AP3019A
Document overview
- Manufacturer or author: Diodes Incorporated
- PDF pages: 12
Technical content
Features
Inherently Uniform LED Current High Efficiency up to 84% No Need for External Schottky Diode Output Over-voltage Protection (OVP) Fixed 1.2MHz Switching Frequency Uses Tiny 1mm Tall Inductor Requires only 0.22F Output Capacitor Pin Assignments (Top View) 3 4 Pin 1 Mark 6SW GND FB CTRL VIN VOUT K/KT Package (SOT-23-6/TSOT-23-6)
Applications
Cellular Phones Digital Cameras LCD Modules GPS Receivers PDAs, Handheld Computers
Document number: DS41298 Rev. 3 - 2 2 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Typical Applications Circuit 22 H 1F 0.22F 10 VIN SW VOUT FB GND CTRL AP3019AControl Signal VIN 3V L CIN COUT C: X5R or X7R dielectric L: SUMIDA CDRH5D28R-220NC or equivalent This circuit can work in full temperature Pin Descriptions Pin Number Pin Name Function 1 SW Switch pin. Connect external inductor
2 GND Ground
3 FB Voltage feedback pin. Reference voltage is 200mV 4 CTRL Shutdown and dimming pin. Connect to 1.8V or higher to enable device; Connect to 0.5V or less to disable device; Connect to a PWM signal to achieve LEDs brightness dimming 5 VOUT Output pin. Connect to the cathode of internal Schottky diode 6 VIN Input supply pin. Must be connected to a local bypass capacitor
Document number: DS41298 Rev. 3 - 2 3 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Functional Block Diagram R S Q
1.2 MHz
1.25 V COMPARATOR OVP 200mV SOFT START FB SW VOUT GND CTRL VIN Absolute Maximum Ratings (Note 1) Note 1. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stres s ratings only , and functional operation of the device at these or any other conditions beyond those indi cated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Symbol Parameter Rating Unit VIN Input Voltage 20 V VSW SW Pin Voltage 38 V VFB Feedback Voltage 20 V VCTRL CTRL Pin Voltage 20 V JA Thermal Resistance (Junction to Ambient, No Heat Sink) 265 C/W TJ Operating Junction Temperature +150 C TSTG Storage Temperature Range -65 to +150 C TLEAD Lead Temperature (Soldering, 10sec) +260 C – ESD (Machine Model) 250 V – ESD (Human Body Model) 2000 V
Document number: DS41298 Rev. 3 - 2 4 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Recommended Operating Conditions Symbol Parameter Min Max Unit TOP Operating Temperature Range -40 +85 C VIN Input Voltage 2.5 16 V VCTRL CTRL Pin Voltage – 16 V Electrical Characteristics (@VIN =3V, VCTRL=3V, TA =+25° C, unless otherwise specified.) Symbol Parameter Condition Min Typ Max Unit VIN (MIN) Minimum Operating Voltage – 2.5 – – V VIN (MAX) Maximum Operating Voltage – – – 16 VFB Feedback Voltage (Note 2) IOUT=20mA, 4 LEDs, TA=-40oC to +85oC 188 200 212 mV IFB FB Pin Bias Current – – 35 100 nA IQ Quiescent Current VFB=VIN, No Switching 1.5 2.5 3.2 mA ISHDN Shutdown Quiescent Current VCTRL=0V 2.0 4.0 6.0 A f Switching Frequency – 0.9 1.2 1.5 MHz DMAX Maximum Duty Cycle – 90 93 – % ILIMIT Switch Current Limit (Note 3) D=40% – 550 – mA D=80% – 550 – VCESAT Switch VCE Saturation Voltage ISW=250mA – 360 – mV – Switch Leakage Current VSW=5V – 0.01 5 A VCTRL CTRL Pin Voltage High 1.8 – – V Low – – 0.5 ICTRL CTRL Pin Bias Current – – 100 – A VOV OVP Voltage – – 30 – V VDROP Schottky Forward Drop ID=150mA – 0.7 – V – Schottky Leakage Current VR(Reverse Voltage)=23V – 0.1 4 VR(Reverse Voltage)=27V – – 150 t Soft Start Time – – 300 – s JC Thermal Resistance (Junction to Case) SOT-23-6 – 60 – C/W TSOT-23-6 – 60 – Notes: 2. The bold type specifications of full temperature range are gu aranteed by design (GBD). 3. The switch current limit is related to duty cycle. Please refer to Figure Current Limit vs. Duty Cycle for detail.
