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Technical content
Features
Precision Feedback Reference Voltage: 0.25V (4%) Under Voltage Lockout Protection Over Voltage Protection Over Temperature Protection Wide Frequency Range and Dimming with Zero-Inrush Current Internal Soft-Start Zero Shutdown Current Adjustable Output up to 26V Package: TSOT23-6L
Applications
Smart Phone LED Backligh ts Digital Cameras Camcorders PDA LED Backlights Typical Application Circuit
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 Pin Descriptions TSOT23-6L Name No. I / O Description LX 1 O Power Switch Output GND 2 P Ground FB 3 I Error Amplifier Inverting Input EN 4 I Enable Control (Active High) OVP 5 O Over Voltage Protection VCC 6 P IC Power Supply
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 TSOT23-6L Lot Number: Wafer lot number’s last two digits For Example: 132386TB 86 Year: Production year’s last digit Part Number Code: Part number identification code for this product. It should be always “AD”.
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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
Code Operating Temperature Package MOQ Description FP7201hR-G1 AD -40°C ~ +85°C TSOT23-6L 3000EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage V CC 6 V OVP Voltage 28 V LX Input Voltage -0.3 28 V EN, FB Voltage -0.3 6 V Allowable Power Dissipation TA≦+25°C 455 mW Thermal Resistance θJA +220 °C / W Junction Temperature +150 °C Operating Temperature -40 +85 °C Storage Temperature -65 +150 °C TSOT23-6L Lead Temperature (soldering, 10 sec) +260 °C IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 Junction Temperature Range -40 +125 °C Ambient Temperature Range -40 +85 °C Parameter Symbol Conditions Min. Typ. Max. Unit System Supply Input Input Supply Range V CC 2.7 5.5 V Under Voltage Lockout V UVLO 2.2 V Quiescent Current I CC V FB=0.3V, No switching 0.3 mA Average Supply Current I CC V FB=0V, Switching 0.5 mA Shutdown Supply Current I CC V EN=GND 0.1 µA Oscillator Operation Frequency F OSC V FB=1.0V 0.9 1.2 1.5 MH Z Frequency Change with Voltage f △ / V△ V CC=2.7V to 5.5V 2 % Frequency Change with Temperature f△ / T△ TA=-40°C to 85°C 10 % Maximum Duty Cycle T DUTY 85 % Reference Voltage Feedback Voltage VREF 0.24 0.25 0.26 V Feedback Voltage Change with Temperature △VREF / T△ TA=-40°C to 25°C 1.5 TA=25°C to 85°C 1.5 Line Regulation VCC=2.7V～5.5V 0.01 % / V MOSFET On Resistance of Driver R DS (ON) I LX=0.1A 0.75 Ω Protection OVP Threshold Voltage V OVP 27 V OVP Sink Current I SINK 5 µA OCP Current I OCP 750 mA OTP Temperature T OTP +150 ° C Enable Voltage V EN 1.5 V Shutdown Voltage V EN 0.4 V
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 (VCC=3.7V, TA=25° , unless otherwise specified) Enable Voltage vs. Input Voltage 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Enable Voltage (V) -40℃ 25℃ 85℃ Switching Frequency vs. Input Voltage 1.20 1.21 1.22 1.23 1.24 1.25 1.26 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Switching Frequency (MHz) Feedback Voltage vs. Input Voltage 0.248 0.249 0.250 0.251 0.252 0.253 0.254 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Feedback Voltage (V) LED Current vs. Input Voltage 20.0 20.1 20.2 20.3 20.4 20.5 20.6 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) LED Current (mA) 5WLEDs, L=10µH LED Current vs. Input Voltage 20.0 20.1 20.2 20.3 20.4 20.5 20.6 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) LED Current (mA) 5WLEDs, L=10µH Shutdown Voltage vs. Input Voltage 0.3 0.5 0.7 0.9 1.1 1.3 1.5 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Shut Down Voltage (V) -40℃ 25℃ 85℃ Switching Frequency vs. Temperature 1.18 1.20 1.22 1.24 1.26 1.28 -60 -40 -20 0 20 40 60 80 100 Temperature (℃) Switching Frequency (MHz) VIN=3.7V Switching Frequency vs. Temperature 1.18 1.20 1.22 1.24 1.26 1.28 -60 -40 -20 0 20 40 60 80 100 Temperature (℃) Switching Frequency (MHz) VIN=3.7V Feedback Voltage vs. Temperature 0.248 0.249 0.250 0.251 0.252 0.253 0.254 -60 -40 -20 0 20 40 60 80 100 Temperature (℃) Feedback Voltage (V) VIN=3.7V Feedback Voltage vs. Temperature 0.248 0.249 0.250 0.251 0.252 0.253 0.254 -60 -40 -20 0 20 40 60 80 100 Temperature (℃) Feedback Voltage (V) VIN=3.7V LED Current vs. Temperature 20.0 20.1 20.2 20.3 20.4 20.5 20.6 -60 -40 -20 0 20 40 60 80 100 Temperature (℃) LED Current (mA) VIN=3.7V, 5WLEDs, L=10µH LED Current vs. Temperature 20.0 20.1 20.2 20.3 20.4 20.5 20.6 -60 -40 -20 0 20 40 60 80 100 Temperature (℃) LED Current (mA) VIN=3.7V, 5WLEDs, L=10µH
