Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 General Description Features The AP3033 is an inductor-based DC/DC boost converter designed to drive LED arrays. 1.3A switching current allows AP3033 to be used in different 7' to 10' LCD panel backlights (3S8P LED arrays typically). · Up to 92% Efficiency (VIN=9V, IOUT=160mA) · Up to 88% Efficiency (VIN=5V, IOUT=160mA) The over output voltage protection is equipped in AP3033, which protects the IC under open load condition. The AP3033 includes UVLO, soft-start, standby mode, current limit and OTSD to protect the circuit. · · · · · · · · · Fast 1MHz Switching Frequency Wide Input Voltage Range: 3V to 16V Low 200mV Feedback Voltage Output Over Voltage Protection Cycle by Cycle Current Limit: 1.3A High Frequency PWM Dimming Built-in Soft-start Built-in Thermal Shutdown Function Under Voltage Lockout The AP3033 is available in standard TSOT-23-6 package. Applications A constant frequency 1MHz PWM control scheme is employed in this IC, which means tiny external components can be used. Specifically, 1mm tall 10µH inductor and 10µF output capacitor for the typical application is sufficient. · · · · · 7' to 10' LCD Panels Digital Photo Frame GPS Receiver Netbook PDVD TSOT-23-6 Figure 1. Package Type of AP3033 Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Pin Configuration KT Package (TSOT-23-6) Pin 1 Dot by Marking SW 1 6 VIN GND 2 5 OV FB 3 4 CTRL Figure 2. Pin Configuration of AP3033 (Top View) Pin Description Pin Number Pin Name 1 SW 2 GND 3 FB Function Switch Pin. Connect external inductor and Schottky Ground Pin Voltage Feedback Pin. Reference voltage is 200mV Enable and Dimming Control Pin. Connect to a high input to enable the IC or a low input to disable the IC. If logic low time is more than about 0.45ms and then enable the IC, the AP3033 will soft start to protect system departments. If logic low time is less than about 0.45ms and then enable the IC, the AP3033 will hold on standby mode and start directly to achieve high frequency dimming 4 CTRL 5 OV Over-voltage Protection Input Pin. Connect to the output directly or connect to the VOUT through a resistor divider to set the OVP voltage. On OVP condition, the output voltage will be clamped 6 VIN Input Supply Pin. Must be locally bypassed Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Functional Block Diagram SW FB 3 1 SOFT START OVP A2 CONTROL LOGIC COMPARATOR OVER TEMPERATURE DETECTOR R C 200mV REF CTRL 4 Σ VREF 1.25V STANDBY OV 2 GND DRIVER A1 FB REF 5 Q1 RAMP GENERATOR 1 MHz OSCILLATOR 6 VIN Figure 3. Functional Block Diagram of AP3033 Ordering Information AP3033 - Circuit Type G1: Green Package TR: Tape and Reel KT: TSOT-23-6 Package Temperature Range TSOT-23-6 -40 to 85oC Part Number AP3033KTTR-G1 Marking ID L8G Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage VIN 20 V SW Voltage VSW 38 V FB Voltage VFB 20 V OV Voltage VOV 20 V VCTRL 20 V Thermal Resistance (Junction to Ambient, No Heat Sink) θJA 265 Operating Junction Temperature TJ 150 TSTG -65 to 150 TLEAD 260 oC ESD (Machine Model) 600 V ESD (Human Body Model) 4000 V CTRL Voltage Storage Temperature Range Lead Temperature (Soldering, 10sec) o C/W oC o C Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Operating Temperature Range TOP -40 85 o Input Voltage VIN 3 16 V CTRL Voltage VCTRL 16 V Jan. 2010 Rev. 1. 