Document number: DS41298 Rev. 3 - 2 5 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Performance Characteristics (WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted.) Efficiency vs. Junction Temperature Efficiency vs. Input Voltage Efficiency vs. LED’s Number Schottky Forward Current vs. Schottky Forward Drop Shutdown Quiescent Current vs. Input Voltage Quiescent Current vs. Input Voltage -50 -25 0 25 50 75 100 VIN=3.6V, IOUT=20mA, 8 LEDs CIN=1F, COUT=0.22F, L=22H Efficiency (%) Junction Temperature ( o IOUT=20mA, 8 LEDs,TA=+25 O C CIN=1F, COUT=0.22F, L=22H Efficiency (%) Input Voltage (V) 2 3 4 5 6 7 8 VIN=3.6V, IOUT=20mA,TA=+25 O C CIN=1F, COUT=0.22F, L=22H LED's Number Efficiency (%) 0 200 400 600 800 1000 100 150 200 250 300 350 Schottky Forward Current (mA) Schottky Forward Drop (mV) 2 4 6 8 10 12 14 16 Shutdown Quiescent Current (A) Input Voltage (V) TA=+25 O C 0 2 4 6 8 10 12 14 16 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Quiescent Current (mA) Input Voltage (V) TA=-50 O C TA=+25 O C TA=+100 O C
Document number: DS41298 Rev. 3 - 2 6 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Performance Characteristics (WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted.) (Cont.) Input Current in Output Open Circuit vs. Input Voltage Frequency vs. Junction Temperature Feedback Voltage vs. Junction Temperature Schottky Forward Drop vs. Junction Temperature Schottky Leakage Current vs. Junction Temperature Current Limit vs. Duty Cycle -50 -25 0 25 50 75 100 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 Frequency (MHz) Junction Temperature ( o 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Current (mA) Input Voltage (V) -50 -25 0 25 50 75 100 190 192 194 196 198 200 202 204 206 208 210 Feedback Voltage (mV) Junction Temperature ( o -50 -25 0 25 50 75 100 0.60 0.62 0.64 0.66 0.68 0.70 0.72 0.74 0.76 0.78 0.80 Schottky Forward Drop (V) Junction Temperature ( o ID=150mA -50 -25 0 25 50 75 100 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Schottky Leakage Current (A) Junction Temperature ( o VR=10V VR=16V VR=23V 30 40 50 60 70 80 90 100 200 300 400 500 600 700 -50 O C +25 O C +100 O C Current Limit (mA) Duty Cycle (%)
Document number: DS41298 Rev. 3 - 2 7 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT LED 1 I mV200R = Performance Characteristics (WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted.) (Cont.) Saturation Voltage vs. Switch Current CTRL Pin Voltage vs. Junction Temperature
Application Information
The AP3019A is a boost DC -DC converter which uses a constant frequency, current mode control scheme to pr ovide excellent line and load regulation. Operation can be best understood by referring to the Figure Functional Block Diagram of AP3019A. At the start of each oscillator cycle, the SR latch is set and 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 non-inversion input of the PWM comparator A2. When this voltage exceeds t he output voltage level of the error amplifier A1, the SR latch is reset and 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. Thi s voltage level is the output signal of error amplifier A1, and is the amplified signal of the voltage difference between feedback voltage and reference vo ltage of 200mV. So, a constant output current can be provided by this operation mode. VIN SW VOUT FB GND CTRL AP3019AControl Signal VIN Typical Application Circuit to Decide R1 LED Current Control Refer to Figure Typical Application Circuit to Decide R1 , the LED current is controlled by the feedback resistor R1. 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 R1 is in inverse proportion to the LED current since the feedback reference is fixed at 200mV. The relation for R1 and LED current can be expressed as below: 50 100 150 200 250 300 100 150 200 250 300 350 400 450 Saturation Voltage (mV) Switch Current (mA) -50 -25 0 25 50 75 100 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 CTRL Pin Voltage (V) Junction Temperature ( O Falling Edge Rising Edge
