0
登录后你可以
  • 下载海量资料
  • 学习在线课程
  • 观看技术视频
  • 写文章/发帖/加入社区
会员中心
创作中心
发布
  • 发文章

  • 发资料

  • 发帖

  • 提问

  • 发视频

创作活动
MP3383GS-Z

MP3383GS-Z

  • 厂商:

    MPS(美国芯源)

  • 封装:

    SOIC16_150MIL

  • 描述:

    LED 驱动器 IC 4 输出 DC DC 控制器 升压 模拟,PWM 调光 400mA 16-SOIC

  • 数据手册
  • 价格&库存
MP3383GS-Z 数据手册
MP3383 4-String, Max 400mA/String, Max 80V VOUT, Step-Up WLED Controller DESCRIPTION FEATURES The MP3383 is a step-up controller with four LED current channels, designed to drive WLED arrays for large LCD panel backlighting applications. The MP3383 can expand the number of LED channels with two or more ICs in parallel sharing a single power source. • • • • The MP3383 employs peak current control mode with a fixed switching frequency (fSW) that is configurable via an external setting resistor. The MP3383 drives an external MOSFET to boost up the output voltage (VOUT) from a 6V to 33V input voltage (VIN) supply. It also regulates the current in each LED string to the value set by an external current-setting resistor. The MP3383 applies four internal current sources for current balancing. The current matching achieves 1.8% regulation accuracy among strings. The low regulation voltage on the LED current sources reduces power loss. The MP3383 supports direct pulse-width modulation (PWM) dimming as well as analog dimming using a PWM input. Full protection features include over-current protection (OCP), over-temperature protection (OTP), undervoltage protection (UVP), over-voltage protection (OVP), LED short and open protection, and inductor and diode short protection. • • • • • • • • • • 4-String, Max 400mA/String WLED Driver 6V to 33V Input Voltage (VIN) Range 12V Gate Voltage (VGATE) (VIN > 13V) 80V Absolute Maximum Rating for Each String 1.8% Current Matching Accuracy between Each String 3% Current Accuracy Direct PWM Dimming Analog Dimming Mode with PWM Input Cascading Capability with a Single Power Source LED Open and Short Protection Configurable Recoverable Over-Voltage Protection (OVP) Over-Temperature Protection (OTP) Short Inductor and Diode Protection Available in SOIC-16 and TSSOP-16EP Packages APPLICATIONS • • • Desktop LCD Flat-Panel Displays All-in-One PCs 2D and 3D LCD TVs All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS,” the MPS logo, and “Simple, Easy Solutions” are trademarks of Monolithic Power Systems, Inc. or its subsidiaries. The MP3383 is available in SOIC-16 and TSSOP-16EP packages. MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 1 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER TYPICAL APPLICATION L1 D1 VIN VOUT C2 C1 GND R5 R4 C4 8 R3 9 COMP GND OSC OVP EN 14 PWM ADIM R6 10 R1 3 7 MP3383 LED1 LED2 16 M1 LED3 LED4 ISET 1 String 4 15 ISENSE VCC 11 String 3 12 GATE String 2 C3 VIN String 1 13 2 4 5 6 R2 MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 2 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER ORDERING INFORMATION Part Number* MP3383GS* MP3383GF** Package SOIC-16 TSSOP-16EP Top Marking See Below See Below MSL Rating 2 2a * For Tape & Reel, add suffix -Z (e.g. MP3383GS-Z). Contact the factory for sample and production. ** For Tape & Reel, add suffix -Z (e.g. MP3383GF-Z). TOP MARKING (MP3383GS) TOP MARKING (MP3383GF) MPS: MPS prefix YY: Year code WW: Week code MP3383: Part number LLLLLL: Lot number MPS: MPS prefix YY: Year code WW: Week code MP3383: Part number LLLLLLLLL: Lot number PACKAGE REFERENCE TOP VIEW LED1 1 16 PWM LED4 1 16 LED3 LED2 2 15 COMP ISET 2 15 GND 3 14 ADIM OVP 3 14 LED3 4 13 VIN OSC 4 13 LED4 5 12 VCC EN 5 12 ISET 6 11 ISENSE 6 11 COMP OVP 7 10 ISENSE GATE 7 10 ADIM OSC 8 EN VCC 8 9 Exposed Pad Connect to GND 9 TSSOP-16EP MP3383 Rev. 1.0 5/2/2022 VIN SOIC-16 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 3 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER PIN FUNCTIONS TSSOP-16EP SOIC-16 Pin # Pin # 1 13 2 14 3 15 4 16 5 1 6 2 7 3 8 4 9 5 10 6 11 7 12 8 13 9 14 10 15 11 16 12 / MP3383 Rev. 1.0 5/2/2022 Name Description LED string 1 current input. Connect the LED1 pin to the LED string 1 cathode. LED string 2 current input. Connect the LED2 pin to the LED string 2 LED2 cathode. GND Ground. LED string 3 current input. Connect the LED3 pin to the LED string 3 LED3 cathode. LED string 4 current input. Connect the LED4 pin to the LED string 4 LED4 cathode. LED current setting. Connect a current-setting resistor from the ISET pin to ISET GND to configure the current in each LED string. Output over-voltage protection (OVP) setting. Connect a resistor divider OVP from the output to the OVP pin to configure the OVP threshold. Switching frequency (fSW) setting. Connect a resistor between the OSC OSC pin and GND to set the step-up converter’s fSW. Enable control input. A voltage exceeding 1.2V turns the part on; a voltage EN below 0.4V turns the part off. Do not float the EN pin. Current-sense input. During normal operation, the ISENSE pin senses the voltage across the external inductor current-sense resistor (RSENSE) for peak ISENSE current control mode. ISENSE also limits the inductor current (IL) during each switching cycle. For cascading applications, connect the slave IC’s ISENSE to GND. Do not float ISENSE. Step-up converter MOSFET driver output. The GATE pin drives the GATE external power N-channel MOSFET. The internal 12V linear regulator output. The VCC pin provides the power VCC supply for the external MOSFET gate driver and the internal control circuitry. Bypass VCC to GND using a ceramic capacitor. VIN Supply input. The VIN pin must be bypassed locally. Input signal for analog brightness control. The LED current amplitude is determined by the duty cycle of the PWM signal applied to the ADIM pin. An internal RC filter (10MΩ resistor and 100pF capacitor) is integrated into ADIM ADIM. A frequency exceeding 20kHz is recommended to achieve better PWM signal filtering performance and ensure that the high-level ADIM voltage (VADIM) exceeds 1.2V and the low-level VADIM is below 0.4V. Step-up converter compensation. The COMP pin compensates for the COMP regulation control loop. Connect a ceramic capacitor or a resistor combined with a capacitor from COMP to GND. Input signal for PWM brightness control. By applying a PWM signal on this pin, the LED current is chopped, and the average current is equal to ISET x DDIM, where ISET is the LED current value set by a resistor between the ISET PWM pin and GND, and DDIM is the PWM input signal’s duty cycle. Ensure that the high-level voltage exceeds 1.2V and the low-level voltage is below 0.4V. If the PWM pin is floating, weakly pull it to GND internally. EP Exposed pad. Connect the exposed pad to GND. LED1 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 4 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER θJA θJC ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance (4) VIN .................................................-0.3V to +37V VCC, VGATE......................................-0.3V to +16V VLED1 to VLED4 .................................-0.3V to +80V All other pins ................................-0.3V to +6.5V Continuous power dissipation (TA = 25°C) (2) TSSOP-16EP ........................................... 2.78W SOIC-16 ................................................... 1.56W Junction temperature ................................150°C Lead temperature .....................................260°C Storage temperature ................ -60°C to +150°C TSSOP-16EP ......................... 45 ...... 10 ... °C/W SOIC-16…………………………..80……35....°C/W ESD Ratings Human body model (HBM) ........................ ±2kV Charged device model (CDM) ................. ±750V Recommended Operating Conditions (3) Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ (MAX), the junction-toambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX) - TA) / θJA. Exceeding the maximum allowable power dissipation can produce an excessive die temperature, which may cause the regulator to go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, a 4-layer PCB. 5) Not tested in production. Guaranteed by characterization. Supply voltage (VIN) ............................ 6V to 33V Max LED current ................................. 400mA (5) Operating junction temp ........... -40°C to +125°C MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 5 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER ELECTRICAL CHARACTERISTICS VIN = 15V, VEN = 5V, TA = 25°C, unless otherwise noted. Parameters General Operating input voltage Quiescent supply current Shutdown supply current Low-dropout (LDO) output voltage VCC under-voltage lockout (UVLO) threshold VCC UVLO hysteresis threshold Enable (EN) high threshold EN low threshold Step-Up Converter Gate driver sourcing impedance Gate driver sinking impedance Switching frequency OSC pin voltage Maximum duty cycle Cycle-by-cycle ISENSE current limit Latch-off ISENSE current limit COMP source current limit COMP sink current limit COMP transconductance Current Dimming PWM input low threshold PWM input high threshold ADIM input low threshold ADIM input high threshold Current Regulation ISET pin voltage LEDx average current Current matching (6) LEDx regulation voltage MP3383 Rev. 1.0 5/2/2022 Symbol Condition Min Typ Max Unit 3 33 4 1 V mA μA VIN IQ IST VIN = 15V, no switching VEN = 0V, VIN = 15V VCC 13V < VIN, 0 < ICC < 10mA 10.5 12 13.5 V Rising edge 4.5 5 5.5 V VCC_UVLO 6 500 VEN_HIGH VEN_LOW VEN rising VEN falling 1.2 0.4 VCC = 12V,VGATE = 12V VCC = 12V, IGATE = 10mA fSW VOSC DMAX V V 4 Ω 3.4 Ω ROSC = 100kΩ ROSC = 100kΩ, fSW = 500kHz ROSC = 100kΩ, fSW = 500kHz 450 0.75 89 500 0.8 Duty = 89% 160 200 mV 500 75 15 400 mV μA μA μA/V ICOMP_SOLI ICOMP_SILI GCOMP 1V < COMP < 2.7V 1V < COMP < 2.7V ΔICOMP = ±10µA VPWM_LO VPWM_HI VADIM_LO VADIM_HI VPWM falling VPWM rising VADIM falling VADIM rising VISET ILED mV RISET = 13.33kΩ, analog and PWM dimming duty cycle = 100% RISET = 12kΩ, PWM dimming duty cycle = 100%, analog dimming duty cycle = 5% RISET = 13.33kΩ, analog and PWM dimming duty cycle = 100%, ILED = 90mA RISET = 12kΩ, PWM dimming duty cycle = 100%, analog dimming duty cycle = 5%, ILED = 5mA ILED = 100mA ILED = 300mA 550 0.85 0.4 1.2 0.4 1.2 kHz V % V V V V 1.17 1.2 1.23 V 87 90 93 mA 5 6 7 mA 1.8 % 5.5 % 250 450 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. mV mV 6 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER ELECTRICAL CHARACTERISTICS (continued) VIN = 15V, VEN = 5V, TA = 25°C, unless otherwise noted. Parameters Protections Over-voltage protection (OVP) threshold OVP UVLO threshold LEDx UVLO threshold LEDx over-voltage (OV) threshold Thermal protection threshold (7) Thermal protection hysteresis (7) Symbol Condition VOVP_OV VOVP_UVLO VLEDx_UVLO Typ Max Unit 1.85 2 2.15 V Step-up converter fails VLEDx_OV TST Min 50 100 14 Rising edge 18 mV mV 22 150 25 V °C °C Note: 6) 7) Matching is defined as the difference between the maximum and minimum current divided by 2 times the average current. Not tested in production. Guaranteed by characterization. MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 7 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER TYPICAL PERFORMANCE CHARACTERISTICS VIN = 15V, VEN = 5V, 120mA/string, 4 strings, 14 LEDs in series, TA = 25°C, unless otherwise noted. Analog Dimming 500 450 400 350 300 250 200 150 100 50 0 ILED (mA) ILED (mA) PWM Dimming FPWM=200Hz FPWM=20kHz 0 10 20 30 40 50 60 70 80 90 100 DUTY (%) MP3383 Rev. 1.0 5/2/2022 500 450 400 350 300 250 200 150 100 50 0 FADIM=20kHz 0 10 20 30 40 50 60 70 80 90 100 DUTY (%) MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 8 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 15V, VEN = 5V, 120mA/string, 4 strings, 14 LEDs in series, TA = 25°C, unless otherwise noted. Steady State Start-Up through VIN CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH3: IL CH3: IL CH4: ILED CH4: ILED Shutdown through VIN Start-Up through EN CH1: VSW CH1: VSW CH2: VIN CH2: VEN CH3: IL CH3: IL CH4: ILED CH4: ILED Start-Up through PWM Shutdown through EN CH1: VSW CH2: VEN CH3: IL CH4: ILED MP3383 Rev. 1.0 5/2/2022 fPWM = 200Hz, DPWM = 50% CH1: VSW CH2: PWM CH3: IL CH4: ILED MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 9 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 15V, VEN = 5V, 120mA/string, 4 strings, 14 LEDs in series, TA = 25°C, unless otherwise noted. Shutdown through PWM Start-Up through ADIM fPWM = 200Hz, DPWM = 50% fADIM = 20kHz, DADIM = 50% CH1: VSW CH1: VSW CH2: PWM CH2: ADIM CH3: IL CH3: IL CH4: ILED CH4: ILED Shutdown through ADIM PWM Dimming fADIM = 20kHz, DADIM = 50% fPWM = 200Hz, DPWM = 50% CH1: VSW CH1: VSW CH2: ADIM CH2: PWM CH3: IL CH3: IL CH4: ILED CH4: ILED PWM Dimming Analog Dimming fPWM = 200Hz, DPWM = 0.1% fADIM = 20kHz, DADIM = 50% CH1: VSW CH1: VSW CH2: PWM CH2: ADIM CH3: IL CH4: ILED CH3: IL CH4: ILED MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 10 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 15V, VEN = 5V, 120mA/string, 4 strings, 14 LEDs in series, TA = 25°C, unless otherwise noted. Start-Up with One String Open Start-Up with All Strings Open CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH3: IL CH3: IL CH4: ILED CH4: ILED Open One String during Normal Operation Open All Strings during Normal Operation CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH3: IL CH3: IL CH4: ILED CH4: ILED Short One String during Normal Operation Start-Up with One-String Short CH1: VSW CH1: VSW CH2: VLEDx CH2:VLEDx CH3: IL CH3: IL CH4: ILED CH4: ILED MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 11 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 15V, VEN = 5V, 120mA/string, 4 strings, 14 LEDs in series, TA = 25°C, unless otherwise noted. Short Inductor during Normal Operation CH1: VSW Short Diode during Normal Operation CH1: VSW CH2: VOUT CH2: VOUT CH3: ISHORT CH3: ISHORT+L CH4: ILED CH4: ILED OTP and Recovery CH1: VSW CH2: VOUT CH3: IL CH4: ILED MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 12 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER FUNCTIONAL BLOCK DIAGRAM VCC Regulator VIN - Control Logic + PWM Comparator GATE Current-Sense Amplifier ISENSE - GND Over-Voltage Protection Oscillator LEB + - COMP PWM Stop - UP_CLAMP Short-String Protection OVP + ILIMIT - OSC + LED_SHORT + Max - Min Feedback Control EA + ADIM + VREF VREF - LED1 ISET Current Control PWM LED4 ILIMIT EN Enable Control OTP LED_SHORT LED_OPEN Protection Figure 1: Functional Block Diagram MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 13 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER OPERATION The MP3383 is a configurable constantfrequency, peak current control mode, step-up converter with 4-channel regulated current sources to drive an array of up to four white LED strings. Internal 12V Regulator The MP3383 includes an internal linear regulator (VCC). When the input voltage (VIN) exceeds 13V, VCC outputs a 12V power supply to the external MOSFET gate driver and the internal control circuitry. The VCC voltage (VCC) drops to 0V when the chip shuts down. The MP3383 features under-voltage lockout (UVLO). The chip is disabled until VCC exceeds the UVLO threshold. The UVLO hysteresis is approximately 500mV. System Start-Up When enabled, the MP3383 checks the topology connection first by monitoring the over-voltage protection (OVP) pin. This determines whether a Schottky diode is connected