0 Unit C BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Electrical Characteristics (VIN=5.0V, VCTRL =5.0V, TA=25oC, unless otherwise specified.) Parameter Symbol Operating Voltage VIN Quiescent Current IQ Shutdown Quiescent Current ISHDN Feedback Voltage (Note 2) VFB FB Pin Bias Current IFB Switching Frequency f Maximum Duty Cycle DMAX Switch Current Limit ILIMIT Switch VCE Saturation Voltage VCESAT Switch Leakage Current Conditions Min Typ 3.0 VFB=VIN, no switching 4.0 VCTRL=0V IOUT=20mA, 3 LEDs, 5.0 Max Unit 16 V 6.0 mA µA 50 200 212 mV 35 100 nA 0.75 1 1.3 MHz 90 93 % 1.2 1.3 A ISW=0.6A 350 mV VSW=38V 0.01 TA=-40oC to 85oC D=60% 188 5 µA CTRL Pin Voltage VCTRL 1.2 V CTRL Pin Bias Current ICTRL 60 µA OVP Voltage VOVP 17 V Soft-start Time tSS 80 µs Standby Time tSTB 0.45 ms TOTSD 150 oC Thermal Shutdown Note 2: The bold type specifications of full temperature range are guaranteed by design (GBD). Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Typical Performance Characteristics (WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.) 100 100 80 Efficiency (%) Efficiency (%) 80 60 40 40 20 VIN=5V,VOUT=10V 20 60 VOUT=10V, IOUT=160mA, 0 0 L=10µH,TA=25 C L=10µH, TA=25 C 0 0 0 50 100 150 200 250 4 5 6 300 7 8 9 Input Voltage (V) Output Current (mA) Figure 5. Efficiency vs. Input Voltage Figure 4. Efficiency vs. Output Current 7.0 2.6 Quiescent Current (mA) Minimum Operating Voltage (V) 6.5 2.5 2.4 2.3 2.2 2.1 2.0 6.0 5.5 5.0 4.5 4.0 0 VFB=VIN, TA=25 C 3.5 3.0 -40 -20 0 20 40 60 80 100 120 0 2 4 6 8 10 12 14 16 Input Voltage (V) Case Temperature ( C) Figure 7. Quiescent Current vs. Input Voltage Figure 6. Minimum Operating Voltage vs. CaseTemperature Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Typical Performance Characteristics (Continued) (WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.) 1000 220 900 210 Saturation Voltage (mV) Feedback Voltage (V) 800 200 190 180 170 700 600 500 400 0 TC=-40 C 300 0 TC=25 C 200 160 0 TC=85 C 100 150 -40 -20 0 20 40 60 80 100 0.2 120 0.4 0.6 0.8 1.0 Switch Current (A) 0 Case Temperature ( C) Figure 9. Saturation Voltage vs. Switch Current Figure 8. Feedback Voltage vs. Case Temperature 20 1.8 19 1.5 OVP Voltage (V) Frequency (MHz) 18 1.2 0.9 17 16 15 0.6 14 0.3 0.0 13 12 -40 -20 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120 0 Case Temperature ( C) 0 Case Temperature ( C) Figure 11. OVP Voltage vs. Case Temperature Figure 10. Frequency vs. Case Temperature Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Typical Performance Characteristics (Continued) (WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.) 1.8 1.6 Current Limit (A) 1.4 1.2 1.0 0.8 0 0.6 TC=-40 C 0 0.4 TC=25 C 0.2 TC=85 C 0 0.0 10 20 30 40 50 60 70 80 90 Duty Cycle (%) Figure 12. Current Limit vs. Duty Cycle Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Application Information Soft Start The AP3033 has an internal soft start circuit to limit the inrush current during startup. If logic low time on CTRL pin is more than about 0.45ms and then enable the IC, the AP3033 will start smoothly to protect system departments. The time of startup is controlled by internal soft-start capacitor. Details please refer to Figure 13. Operation The AP3033 is a boost DC-DC converter which uses a constant frequency, current mode control scheme to provide excellent line and load regulation. Operation can be best understood by referring to Figure 3 and Figure 17. At the start of each oscillator cycle, switch Q1 turns on. The switch current will increase linearly. The voltage on sense resistor is proportional to the switch current. The output of the current sense amplifier is added to a stabilizing ramp and the result is fed into the noninversion input of the PWM comparator A2. When this voltage exceeds the output voltage level of the error amplifier A1, the switch is turned off. It is clear that the voltage level at inversion input of A2 sets the peak current level to keep the