Document number: DS41298 Rev. 3 - 2 8 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Application Information (Cont.) Over Voltage Protection The AP3019A has an internal open -circuit protection circuit. When the LEDs are disconnected from circuit or fail open, the output voltage is clamped. The AP3019A will switch at a low frequency, and minimize input current. Soft Start The AP3019A has an internal soft start circuit to limit the inrush current during startup. The time of startup is controlled by internal soft start capacitor. Please refer to Figure Soft Start Waveform. IIN 100mA/div VOUT 5V/div VCTRL 2V/div Time 100s/div VFB 100mV/div Soft Start Waveform VIN=3.6V, 5 LEDs, ILED=20mA Dimming Control Two typical types of dimming control circuit are present as below. First, controlling CTRL Pin voltage to change operation st ate is a good choice. Second, changing the feedback voltage to get appropriate duty and luminous intensity is also useful. (1) Adding a Control Signal to CTRL Pin Add a PWM Signal to CTRL pin directly. The AP3019A is turned on or off by the PWM signal when it is applied on the CTRL pin. The typical frequency of this PWM signal can be up to 2kHz. Please refer to Figure Dimming Control Using a PWM Signal in CTRL Pin. Dimming Control Using a PWM Signal in CTRL Pin (2) Changing the Effective Feedback Voltage There are three methods to change the effective feedback voltage. First, 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 inte nsity. Comparing with all kinds of PWM signal control, this method features a stable output voltage and LEDs current. Please refer Figure Dimming Control Using DC Voltage. Dimming Control Using DC Voltage AP3019A CTRL up to 2kHz 10 FB AP3019A 90K VDC Effective Feedback Voltage
Document number: DS41298 Rev. 3 - 2 9 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Application Information (Cont.) Second, using a filtered PWM signal can do it. The filtered PWM signal can be considered as a varying and adjustable DC voltage. 10 FB AP3019A 90K PWM 10K C 0.1F Effective Feedback Voltage Dimming Control Using a Filtered PWM Voltage Third, using a logic signal can change the feedback voltage. For example, the FB pin is connected to the GND through a MOSFET and a resistor. And this MOSFET is controlled a logic signal. The luminous intensity of LEDs will be changed when the MOSFET turns on or off. FB AP3019A Logic Signal 2N7002 Effective Feedback Voltage Dimming Control Using Logic Signal
Ordering Information
PackingPackageProduct Name K: SOT-23-6 KT: TSOT-23-6 RoHS/Green G1:RoHS Compliant and Green TR: Tape & Reel Package Temperature Range Part Number Marking ID Packing Type SOT-23-6 -40 to +85C AP3019AKTR-G1 GAS Tape & Reel TSOT-23-6 -40 to +85C AP3019AKTTR-G1 L8E Tape & Reel
Document number: DS41298 Rev. 3 - 2 10 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: SOT-23-6 2.820(0.111) 3.100(0.122) 2.650(0.104) 3.000(0.118) 1.500(0.059) 1.700(0.067) 0.950(0.037)TYP 1.800(0.071) 2.000(0.079) 0.300(0.012) 0.500(0.020) 0.700(0.028)REF 0.100(0.004) 0.200(0.008) 0.200(0.008) 0.300(0.012) 0.600(0.024) 0.000(0.000) 0.150(0.006) 0.900(0.035) 1.300(0.051) 1.450(0.057) MAX 1 2 3 456 Pin 1 Mark
Document number: DS41298 Rev. 3 - 2 11 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT Package Outline Dimensions (All dimensions in mm(inch).) (Cont.) (2) Package Type: TSOT-23-6 2.800(0.110) 3.000(0.118) 1.500(0.059) 1.700(0.067) 2.600(0.102) 3.000(0.118) 0.950(0.037) BSC 1.900(0.075) BSC 0.700(0.028) 0.900(0.035) 0.000(0.000) 0.510(0.020) 0.370(0.015) MIN 0.100(0.004) 0.250(0.010) 0.250(0.010) BSC GAUGE PLANE R0.100(0.004) MIN Pin 1 Dot by Marking 1.000(0.039) MAX
Document number: DS41298 Rev. 3 - 2 12 of 12 www.diodes.com August 2018 © Diodes Incorporated AP3019A NEW PRODUCT IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license unde r its patent or trademark rights, nor the rights of others. Any Customer or user of this do cument or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diod es Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Cust omers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, internation al or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into mul tiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety -critical, life support devices or systems, notwithstanding any devices - or systems -related information or support that may be pr ovided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2018, Diodes Incorporated www.diodes.com