FP7208XR-G1

FP7208/FP7208B Non-Synchronous PWM Boost Controller for LED Driver General Description The FP7208 and FP7208B are boost topology switching regulator for LED driver. They provide built-in gate driver pin for driving external N-MOSFET. The non-inverting input of error amplifier connects to a 0.1V default reference voltage. They have programmable soft start time set by external capacitors, and over voltage protection set by external resistors. FP7208B has programmable frequency set by external resistor. The LED current can be adjusted by applying an external signal to the EN pin. The EN pin accepts either a DC voltage or a PWM signal. The PWM signal filter components are contained within the chip. The FP7208B is available in the small footprint DFN-10L package to fit in space-saving PCB layout for application fields. Features
Wide Supply Voltage Operating Range: 2.5V to 24V
Precision Feedback Reference Voltage: 0.1V (±2%)
Analog and Digital Dimming Control
Shutdown Current: < 6µA
Internal Fixed PWM Frequency: 200KHz / FP7208
Programmable PWM Frequency: 100KHz~1000KHz / FP7208B
Programmable Soft Start Function (SS)
Programmable Over Voltage Protection (OVP)
Over Temperature Protection (OTP)
Package: SOP-8L(EP) / FP7208, DFN-10L / FP7208B Applications
LED Module
Display Backlight
Car Lighting
Portable LED Lighting FP7208/FP7208B Typical Application Circuit 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. 0.60 2/15 FP7208/FP7208B Function Block Diagram 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. 0.60 3/15 FP7208/FP7208B Pin Descriptions SOP-8L (EP) Name No. I/O FP7208 XXx-XXL EN 2 I Description Power Supply for Internal Control Circuits and Gate Drivers Enable and Dimming Control VDS 1 P 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 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 RT 7 I Frequency Programming HVDD 8 P IC Power Supply GND 9 P IC Ground EXT 10 O Gate Driver Output EP 11 P Exposed PAD – 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. 0.60 4/15 FP7208/FP7208B Marking Information SOP-8L(EP) DFN-10L 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. 0.60 5/15 FP7208/FP7208B Ordering Information Part Number Operating Temperature Package FP7208XR-G1 -25°C ~ 85°C SOP-8L(EP) FP7208BdR-G1 -25°C ~ 85°C DFN-10L MOQ Description 2500EA Tape & Reel 2500EA Tape & Reel Absolute Maximum Ratings Parameter Supply Voltage Symbol Conditions HVDD VDS,EXT Voltage Others Pin Voltage Min. Max. Unit 0 25 V 0 16 V 0 Thermal Resistance (Junction to Ambient) θJA Thermal Resistance (Junction to Case) θJC Junction Temperature TJ SOP-8L (EP) DFN-10L SOP-8L (EP) DFN-10L Typ. 6 V +60 +60 +10 +10 °C / W °C / W °C / W °C / W +150 °C Operating Temperature TOP -25 +85 °C Storage Temperature TST -65 +150 °C +260 °C Lead Temperature (soldering, 10 sec) 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. 0.60 6/15 FP7208/FP7208B Recommended Operating Conditions Parameter Symbol Supply Voltage Conditions HVDD Operating Temperature Range TA Ambient Temperature Min. Typ. Max. Unit 2.5 24 V -25 +85 °C DC Electrical Characteristics (HVDD=12V, TA=25°C , unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit 24 V System Supply Input Input Supply Range HVDD Under Voltage Lockout VUVLO 2.5 UVLO Hysteresis Average Current ICC FB=0.05V, Switching Quiescent Current ICC FB=0.15V, No Switching Shutdown Current ICC VEN=GND Input Supply Voltage VDS HVDD=12V, IDS=0A 2.2 V 0.1 V 5 mA 245 µA 6 µA 8 V 200 200 500 90 KHZ KHZ KHZ % Oscillator Operation Frequency fOSC Maximum Duty Ratio % FP7208 RT=NC, FP7208B RT=50KΩ, FP7208B FB=0.05V ISS Vss=0V 1.5 µA VFB EN=Floating EN=2.25V 0.1 0.2 V V Soft Start Soft-Start bias Current Reference Voltage Feedback Voltage Enable Control Enable Voltage VEN Shutdown Voltage VEN 0.25 V 0.15 V External Transistor Connection current EXT Pull-UP Resistance REXTH VDS=8V 1 Ω EXT Pull-Down Resistance REXTL VDS=8V 1 Ω VOVP 0.7 V TTS +150 °C Over Voltage Protection OVP Threshold Thermal Shutdown Thermal Shutdown Threshold 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. 