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MP24894规格书

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  • 日期: 2016-11-03
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标签: MP24894规格书

MP24894规格书,支持PWM

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MP24894 StepDown WLEDCurrent Controller with Wide 6V to 60V Input Voltage The Future of Analog IC Technology It is designed to operate that accurately DESCRIPTION The MP24894 is a highefficiency stepdown controller in continuous current mode CCM to power LEDs of highbrightness with a wide input voltage range of 6V to 60V The MP24894 employs a hysteretic control architecture regulates LED current with a feedback coming from an external highside curren......

MP24894 Step-Down WLED-Current Controller with Wide 6V to 60V Input Voltage The Future of Analog IC Technology It is designed to operate that accurately DESCRIPTION The MP24894 is a high-efficiency step-down controller. in continuous current mode (CCM) to power LEDs of high-brightness with a wide input voltage range of 6V to 60V. The MP24894 employs a hysteretic control architecture regulates LED current with a feedback coming from an external high-side current-sense resistor. This control scheme optimizes circuit stabilization and fast response time without loop compensation. Its low 200mV average feedback voltage reduces power the converter’s efficiency. The MP24894 implements PWM and analog dimming together through the EN/DIM pin. The MP24894 protection in case of output overload. The MP24894 is available in TSOT6 package. thermal overload loss and improves includes FEATURES • Wide 6V to 60V Input Range • Able to Drive >1A LED Load • Hysteresis Control • High Efficiency (>95%) • 2500:1 PWM Dimming Ratio • Open LED Protection • Short LED Protection • Thermal Shutdown APPLICATIONS • Low Voltage Halogen Replacement • Low Voltage General Illumination • Automotive/Decorative LED Lighting • Signs/Emergency Lighting • LED Backlighting All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VIN 6V-60V D1 RSENSE CIN IN VCC EN/DIM RS MP24894 GND DR L1 MP24894 Rev 1.01 12/20/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2012 MPS. All Rights Reserved. 1 MP24894 – STEP-DOWN LED-CURRENT CONTROLLER WITH WIDE 6V TO 60V INPUT VOLTAGE ORDERING INFORMATION Part Number* MP24894GJ Package TSOT6 Top Marking ACG * For Tape & Reel, add suffix –Z (e.g. MP24894GJ–Z); PACKAGE REFERENCE IN RS EN/DIM 1 2 3 TSOT6 6 5 4 VCC DR GND ABSOLUTE MAXIMUM RATINGS (1) VIN .................................................-0.3V to +65V VRS ..............................................(VIN - 5V) to VIN All Other Pins...............................-0.3V to +6.5V Continuous Power Dissipation (TA = 25°C) (2) TSOT6 ..................................................... 1.25W Junction Temperature...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C Recommended Operating Conditions (3) Supply Voltage VIN ..............................6V to 60V Operating Junction Temp. (TJ). -40°C to +125°C θJA θJC Thermal Resistance (4) TSOT6 ..................................100 ..... 55... °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the the maximum junction-to-ambient 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 will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. temperature TJ(MAX), 3) The device is not guaranteed to function outside of its junction operation conditions. 