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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 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 Dimming LED+ LED- VIN GND FP7189 NC VDD DIM NCVIN CS GND GATE
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 NC NC Pin Descriptions SOP-8L DIM NC1 VIN CS GATE VDD NC FP7189 XXx-XXL Top View GND Name No. I / O Description VIN 1 P This pin is the input of an 8 - 100V linear regulator. CS 2 I This pin is the cu rrent sense pin used to sense the FET current by means of an external sense resistor. GND 3 P Ground return for all internal circuitry. GATE 4 O This pin is the output GATE driver for an external N-channel power MOSFET. NC 5 - No connect. VDD 6 P This is the power supply pin for all internal circuits. DIM 7 I This pin is the linear and PWM dimming input of the IC. NC 8 - No connect.
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 Halogen Free Lot Number Internal ID Per - Half Month Year FP7189 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 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 Operating Temperature Package MOQ Description FP7189DR-G1 -25°C ~ +85°C SOP-8L 2500 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 SOP-8L TA≦+25°C 630 mW Junction to Ambient Thermal Resistance θJA 128 °C / W Operating Temperature -25 +85 °C Storage Temperature TS SOP-8L -40 +150 °C SOP-8L 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 8.5 100 V Operating Temperature -25 85 °C Parameter Symbol Conditions Min. Typ. Max. Unit Internal Regulator Internally regulated voltage VDD VIN = 8V, IDD(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 5.75 6.0 6.25 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 0.245 0.25 0.255 mV DIM-to-CS voltage ratio AV(DIM) 0.164 0.167 0.17 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 250 350 ns Minimum on-time 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 Notes: # Guaranteed by design
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 TOFF Timer Minimum off time TOFF(MIM) 0.6 us Maximum off time TOFF(MAX) 50 us Maximum on time TON(MAX) 60 us 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
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 FP7189 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 FP7189 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 FP7189 can also be operated by supplying a voltage at the VDD pin greater than the internally regulated voltage. This will turn off the internal li near regulator of the IC and the FP7189 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 ch arge 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 th e 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 30% of its average peak-to-peak, full load, DC current. Hence, the recommended inductance can be calculated as: LED OFF)MAX(LED I×4.0 T×V GATE Output The GATE output of the FP7189 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 compar ator 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 equati on 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 FP7189, 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. Suggested Layout GND VIN LED Load D1C1 VIA to GND FP7189 NC VDD DIM NCVIN CS GND GATE C2
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 SR510VF 47uH 12N10 RCS 0.125 VLED=3V ~ 9.5V ILED=2A 22uF/100V 0.47uF VIN=11V~100V Dimming LED+ LED- VIN GND FP7189 NC VDD DIM NCVIN CS GND GATE
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 SOP-8L UNIT: mm 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 1.346 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°