AP3031 DIODES | Alldatasheet
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Technical content
Features
Up to 92% Efficiency (VIN = 9V, IOUT = 260mA) Up to 84% Efficiency (VIN = 5V, IOUT = 260mA) Fast 1MHz Switching Frequency Wide Input Voltage Range: 2.7V to 16V Low 200mV Feedback Voltage Output Overvoltage Protection Cycle by Cycle Current Limit: 1.4A Built-in Soft-Start Built-in Standby Mode to Achieve High Frequency PWM Dimming Built-in Thermal Shutdown Function Undervoltage Lockout Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/ Pin Assignments (Top View) 3 4 Pin 1 Mark 6SW GND FB CTRL VIN OV SOT-23-6
Applications
7' to 10' LCD panels Digital photo frames GPS receivers EPC PDVD Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS ), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant . 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen - and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlori ne (<1500ppm total Br + Cl) and <1000ppm antimony compounds .
Document number: DS41442 Rev. 2 - 2 2 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Typical Applications Circuit FB AP3031 GND VIN SW CTRL CIN 10F COUT 0.47F VIN 5V VOUT L 4.7H RISET 3*13 On/Off D OV 3 х 3 WLEDs CIN R4 R2 VIN SW CTRL GND FB OV VIN 12V VOUT 18V COUT AP3031 Booster for LNB Application (Note 4) AP3031 CIN VIN SW CTRL GND FB OV VIN 3.6V VOUT COUT Booster for Portable Charger Application (Note 4) Note: 4. VOUT = (1+R1/R2)*VFB.
Document number: DS41442 Rev. 2 - 2 3 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Pin Description Pin Number Pin Name Function 1 SW Switch Pin. Connect external inductor and Schottky. 2 GND Ground Pin. 3 FB Voltage Feedback Pin. Reference voltage is 200mV.
4 CTRL
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 0.7ms and then the IC is enabled, the AP3031 will soft start to protect system departments. If logic low time is less than about 0.7ms and then the IC is enabled, the AP3031 will hold on standby mode and start directly to achieve high frequency dimming. 5 OV Overvoltage Protection Input Pin. Connect to the output directly. On OVP condition, the output voltage will be clamped. 6 VIN Input Supply Pin. Must be locally bypassed. Functional Block Diagram 1MHz OSCILLATOR RAMP GENERATOR VREF DRIVER 1.25 V COMPARATOR 200 mV SOFT START VIN CTRL FB GND SW STANDBY OV To Control Logic CONTROL LOGIC OVER TEMPERATURE DETECTOR OV Absolute Maximum Ratings (Note 5) 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) 600 V — ESD (Human Body Model) 4000 V Note: 5. Stresses greater than those listed under Absolute Maximum Ratings can 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 can affect device reliability.
Document number: DS41442 Rev. 2 - 2 4 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Recommended Operating Conditions Symbol Parameter Min Max Unit TOP Operating Temperature Range -40 +85 °C VIN Input Voltage 2.7 16 V VCTRL CTRL Pin Voltage — 16 V Electrical Characteristics (@VIN = 5.0V, VCTRL = 5.0V, TA = +25°C, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit VIN Operating Voltage — 2.7 — 16 V VFB Feedback Voltage (Note 6) IOUT = 20mA, 3 LEDs TA = -40°C to +85°C 188 200 212 mV IFB FB Pin Bias Current — — 35 100 nA IQ Quiescent Current VFB = VIN, No Switching 3.0 4.0 5.0 mA ISHDN Shutdown Quiescent Current VCTRL = 0V 20 50 80 µA f Switching Frequency — 0.75 1 1.3 MHz DMAX Maximum Duty Cycle — 90 93 — % ILIMIT Switch Current Limit (Note 7) D = 60% 1.2 1.4 — A VCESAT Switch VCE Saturation Voltage ISW = 0.6A — 300 — mV — Switch Leakage Current VSW = 16V — 0.01 5 µA VCTRL CTRL Pin Voltage Active High 1.8 — — V Active Low — — 0.5 ICTRL CTRL Pin Bias Current — 35 60 85 µA VOVP OVP Voltage — 15.5 17.5 19.5 V tSS Soft-Start Time — — 250 — µs tSTB Standby Time — — 0.7 — ms TOTSD Thermal Shutdown — — +155 — °C JC Thermal Resistance (Junction to Case) — — 60 — °C/W Notes: 6. The bold type specifications of full temperature range are guaranteed by desig n (GBD). 7. The switch current limit is related to duty cycle. Please refer to Figure Switch Current Limit vs. Duty Cycle for detail.