4) Measured on JESD51-7, 4-layer PCB. MP24894 Rev 1.01 12/20/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2012 MPS. All Rights Reserved. 2 MP24894 – STEP-DOWN LED-CURRENT CONTROLLER WITH WIDE 6V TO 60V INPUT VOLTAGE ELECTRICAL CHARACTERISTICS VIN = 24V, TA = 25°C, unless otherwise noted. Parameter Input voltage Shutdown supply current Quiescent supply current VIN ISD IQ No Switching Symbol Condition VCC voltage Feedback average voltage (with respect to VIN) Feedback reference voltage hysterisis EN/DIM enable high voltage EN/DIM enable hysterisis EN/DIM pull-up current EN/DIM pull-down current Min recommended pwm dimming frequency Max recommended pwm dimming frequency Gate driver source resistor Gate driver sink resistor Gate driver output-voltage high Gate driver output-voltage low Minimum on time Minimum off time Recommended maximum operating frequency UVLO threshold voltage(VCC) UVLO hysteresis Thermal shutdown threshold Thermal shutdown hysteresis Vcc VEN/DIM = 3.5V VIN-VRS VEN/DIM = 3.5V VFB_HYS VEN_HIGH VEN Rising VEN_HYS Pull up to 5V Pull down to GND FPWMmin FPWMmax R_source VGS = 5.5V R_sink VOH VOL IDRV = 10mA IDRV = 10mA TON_MIN Guarantee by Designer TOFF_MIN Guarantee by Designer FMAX VUVLOTH VCC Rising VUVLOHYS Temp Rising Guarantee by Designer Min 6 5.5 194 20 5.5 Typ 80 0.3 6 Max 60 108 0.5 200 206 ±30 0.29 50 2.8 25 0.1 20 6 2 100 100 1 5.6 0.4 150 20 0.34 80 0.5 Units V µA mA V mV mV V mV μA μA kHz kHz Ω Ω V V ns ns MHz V V °C °C MP24894 Rev 1.01 12/20/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2012 MPS. All Rights Reserved. 3 MP24894 – STEP-DOWN LED-CURRENT CONTROLLER WITH WIDE 6V TO 60V INPUT VOLTAGE TYPICAL CHARACTERISTICS VCC Voltage vs. Temperature EN UVLO vs. Temperature ) V ( E G A T L O V C C V 6.45 6.4 6.35 6.3 6.25 6.2 6.15 6.1 6.05 6 -50 VCC UVLO vs. Temperature 5.71 5.7 5.69 5.68 5.67 5.66 5.65 ) V ( O L V U C C V ) V ( O L V U N E 0.288 0.287 0.286 0.285 0.284 0.283 0.282 0.281 0.28 0.279 0.278 0 50 100 150 5.64 -50 0 50 100 150 -50 0 50 100 150 Feedback Reference Voltage Valley 169.6 169.4 169.2 169.0 168.8 168.6 ) V E C N E R E F E R K C A B D E E F ( Y E L L A V E G A T L O V Feedback Reference Voltage Peak 227.2 227.0 226.8 226.6 226.4 226.2 E C N E R E F E R K C A B D E E F ) V ( K A E P E G A T L O V 168.4 -50 0 50 100 150 226.0 -50 0 50 100 150 MP24894 Rev 1.01 12/20/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2012 MPS. All Rights Reserved. 4 MP24894 – STEP-DOWN LED-CURRENT CONTROLLER WITH WIDE 6V TO 60V INPUT VOLTAGE TYPICAL PERFORMANCE CHARACTERISTICS Performance waveforms are tested on the evaluation board of the Design Example section. VIN = 24V, 3LEDs, IOUT = 1A, TA = 25°C, unless otherwise noted. Efficiency Steady State Input Power On 100 95 90 85 80 75 70 65 60 VSW 20V/div. VIN 10V/div. VEN 5V/div. ILED 1A/div. VSW 20V/div. VGATE 5V/div. VEN 5V/div. ILED 1A/div. VSW 20V/div. VGATE 5V/div. IL 500mA/div. 10 20 30 40 50 60 VSW 20V/div. VIN 10V/div. VEN 5V/div. ILED 1A/div. Input Power Off EN Power On EN Power Off VSW 20V/div. VGATE 5V/div. VEN 5V/div. ILED 1A/div. VSW 20V/div. VEN 5V/div. VGATE 5V/div. ILED 1A/div. VSW 20V/div. VGATE 5V/div. VEN 5V/div. ILED 1A/div. VSW 20V/div. VGATE 5V/div. VLED- 10V/div. IL 1A/div. Short LED+ to LED- Protection MP24894 Rev 1.01 12/20/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. www.MonolithicPower.com © 2012 MPS. All Rights Reserved. 5
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