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. Efficiency vs. Input Voltage 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Efficiency (%) 4WLEDs 3WLEDs ILED=20mA, L=4.7µH, DCR=0.25Ω Efficiency vs. Input Voltage 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Efficiency (%) 4WLEDs 3WLEDs ILED=20mA, L=4.7µH, DCR=0.25Ω Switching Current vs. Input Voltage 0.20 0.30 0.40 0.50 0.60 0.70 0.80 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Switching Current (mA) -40℃ 25℃ 85℃ Maximum Duty Cycle vs. Input Voltage 90.0 90.4 90.8 91.2 91.6 92.0 92.4 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Maximum Duty Cycle (%) VEN VREF ILED f=100Hz, Duty=50% VIN=3.7V, 4WLEDs, ILED=20mA PWM Dimming from EN VEN VREF ILED f=100Hz, Duty=50% VIN=3.7V, 4WLEDs, ILED=20mA PWM Dimming from EN Current Limit vs. Input Voltage 400 450 500 550 600 650 700 750 800 850 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Current Limit (mA) VOUT=12V, L=10µH Current Limit vs. Input Voltage 400 450 500 550 600 650 700 750 800 850 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Current Limit (mA) VOUT=12V, L=10µH POR(Rising/Falling) vs. Temperature 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 -60 -40 -20 0 20 40 60 80 100 Temperature (℃) POR (V) Rising Falling POR(Rising/Falling) vs. Temperature 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 -60 -40 -20 0 20 40 60 80 100 Temperature (℃) POR (V) Rising Falling VEN VREF ILED f=1kHz, Duty=50% VIN=3.7V, 4WLEDs, ILED=20mA PWM Dimming from EN VEN VREF ILED f=1kHz, Duty=50% VIN=3.7V, 4WLEDs, ILED=20mA PWM Dimming from EN
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. VEN VREF ILED f=100kHz, Duty=50% VIN=3.7V, 4WLEDs, ILED=20mA PWM Dimming from EN VEN VREF ILED f=100kHz, Duty=50% VIN=3.7V, 4WLEDs, ILED=20mA PWM Dimming from EN VIN VOUT VEN VIN=3.7V, 4WLEDs, ILED=20mA IL Power Off from EN VIN VOUT VEN VIN=3.7V, 4WLEDs, ILED=20mA IL Power Off from EN VIN VOUT VLX VIN=3.7V, 4WLEDs, ILED=20mA, L=10µH IL Normal Operation VIN VOUT VLX VIN=3.7V, 4WLEDs, ILED=20mA, L=10µH IL Normal Operation VIN VOUT LX VIN=5.5V, 4WLEDs, ILED=20mA, L=10µH IL Normal Operation VIN VOUT LX VIN=5.5V, 4WLEDs, ILED=20mA, L=10µH IL Normal Operation VIN VOUT VEN VIN=3.7V, 4WLEDs, ILED=20mA IL Power On from EN VIN VOUT VEN VIN=3.7V, 4WLEDs, ILED=20mA IL Power On from EN VIN VOUT VLX VIN=3.0V, 4WLEDs, ILED=20mA, L=10µH IL Normal Operation VIN VOUT VLX VIN=3.0V, 4WLEDs, ILED=20mA, L=10µH IL Normal Operation VIN VOUT LX VIN=4.2V, 4WLEDs, ILED=20mA, L=10µH IL Normal Operation VIN VOUT LX VIN=4.2V, 4WLEDs, ILED=20mA, L=10µH IL Normal Operation
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 FP7201 is a current mode boost converter for LED driver. The constant switching frequency is 1.2MHz and operates with pulse widt h modulation (PWM). Build-in 27V / 0.75A MOSFET driver provides a high output voltage for 2~7 white LEDs. The control loop architecture is peak current mode control, therefore slope compensation circuit is added to the current signal to allow stable operation for duty cycles larger than 50%. The feedback refe rence voltage is only 0.25V, reducing the power dissipation in the current sensing resistor. Soft Start Function Soft start circuitry is integrated into FP7201 to av oid inrush current during power on. After the IC is enabled, the output of error amplifier is clamped by the internal soft-start function, which causes PWM duty signal increasing slowly and thus reducing surge current. Over Voltage Protection (OVP) In some condition, the WLEDs maybe fail or ope n, which will cause the PWM signal to operate with maximum duty cycle. The output voltage will be boosted higher and higher. When the output voltage exceeds the OVP threshold level, OVP func tion will turn off the power MOSFET driver immediately. The FP7201’s OVP threshold is 27V. Over Temperature Protection (OTP) FP7201 will turn off the power MOSFET automatically when the internal junction temperature is higher than 150°C. The power MOSFET wake up when the junction temperature drops 30°C under the OTP threshold.