Document number: DS41442 Rev. 2 - 2 5 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Performance Characteristics (WLED forward voltage (VF) = 3.2V at IF = 20mA, unless otherwise noted.) Efficiency vs. Output Current Efficiency vs. Input Voltage Minimum Operating Voltage vs. Temperature Quiescent Current vs. Input Voltage Shutdown Quiescent Current vs. Input Voltage CTRL Pin Voltage vs. Temperature 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 Efficiency (%) Output Current (mA) VIN=5V, VOUT=10V, TA=+25 o C CIN=10F, COUT=0.47F, L=4.7H Efficiency (%) Input Voltage (V) VOUT=10V, IOUT=260mA,TA=+25 o C CIN=10F, COUT=0.47F, L=4.7H -60 -40 -20 0 20 40 60 80 100 120 140 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 Minimum Operating Voltage (V) Temperature ( o 2 4 6 8 10 12 14 16 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Quiescent Current (mA) Input Voltage (V) TA= -40 o C TA= +25 o C TA= +85 o C 2 4 6 8 10 12 14 16 Shutdown Quiescent Current (A) Input Voltage (V) TA= -40 o C TA= +25 o C TA= +85 o C -60 -40 -20 0 20 40 60 80 100 120 140 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 CTRL Pin Voltage (V) Temperature ( o
Document number: DS41442 Rev. 2 - 2 6 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Performance Characteristics (WLED forward voltage (VF) = 3.2V at IF = 20mA, unless otherwise noted.) (continued) CTRL Pin Current vs. CTRL Pin Voltage Feedback Voltage vs. Temperature Frequency vs. Temperature OVP Voltage vs. Temperature Frequency vs. Input Voltage Switch Current Limit vs. Duty Cycle 2 4 6 8 10 12 14 16 18 100 120 140 160 180 200 220 CTRL Pin Current (A) CTRL Pin Voltage (V) -60 -40 -20 0 20 40 60 80 100 120 140 188 190 192 194 196 198 200 202 204 206 208 210 212 Feedback Voltage (mV) Temperature ( o IOUT= 20mA -60 -40 -20 0 20 40 60 80 100 120 140 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 Frequency (MHz) Temperature ( o -60 -40 -20 0 20 40 60 80 100 120 140 OVP Voltage (V) Temperature ( o 2 4 6 8 10 12 14 16 18 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 Frequency (MHz) Input Voltage (V) 10 20 30 40 50 60 70 80 90 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 Switch Current Limit (A) Duty Cycle (%) TA=-40 o C TA=+25 o C TA=+85 o C
Document number: DS41442 Rev. 2 - 2 7 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Performance Characteristics (WLED forward voltage (VF) = 3.2V at IF = 20mA, unless otherwise noted.) (continued) Switch Saturation Voltage vs. Switch Current Case Temperature vs. Output Current
Application Information
The AP3031 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 Function Block Diagram and Typical Applications Circuit. At the start of each oscillator cycle, switch Q1 turns on. The switch current will inc rease 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 n on-inversion 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. 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 voltage of 200mV. S o, a constant output current can be provided by this operation mode. LED Current Control Refer to Typical Applications Circuit, the LED current is controlled by the feedback resistor R ISET. LEDs' current accuracy is determined by the feedback voltage and resistor R ISET, so the precise resistors are preferred. The resistance of R ISET 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: LED ISET I mVR 200 Overvoltage Protection The AP3031 has an internal open load protection circuit. When the LEDs are disconnected from circuit or fail open, the output voltage is clamped at about 17.5V. The AP3031 will switch at a low frequency, and minimize current to avoid input voltage drop. Soft-Start The AP3031 has an internal soft start circuit to limit the inrush current dur ing startup. If logic low time on CTRL pin is more than about 0.7ms and then the IC is enabled, the AP3031 will start smoothly to protect the supplier. The time of startup is controlled by internal soft -start capacitor. For details please refer to the Figure of Soft-Start Waveform. 100 150 200 250 300 350 400 450 500 550 600 650 Switch Saturation Voltage (mV) Switch Current (A) TA=-40 o C TA=+25 o C TA=+85 o C 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 Case Temperature ( o Output Current (mA) VIN=5V, VOUT=10V, TA=+25 o C CIN=10F, COUT=0.47F, L=4.7H