or the boost output is shorted to GND. An OVP voltage (VOVP) exceeding 50mV allows the chip to switch normally. Otherwise, switching is disabled. The MP3383 also checks other safety limits after passing the OVP test, including UVLO, overtemperature protection (OTP), and over-current protection (OCP). If all protection tests pass, the chip then begins boosting the step-up converter with an internal soft start (SS). To prevent a large inrush current, the enable (EN) signal should occur after the establishment of VIN and the pulse-width modulation (PWM) dimming signal during the start-up sequence. Step-Up Converter At the beginning of each switching cycle, the internal clock turns on the external MOSFET. During normal operation, the minimum turn-on time of the external MOSFET is around 150ns. Adding a stabilizing ramp to the current-sense amplifier’s output prevents subharmonic oscillations for duty cycles greater than 50%, which is then fed into the PWM comparator. When the summed voltage reaches the error amplifier (EA)’s output voltage (VCOMP), the external MOSFET turns off. MP3383 Rev. 1.0 5/2/2022 VCOMP is an amplified signal of the difference between the reference voltage (VREF) and the feedback voltage (VFB). The converter automatically chooses the lowest active LEDx pin voltage (VLEDx) to provide a sufficient bus voltage to power all LED strings. If VFB drops below VREF, the EA’s output voltage (VCOMP) increases. This results in more current flowing through the MOSFET, increasing the power delivered to the output and forming a closed loop that regulates the output voltage (VOUT). Under light-load operation, especially if VOUT ≈ VIN, the converter runs in pulse-skipping mode. In this mode, the MOSFET turns on for a minimum on time and then the converter discharges the power to the load for the remaining period. The external MOSFET remains off until VOUT must be boosted again. Dimming Control The MP3383 provides two dimming methods: PWM dimming and analog dimming. For PWM dimming, apply a PWM signal to the PWM pin. The LED current (ILED) is chopped by this PWM signal, and the average ILED is equal to ISET x DDIM, where DDIM is the PWM dimming signal’s duty cycle, and ISET is the full-scale ILED set by the ISET resistance (RISET). For analog dimming, apply a PWM signal to the ADIM pin. An internal RC filter (10MΩ resistor and 100pF capacitor) is integrated to ADIM. This PWM signal is filtered to the DC voltage by the internal RC filter. The ILED amplitude is equal to ISET x DDIM, where DDIM is the PWM dimming signal’s duty cycle, and ISET is the full-scale ILED set by RISET. A 20kHz or greater PWM signal is recommended for improved filtering. Operating Switching Frequency (fSW) The MP3383’s switching frequency (fSW) is set through an external resistor on the OSC pin. This helps optimize both the size of the external components and system efficiency. MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 14 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER Open-String Protection Open-string protection is achieved through detecting VOVP and LEDx voltage (VLEDx, where “LEDx” can be LED1, LED2, LED3, and LED4). If one or more strings are open, then the respective LEDx pins are pulled to ground and the IC continues charging VOUT until it reaches the OVP threshold. If the OVP threshold is triggered, then the chip stops switching and marks off the strings for which VLEDx is below 100mV. Once marked, the remaining LED strings force VOUT back to normal regulation. The string with the largest voltage drop determines the output regulation value. The MP3383 always attempts to light at least one string. If all strings are open, the MP3383 shuts down the step-up converter. The open strings remain in this marked-off state until the chip resets. Short-String Protection The MP3383 