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Document overview
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Technical content
Features
Fast Average Current Control Internal 8 to 100V Linear Regulator Linear and PWM Dimming Capability Output Short Circuit Protection with Skip Mode Requires Few External Components for Operation
Applications
DC/DC or AC/DC LED Driver Applications LED Street Lighting Back Lighting of Flat Panel Displays General Purpose Constant Current Source Signage and Decorative LED Lighting Chargers Typical Application Circuit VDD DIM VINCS GND GATE FP7175 Linear & PWM Dimming LED+ LED- VIN GND
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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 GND DIM GATE VIN VDD CS Regulator POR UVLOInternal supply Average Current Logic Control LEB TOFF TimerSCP 550mV 200mV/250mV DIM to CS ratio=0.167 OTP Pin Descriptions SOT23-6L GATE VIN GND CS CBXXX Top View DIM VDD Name No. I / O Description GATE 1 O This pin is the output GATE driver for an external N-channel power MOSFET. GND 2 P Ground return for all internal circuitry. CS 3 I This pin is the current sense pin used to sense the FET current by means of an external sense resistor. VIN 4 P This pin is the input of an 8 - 100V linear regulator. DIM 5 I This pin is the linear & PWM dimming input of the IC. VDD 6 I This is the power supply pin for all internal circuits.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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 SOT23-6L Lot Number Part Number Code Year CBXXX Lot Number: Wafer lot number’s last two digits For Example: XX486 86 Year: Production year’s last digit Part Number Code: Part number identification code for this product. It should be always “CB”.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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 Code Ambient Operating Temperature Junction Operating Temperature Package MOQ Description FP7175LR-G1 CB -25°C ~ +85°C -25°C ~ +125°C SOT23-6L 3000 EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Power Supply Voltage VIN VIN to GND 100 V VDD VDD to GND 8.5 V CS, DIM, GATE -0.3 VDD-0.3V V Allowable Power Dissipation PD SOT23-6L TA≦+25°C 455 mW Junction to Ambient Thermal Resistance θJA 220 °C / W Operating Temperature -25 +85 °C Storage Temperature TS SOT23-6L -40 +150 °C SOT23-6L 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 w ithout 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 VIN 8 100 V Ambient Operating Temperature -25 +85 °C Junction Operating Temperature -25 +125 °C Parameter Symbol Conditions Min. Typ. Max. Unit Internal Regulator Internally regulated voltage VDD VIN = 8V, I DD(ext)= 0, 500pF at GATE;DIM = VDD 7.25 7.5 7.75 V Line regulation of VDD ΔVDD,line VIN = 8 – 100V, IDD(ext)=0, 500pF at GATE; DIM = VDD 0 - 1.0 V Load regulation of VDD ΔVDD,load IDD(ext) = 0 – 0.6mA, 500pF at GATE; DIM = VDD 0 100 mV VDD undervoltage lockout threshold UVLO VDD rising 6.3 V VDD undervoltage lockout hysteresis ΔUVLO VDD falling 500 mV PWM Dimming Pin DIM input low voltage VEN(lo) VIN = 8 - 100V 0.1 V Pin DIM input high voltage VEN(hi) VIN = 8 - 100V 1.6 V Average Current Sense Logic Current sense reference voltage VCS 243 250 257 mV DIM-to-CS voltage ratio AV(DIM) 0.167 DIM-to-CS voltage offset AVDIM (OFFSET) Offset = VCS – AV(DIM)‧VDIM VDIM=1.2V 0 10 mV CS threshold temp regulation 5 mV DIM input voltage, shutdown VDIM(OFF) 200 mV DIM input voltage, enable △ VDIM(OFF) 250 mV Current sense blanking interval TBLANK 150 320 ns Minimum steady-state duty cycle TON(min) CS=VCS + 30mV 1000 ns Short Circuit Protection Hiccup threshold voltage VCS 495 550 605 mV Current limit delay CS - GATE TDELAY CS=VCS + 30mV 150 ns Short circuit hiccup time THICCUP 450 550 650 us Minimum on-time (short circuit) TON(min) CS=VDD 600 ns
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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. Parameter Symbol Conditions Min. Typ. Max. Unit GATE Driver GATE sourcing current ISOURCE VGATE = 0V, VDD = 7.5V 165 mA GATE sinking current ISINK VGATE = VDD, VDD = 7.5V 165 mA GATE output rise time tRISE CGATE = 500pF, VDD = 7.5V 30 50 ns GATE output fall time tFALL CGATE = 500pF, VDD = 7.5V 30 50 ns OFF-Time Minimum off time TOFF(MIM) 0.6 us Maximum off time TOFF(MAX) 50 us Maximum on time TON(MAX) 60 us
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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 Input Voltage Regulator The FP7175 can be powered directly from its VIN pin and can work from 8.5 - 100VDC at its VIN pin. When a voltage is applied at the VIN pin, the FP7175 maintains a constant 7.5V at the VDD pin. This voltage is used to power the IC and any external resistor dividers needed to control the IC. The VDD pin must be bypassed by a low ESR capacitor to provide a low impedance path for the high frequency current of the output GATE driver. The FP7175 can also be operated by supplying a voltage at the VDD pin greater than the internally regulated voltage. This will turn off the internal linear regulator of the IC and the FP7175 will operate directly off the voltage supplied at the VDD pin. Please note that this external voltage at the VDD pin should not exceed 8.5V. In the above equation, f S is the switching frequency and QG is the GATE charge of the external FET (which can be obtained from the datasheet of the FET).