Document number: DS41442 Rev. 2 - 2 8 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Application Information (continued) Soft-Start Waveform VIN = 5V, 3x 13 LEDs, ILED = 260mA Standby and Dimming To avoid audio noise and achieve high frequency dimming, AP3031 is equipped with s tandby function. If logic low time on CTRL pin is less than about 0.7ms and then the IC is enabled, the AP3031 will hold on standby mode and start directly to achieve high frequency dimming. For details please refer to the Figure of Standby Waveform. Standby Waveform Two typical types of dimming control circuit are present as below. First, control ling CTRL pin voltage to change operation state 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 AP3031 is turned on and off by this signal. When the PWM frequency is lower than 1kHz (Typ.), the IC works in the soft -start mode to dimming the light. On contrary, when the PWM frequency is higher than 1kHz (Typ.), the IC works in the standby mode: the converter ceaselessly switches off and directly starts to achieve light dimming. This standby function allows AP303 1 to supp ort high frequency dimming (up to 25kHz or higher) to avoid audio noise. For more details please refer to the Figure of Dimming Control Using a PWM Signal in CTRL Pin and the Figure of High Frequency (25kHz) Dimming Waveform. AP3031 CTRL Dimming Control Using a PWM Signal in CTRL Pin
Document number: DS41442 Rev. 2 - 2 9 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Application Information (continued) High Frequency (25kHz) Dimming Waveform (2) Changing the Effective Feedback Voltage There are two popular 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 intensity. Comparing with all kinds of PWM signal control, this method features a stable output voltage and LEDs current. Please refer to the Figure of Dimming Control Using DC Voltage. FB AP3031 R2R3 VDC Effective Feedback Voltage Dimming Control Using DC Voltage Second, using a filtered PWM signal can do it. The filtered PWM signal can be considered as a varying and adjustable DC voltage. Please refer to the Figure of Dimming Control Using Filtered PWM Voltage. FB AP3031 R2R3 PWM R4 C Effective Feedback Voltage Dimming Control Using Filtered PWM Voltage
Document number: DS41442 Rev. 2 - 2 10 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031
Ordering Information
PackingPackageProduct Name K: SOT-23-6 RoHS/Green G1: GreenTR: Tape & Reel Part Number Package Temperature Range Identification Code Packing Qty. Carrier AP3031KTR-G1 SOT-23-6 -40 to +85°C GEC 3000 Tape & Reel Marking Information 1 2 3 XX Y W X XX : Identification Code Y : Year 0~9 X : Internal Code ( Top View ) W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week Part Number Package Identification Code AP3031KTR-G1 SOT-23-6 GEC XXX : Identification Code Y : Year 0 to 9 (ex: 2 = 2022) W : Week : A to Z : week 1 to 26 a to z : week 27 to 52; z represents week 52 and 53 X : Internal Code XXX Y W X
Document number: DS41442 Rev. 2 - 2 11 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Package Outline Dimensions (All dimensions in mm(inch).) Please see http://www.diodes.com/package-outlines.html for the latest version. SOT-23-6
Document number: DS41442 Rev. 2 - 2 12 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. SOT-23-6 Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) E (mm)/(inch) Mechanical Data Moisture Sensitivity: Level 3 per JESD22-A113 Terminals: Matte Tin Plated Leads, Solderable per M2003 JESD22-B102 Weight: 0.016 grams (Approximate)
Document number: DS41442 Rev. 2 - 2 13 of 13 www.diodes.com December 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AP3031 IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is fo r informational purpose only and is provided only to illustrate the operation of Diodes ’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diode s’ products. 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