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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.
Application Information
General Application Circuit FP7201 VCC EN GND LX FB 10µF PWM L1 5.6µH D1 MSCD 1020 10µF LED1 LED2 LED3 12.5Ω LED4 LED5 VIN 2.7V~5.5V OVP 5
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. Setting the LED Current Feedback resistance R1 decides the LED curren t. The current through LEDs is equal to 0.25V / R1. The following table shows the selection of R1 for different LED current. ILED vs. R1 Dimming Control Dimming control can adjust LED brightness. There are three ways to control LED current for the FP7201, as shown in the following. a. Using the PWM Signal to EN Pin The first way uses the PWM signal to control t he Enable pin for regulating LED brightness. The LED current is between the full load to complete shutoff, and the average LED current is proportional to the PWM signal duty cycle. In addition, the PWM signal frequency should be larger than 2kHz. ILED (mA) R1 (Ω) 1 250 5 50 10 25 15 16.6 20 12.5
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. b. Using a DC Voltage The second way uses a variable DC voltage to control the feedback voltage. When the DC voltage increases, and the circuit loop through R2 and R3 to regulate the feedback voltage. It will reduce the LED current. If the DC voltage ranges fr om 0V to 2.5V, the resistor values shown for R 1、 R2 and R3 can control the LED current from 20mA to 0mA. The LED current can be calculated by the following equation: FBDC2 FB LED R R )VV(RV I c. Using a Filtered PWM Signal The filtered PWM signal can be considered as an adjustable DC voltage. It can be used to replace the variable DC voltage source in dimming c ontrol. The application circuit is shown in the following. The LED current can be calculated by the following equation: FBPWM2 FB LED R RR )VDutyV(RV I
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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. FP7201 LED1 LED2 LED3 FB GND LX OVP EN VCC VIN VOUT GND CIN COUT R L D Inductor Selection Inductance value is decided based on different condition. 4.7 to 22 µH inductor value is recommended for 2 to 7 WLEDs applications. There are three important inductor specifications, DC resistance, saturation current and core loss. Low DC resistance (DCR) has better power efficiency. Also, it avoids inductor saturation causing circuit system unstably and lower core loss at 1.2MHz. Capacitor Selection The output capacitor is required to maintain the series LED voltage during . 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 temperature range. Diode Selection Schottky diodes have fast recovery times and low forward voltages are recommended. Ensure that the diode average and peak current rating exce eds the average output current and peak inductor current. In addition, the diode’s reverse breakd own voltage must exceed the open LED protection voltage. Layout Considerations 1. The power traces, consisting of the GND trace, the LX trace and the V CC trace should be kept short, direct and wide. 2. LX、Inductance L and Diode D switching node, wide and short trace to reduce EMI. 3. Place CIN near VCC pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. 4. Feedback resistance R 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, LX. 6. The GND of the IC, CIN, COUT should be connected close together directly to a ground plane.
This datasheet contains new product information. Feeling Technology reserves the ri ghts 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 TSOT23-6L U n i t : m m Note: 1. Dimension “D” does not include moldi ng flash, protrusions or gate burrs. 2. Dimension “E1” does not include inter-lead flash or protrusions. Symbols Min. (mm) Max. (mm) A 0.750 0.800 A1 0.000 0.050 A2 0.700 0.775 b 0.350 0.500 c 0.100 0.200 D 2.800 3.000 E 2.600 3.000 E1 1.500 1.700 e 0.950 BSC e1 1.900 BSC L 0.370 0.600 L1 0.600 REF L2 0.250 BSC R 0.100 R1 0.100 0.250 θ° 0 ° 8 ° θ1 4° 12 °