monitors VLEDx to determine whether a short-string fault has occurred. If one or more strings are short, then the respective LEDx pins tolerate high-voltage stress. If VLEDx exceeds the protection threshold for 16 switching cycles (128 switching cycles, optionally), shortstring protection is triggered, and the fault string is marked off and disabled. Once a string is marked off, it disconnects from the VOUT loop until VIN or EN restarts. To prevent mistriggering a short LED protection when the LED string is open, the short LED MP3383 Rev. 1.0 5/2/2022 protection function is disabled when VLEDx for all used LED channels exceeds 2.1V. For applications where VOUT > 90V, use an external MOSFET to carry the huge voltage when the whole LED string is shorted. Cycle-by-Cycle Current Limit To prevent the external components from exceeding their respective current stress ratings, the IC employs cycle-by-cycle current-limit protection. When the current-sense voltage across the sense resistor (connected between ISENSE and GND) reaches the cycle-by-cycle current-limit threshold, the external MOSFET turns off until the next clock cycle begins. Short Inductor and Diode Protection When the external inductor or diode is shorted, the IC provides protection by detecting the current flowing through the power MOSFET. If the current-sense voltage across the sense resistor (connected between ISENSE and GND) exceeds the latch-off current limit threshold and lasts for five switching cycles, the IC stops switching and latches off. Thermal Shutdown The MP3383 monitors the silicon die temperature to prevent the IC from operating at exceedingly high temperatures. If the die temperature exceeds the threshold (TST), the IC shuts down. Once the die temperature drops below the lower threshold, the IC restarts and resumes normal operation. The hysteresis value is typically 25°C. MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 15 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER APPLICATION INFORMATION Selecting the Switching Frequency (fSW) The step-up converter’s fSW is recommended to be between 100kHz and 900kHz for most applications. A resistor on OSC sets the internal fSW for the step-up converter. fSW can be estimated using Equation (1): fSW (kHz) = 50000 ROSC ( kΩ ) (1) The required inductance (L) can be calculated using Equation (3): L η  VOUT  D  (1− D)2 2  fSW  ILOAD The duty cycle (D) can be calculated using Equation (4): D = 1− For ROSC is 100kΩ, fSW is set to 500kHz. Setting the LED Current The current in each LED string can be set through the current-setting resistor on ISET, which can be calculated using Equation (2): ISET(mA) = 1200 RISET ( kΩ ) (2) For RISET is 12kΩ, ILED is set to 100mA. Do not leave ISET floating. Selecting the Input Capacitor The input capacitor (CIN) reduces the surge current drawn from the input supply and the switching noise from the device. CIN impedance at fSW should be below the input source impedance to prevent the high-frequency switching current from passing through to the input. Ceramic capacitors with X5R or X7R dielectrics are recommended for their low ESR and small temperature coefficients. For most applications, use a 4.7μF ceramic capacitor in parallel with a 220µF electrolytic capacitor. Selecting the Inductor and Current-Sensing Resistor A larger-value inductor results in reduced ripple current and a lower peak inductor current (IL(PEAK)), which reduces stress on the N-channel MOSFET. However, a larger-value inductor has a larger physical size, higher series resistance, and lower saturation current. Choose an inductor that does not saturate under the worst-case load conditions. Select the minimum inductance (L) that ensures the boost converter works in continuous conduction mode (CCM) with high efficiency and good EMI performance. VIN VOUT (4) Where