB SS GND R7 10K R9 30K Q2 AP83T03GMT C3 1μF C2 0.1μF EXT VDS VLED 18V Max. 2A D1 SVM1045V2 L1 10μH VIN 6V~8.4V C1 100μF VIN D3 1N4148 C6 0.1μF R3 130K R13 C12 100μF C15 C13 10μF R4 4.3K C8 0.1μF RS 0.1Ω HVDD EN C4 0.1uF FP7208 OVP COMP R8 62K FB SS GND R7 10K R9 20K D1 SVM1045V2 L1 15μH VIN 12V Q2 AP0504GMT C3 1μF C1 100μF C2 0.1μF EXT VDS R6 100K VLED 24V/2A R3 120K R13 C12 100μF C15 C13 0.1μF R4 3K C8 0.1μF RS 0.1Ω HVDD EN C4 0.1uF FP7208 COMP OVP R8 62K FB R7 10K VIN D3 1N4148 C6 0.1μF SS GND C6 0.1μF VIN D3 1N4148 R9 8.2K Note: 1. 2. The X5R and X7R of ceramic capacitors are recommended to choose. 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 12/13 FP7208 Package Outline SOP-8L (EP) UNIT: mm 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 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. 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. Website: http://www.feeling-tech.com.tw Rev. 0.64 13/13