output in regulation. This voltage level is the output signal of error amplifier A1, and is the amplified signal of the voltage difference between feedback voltage and reference voltage of 200mV. So, a constant output current can be provided by this operation mode. LED Current Control Refer to Figure 17, the LED current is controlled by the feedback resistor RISET. LEDs' current accuracy is determined by the regulator's feedback threshold accuracy and is independent of the LED's forward voltage variation. So the precise resistors are preferred. The resistance of RISET is in inverse proportion to the LED current since the feedback reference is fixed at 200mV. The relation for RISET and LED current (ILED)can be expressed as below: RISET = 200mV I LED VCTRL 2V/div VSW 5V/div VO 5V/div IL 500mA/div Time 80µs/div Figure 13. Soft-start Waveform VIN=5V, 3×8 LEDs, ILED=160mA Dimming Control For controlling LED brightness, the AP3033 provides typically 200mV feedback voltage when the CTRL pin is pulled constantly high. However, CTRL pin allows a PWM signal to reduce this regulation voltage by changing the PWM duty cycle to achieve LED brightness dimming control. Detail circuit, as show in Figure 14. The relationship between the duty cycle and LED current can be expressed as below: I LED = 200mV × DPWM RISET where DPWM is the duty cycle of PWM signal and 200mV is internal reference voltage. 200mV Ctrl Over Voltage Protection A EA The AP3033 has an internal open load protection circuit. When the LEDs are disconnected from circuit or fail open, the output voltage is clamped at about 17V. The AP3033 will switch at a low frequency, and minimize current to avoid input voltage drop. Jan. 2010 Rev. 1. 0 FB Figure 14. Bolck Diagram of Programmable FB Voltage Using PWM Signal BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Application Information (Continued) Two other typical types of dimming control circuit are presented as below. (1) Using DC Voltage to Change the Effective Feedback Voltage Adding a constant DC voltage through a resistor divider to FB pin can control the dimming. Changing the DC voltage or resistor between the FB Pin and the DC voltage can get appropriate luminous intensity. Comparing with all kinds of PWM signal control, this method features a stable output voltage and LEDs current. Please refer to Figure 15. FB R3 AP3033 FB PWM R4 R3 C Effective Feedback Voltage R2 R1 Figure 16. Dimming Control Using Filtered PWM Voltage AP3033 VDC (2) Using Filtered PWM Signal to Change the Effective Feedback Voltage The filtered PWM signal can be considered as a varying and adjustable DC voltage, please refer to Figure 16. Effective Feedback Voltage R2 R1 Figure 15. Dimming Control Using DC Voltage Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 10 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Typical Application VIN 5V CIN 10 µF On /Off L 10 µH VIN D SW AP3033 CTRL GND VOUT COUT 10µF OV 3S8P FB R ISET Figure 17. Typical Application of AP3033 (3S8P WLEDs) Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 11 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3033 Mechanical Dimensions TSOT-23-6 Unit: mm(inch) 2.800(0.110) 3.000(0.118) 1.500(0.059) 1.700(0.067) R0.100(0.004) MIN 0° 8° 2.600(0.102) 3.000(0.118) Pin 1 Dot by Marking 0.370(0.015) MIN 0.950(0.037) BSC 0.100(0.004) 0.250(0.010) 1.900(0.075) BSC 0.250(0.010) BSC GAUGE PLANE 0.700(0.028) 0.900(0.035) 1.000(0.039) MAX 0.000(0.000) 0.100(0.004) 0.350(0.014) 0.510(0.020) Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 12 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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