ILOAD is the LED load current, and η is the efficiency. The switching current is used for peak current control mode. To avoid reaching the current limit, the voltage across the sensing resistor (RSENSE) must be below 80% of the current limit voltage (VSENSE) in the worst-case scenario. RSENSE can be calculated using Equation (5): RSENSE = 0.8  VSENSE IL(PEAK) (5) The peak inductor current (IL(PEAK)) can be calculated using Equation (6): IL(PEAK) = VOUT  ILOAD VIN  (VOUT − VIN ) + η  VIN 2  L  fSW  VOUT (6) Selecting the Power MOSFET The MP3383 is capable of driving a wide variety of N-channel power MOSFETs. The critical MOSFET selection parameters include the maximum drain-to-source voltage (VDS(MAX)), maximum current (ID(MAX)), on resistance (RDS(ON)), gate source charge (QGS), gate drain charge (QGD), and total gate charge (QG). Ideally, the off-state voltage across the MOSFET is equal to VOUT. Considering the voltage spike when the MOSFET turns off, VDS(MAX) should be 1.5 times greater than VOUT. The maximum current flowing through the power MOSFET occurs at the minimum VIN and maximum output power (POUT). The maximum RMS current through the MOSFET (IRMS(MAX)) can be calculated using Equation (7): IRMS(MAX) = IIN(MAX)  DMAX MP3383 Rev. 1.0 5/2/2022 (3) MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. (7) 16 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER The maximum duty cycle (DMAX) can be calculated using Equation (8): DMAX  VOUT − VIN(MIN) (8) VOUT The MOSFET’s current rating should be 1.5 times greater than IRMS(MAX). The MOSFET’s RDS(ON) determines the conduction loss (PCOND), which can be calculated using Equation (9): PCOND = IRMS 2  RDS(ON)  k Where k is coefficient. the MOSFET’s (9) temperature The switching loss is related to QGD and QGS, which determine the commutation time. QGS is the charge between the threshold voltage and the plateau voltage when a driver charges the gate, which can be read in the VGS vs. QG chart of the MOSFET datasheet. QGD is the charge during the plateau voltage. These two parameters are required to estimate the turn-on and turn-off losses (PSW), which can be calculated using Equation (10): PSW = QGS  RG  VDS  IIN  fSW + VDR − VTH QGD  RG  VDS  IIN  fSW VDR − VPLT (10) Where VDR is the drive voltage, VTH is the threshold voltage, VPLT is the plateau voltage, VDS is the drain-to-source voltage, and RG is the gate resistance. RG is recommended to be between 10Ω and 20Ω. Note that calculating the switching loss is the most difficult part of loss estimation. Equation (10) provides a simplified equation. For more accurate estimates, the calculations become significantly more complex. The total gate charge (QG) is used to calculate the gate drive loss (PDR). PDR can be calculated using Equation (11): PDR = Q G  VDR  f SW MP3383 Rev. 1.0 5/2/2022 Selecting the Output Capacitor The output capacitor (COUT) keeps the VOUT ripple small and ensures feedback loop stability. COUT impedance must be low at fSW. Ceramic capacitors with X7R dielectrics are recommended for their low ESR characteristics. A 4.7μF ceramic capacitor in parallel with a 22μF to 47μF electrolytic capacitor is sufficient for most applications. Setting the Over-Voltage Protection (OVP) Open-string protection is achieved by detecting VOVP. In some cases, an LED string open fault results in VFB always being 0V. The MP3383 continues boosting VOUT higher and higher. If VOUT reaches the configured OVP threshold, OVP is triggered. To ensure that the chip functions properly, an appropriate VOVP is required. The recommended VOVP is about 1.1 to 1.2 times greater than VOUT for normal operation. VOVP is set by an external resistor on OVP, and can be calculated using Equation (12): VOVP = 2(V)  (1 + RHIGH ) RLOW (12) Where RHIGH and RLOW are the voltage divider resistors