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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. Average Current Control The LED current is detected using a sense resistor at the CS pin. The feedback operates in a fast open-loop mode. No compensation is required. When the voltage at the DIM input VDIM ≥ 1.5V, output current is programmed simply as: )Ω(R V25.0=)A(I CS LED Otherwise: )Ω(R 167.0×)V(V=)A(I CS DIM LED CS LED Current Average Current = 0.25V RCS 0.25V t t The above equations are only valid for continuous conduction of the output inductor. It is a good practice to design the inductor such that the switching ripple current in it is 25% of its average peak-to-peak, full load, DC current. GATE Output The GATE output of the FP7175 is used to drive an external MOSFET. It is recommended that the gate charge QG of the external MOSFET be less than 25nC for switching frequencies ≤100kHz and less than 15nC for switching frequencies >100kHz.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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. Output Short Circuit Protection The short circuit protection comparator trips when the voltage at CS exceeds 0. 55V. When this occurs, the GATE off -time THICCUP = 550μs is generated to prevent stair -casing of the inductor current and potentially its saturation due to insufficient output voltage. VCS t 550mV 550mV RCS ILED 550us(Typ.) Linear Dimming When the voltage at DIM falls below 1.5V, the internal 250mV reference to the constant -current feedback becomes overridden by V DIM • 0. 167. As long as the current in the inductor remains continuous, the LED current is given by the equation above. However, when V DIM falls below 200mV, the GATE output becomes disabled. The GATE signal recovers, when VDIM exceeds 250mV. This is required in some applications to be able to shut the LED lamp off with the same signal input that controls the brightness. 100% 80% 60% 40% 20% LED Current DIM(V)
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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. PWM Dimming Due to the fast open -loop response of the average -current control loop of the FP7175, its PWM dimming performance nearly matches that of the FP7171. LED Current PWM Dimming GATE t V The rising and falling edges are limited by the current slew rate in the inductor. The first switching cycle is terminated upon reaching the 250mV (VDIM • 0.167) level at CS. The circuit is further reaching its steady-state within 1 switching cycles regardless of the switching frequency.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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=12V, LED=9.2V, TA = 25°C, unless otherwise noted Input Voltage VS LED Current 0.4 0.8 1.2 1.6 0 30 60 90 Input Voltage(V) LED Current(A) Input Voltage VS Frequency 100 0 30 60 90 Input Voltage(V) Frequency(kHz) L=100uH LED Voltage VS LED Current 1.8 1.82 1.84 1.86 1.88 1.9 2 4 6 8 10 LED Voltage(V) LED Current(A) VIN=12V Vin=24V Inductor VS LED Current 1.7 1.75 1.8 1.85 1.9 1.95 20 50 80 110 Inductor(uH) LED Current(A) DIM Voltage VS LED Current 0.4 0.8 1.2 1.6 0 0.4 0.8 1.2 1.6 DIM Voltage(V) LED Current(A) PWM Duty VS LED Current 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 0 20 40 60 80 100 PWM Duty(% ) LED Current(A) PWM=0V~3.3V(500Hz)
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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. Suggested Layout GND VIN CS VDDGATE DIMGND VIN FP7175 LED Load R1 C1 LED+ LED-
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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 Application Circuit VIN=11V~100V VDD DIM VINCS GND GATE FP7175 LED+ LED- VIN GND SR510VF VLED=3V ~ 9.5V ILED=2A 47uH 12N10 RCS 0.125 0.47uFC1 22uF/100V
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification w ithout 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 SOT23-6L Unit: mm Note: 1. Package dimensions are in compliance with JEDEC outline: MO-178 AB. 2. Dimension “D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E1” does not include inter-lead flash or protrusions. Symbols Min. (mm) Max. (mm) A 1.050 1.450 A1 0.050 0.150 A2 0.900 1.300 b 0.300 0.500 c 0.080 0.220 D 2.900 BSC E 2.800 BSC E1 1.600 BSC e 0.950 BSC e1 1.900 BSC L 0.300 0.600 L1 0.600 REF L2 0.250 BSC θ° 0° 8° θ1° 3° 7° θ2° 6° 15°