0.60 7/15 FP7208/FP7208B Function Description Operation The FP7208 and FP7208B are voltage mode boost controllers for LED driver. They operate with pulse width modulation (PWM), and change to PSM mode when outputs are light load. The internal resistive divider provides default 0.1V reference for the error amplifier. The maximum reference voltage is only 0.2V, 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. Oscillator The oscillator frequency can be set from 100KHz to 1000KHz by connecting a resistance between RT to ground. Acceptable resistance values range from 300KΩ to 20KΩ. The frequency is 200KHz when the resistance is unconnected. The relationship between the timing resistance RT and frequency is shown in Figure 1. The oscillator frequency can be calculated using formula below. RT(KΩ) = 25000 fOSC (KHz) 1000 900 Frequency (KHz) 800 700 600 500 400 300 200 100 0 10 100 1000 RT Resistance (KΩ) Figure 1. Frequency vs. RT Resistance 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. 0.60 8/15 FP7208/FP7208B 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). The EN pin rising threshold is 0.25V. The EN pin voltage is 1.25V when it is floating for automatic startup application. DC Dimming Control The DC voltage is connected to EN pin to adjust the feedback voltage (VFB) then LED current is also changed. The DC voltage is valid from 0.25V to 2.25V. The feedback voltage and LED current keep constant when the DC voltage is higher than 2.25V. The LED current (ILED) can be calculated using formula below. VFB = V VEN ILED = FB RS 10 ， PWM Dimming Control The PWM signal is connected to EN pin to adjust the feedback voltage (VFB) then LED current is also changed. The EN pin is built-in components of filter to regulate PWM signal become a DC voltage. The DC voltage is valid from 0.25V to 2.25V. The feedback voltage and LED current keep constant when the DC voltage is higher than 2.25V. The PWM signal is recommended above 10KHz. The LED current (ILED) can be calculated using formula below. VFB = V VPWM × Duty ILED = FB RS 10 ， Over Voltage Protection The gate driver signal is turned off when the voltage of OVP pin exceeds 0.7V. The voltage (VOVP) can be calculated using formula below.   VOVP = 0.7V 1 + R3   R4  Thermal Shutdown Protection The IC will shut down automatically when the internal junction temperature exceeds +150°C. The device can restart until the junction temperature drops below +120°C approximately. 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. 0.60 9/15 FP7208/FP7208B Application Information Inductor Selection Inductance value is decided based on different condition. 4.7µH to 22uH 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. 0.60 10/15 FP7208/FP7208B 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 Q1, 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 Q1. 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. 0.60 11/15 FP7208/FP7208B Application Information L1 10µH VIN 12V Q1 AP0504GMT C3 1µF C1 100µF C2 0.1µF EXT VDS C4 33nF C12 100µF C13 10µF R4 3K RS 0.1Ω HVDD EN R3 120K R13 C15 C8 0.1µF VLED 24V Max. 2A D1 SVM1045V2 FP7208 R2 3K COMP OVP C6 1µF FB SS 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. 0.60 12/15 FP7208/FP7208B L1 10µH VIN 12V Q1 AP0504GMT VLED 24V Max. 2A D1 SVM1045V2 R3 120K R13 C3 1µF C1 100µF C2 0.1µF VDS EN C4 33nF R2 3K EXT C12 100µF GND FP7208B COMP C15 C8 0.1µF C13 10µF R4 3K RS 0.1Ω HVDD FB RT SS OVP R6 75K C6 1µF 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. 0.60 13/15 FP7208/FP7208B Package Outline 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 1.94 2.29 D1 1.94 2.29 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. 0.60 14/15 FP7208/FP7208B DFN-10L m Symbols Min. (mm) Max. (mm) A 0.700 0.800 A1 0.000 0.050 A3 b 0.20REF 0.180 0.300 D 3.00 E 3.00 D2 2.200 2.700 E2 1.400 1.750 e 0.500 L 0.300 0.500 K 0.200 - Unit: mm 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. 0.60 15/15