between VOUT and GND. Expanding LED Channels The MP3383 can expand the number of LED channels by using two or three ICs in parallel. To connect two ICs for a total of eight LED strings, connect the VCC pins of the master IC and the slave IC together to power the slave IC’s internal logic circuitry. Connect the COMP pins of the slave IC and the master IC together to regulate the voltage of all eight LED strings. The slave IC’s MOSFET driving signal is not used. The boost converter can be driven by the master IC only. Do not leave the slave IC’s ISENSE pin floating; connect it to ground. Apply the EN and DIM signals to both ICs. (11) MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 17 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER PCB Layout Guidelines Efficient PCB layout is critical for stable operation and reducing EMI noise. For the best results, follow the guidelines below and refer to Figure 2: 1. Ensure that the loop between the external MOSFET, output diode, and ceramic COUT is as small and short as possible since it carries a high-frequency pulse current. 2. Separate the power ground (PGND) and signal ground (GND) to reduce noise affection. Figure 2: Recommended PCB Layout 3. Connect PGND and GND together. All logic signals refer to the signal ground. 4. Place ceramic capacitors as close to VIN and VCC as possible. MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 18 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER TYPICAL APPLICATION CIRCUIT 0Ω R4 10Ω 1 U1 C10 0.47μF AGND C12 AGND EN 1 R9 R22 R11 2kΩ R12 200kΩ 100kΩ AGND ADIM 1 R21 C13 NC 2kΩ 9 VIN 8 VCC 470nF 270Ω 11 R17 C14 10kΩ NC 4 GATE 7 ISENSE 6 COMP MP3383 OSC R5 R6 0.05Ω 1 NC R8 0Ω PGND AGND NC OVP 3 R13 2kΩ 13 10 ADIM LED2 14 2 ISET LED3 16 12 PWM LED4 1 2 1 22μF/100V 316kΩ C8 C9 PGND R7 10kΩ 100pF 2.2μF/100V C11 15 PGND LED+ C4 NC GND LED1 R3 C7 PGND EN 5 NC 2 C6 PGND R1 M1 R2 NC PGND 2.2μF/100V 3 1 1 1 2 NC 220μF/35V C1 B290 2 33μH/5A C5 GND 1 1 C3 FDD861 02LZ/AM4490N 2 2 L1 1 2 2 2 1 4.7μF/50V 1 F1 1 D1 TO-252 or SO8 C2 VIN AGND R14 0Ω R15 0Ω 1 1 1 1 LED1 LED2 LED3 LED4 R16 0Ω R18 0Ω R10 100kΩ PWM-DIM 1 R20 R19 AGND 100kΩ 2kΩ Figure 3: Typical Application Circuit (8) Note: 8) Some components are adjustable based on real cases. MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 19 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER PACKAGE INFORMATION PACKAGE OUTLINE DRAWING FOR 16-TSSOP w/ EXPOSED PADDLE MF-PO-D-0036 revision 3.0 TSSOP-16EP PIN 1 ID TOP VIEW RECOMMENDED LAND PATTERN SEE DETAIL "A" FRONT VIEW SIDE VIEW DETAIL "A" NOTE: BOTTOM VIEW MP3383 Rev. 1.0 5/2/2022 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WITDH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING CONFORMS TO JEDEC MO-153, VARIATION ABT. 6) DRAWING IS NOT TO SCALE. MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 20 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER PACKAGE INFORMATION (continued) SOIC-16 MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 21 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER CARRIER INFORMATION 1 Pin1 1 1 1 ABCD ABCD ABCD ABCD Feed Direction Part Number MP3383GS-Z MP3383GF-Z MP3383 Rev. 1.0 5/2/2022 Package Description SOIC-16 TSSOP-16EP Quantity/ Reel 2500 2500 Quantity/ Tube 50 96 Reel Diameter 13in 13in Carrier Tape Width 16mm 16mm MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. Carrier Tape Pitch 8mm 8mm 22 MP3383 – 4-STRING, MAX 80V VOUT, STEP-UP WLED CONTROLLER REVISION HISTORY Revision # 1.0 Revision Date 5/2/2022 Description Initial Release Pages Updated - Notice: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third-party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP3383 Rev. 1.0 5/2/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 23
MP3383GS-Z 价格&库存

很抱歉,暂时无法提供与“MP3383GS-Z”相匹配的价格&库存,您可以联系我们找货

免费人工找货