UC1846MDWREP

UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 FEATURES • • • • • • • • • • • • • • • (1) Controlled Baseline – One Assembly/Test Site, One Fabrication Site Extended Temperature Performance of –55°C to 125°C Enhanced Diminishing Manufacturing Sources (DMS) Support Enhanced Product-Change Notification Qualification Pedigree (1) Automatic Feed-Forward Compensation Programmable Pulse-by-Pulse Current Limiting Automatic Symmetry Correction in Push-Pull Configuration Enhanced Load-Response Characteristics Parallel Operation Capability for Modular Power Systems Differential Current-Sense Amplifier With Wide Common-Mode Range Double Pulse Suppression 500-mA (Peak) Totem-Pole Outputs ±1% Bandgap Reference Undervoltage Lockout • • • Soft-Start Capability Shutdown Terminal 500-kHz Operation DW PACKAGE (TOP VIEW) C/S SS VREF Shutdown VIN C/S– B Out C/S+ VC E/A+ GND E/A– A Out COMP CT Sync RT Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits. DESCRIPTION/ORDERING INFORMATION The UC1846-EP control IC provides all of the necessary features to implement fixed-frequency, current-mode control schemes, while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load-response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current-limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel power modules, while maintaining equal current sharing. Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition to soft-start capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic restart or latch the supply off. Other features include fully latched operation, double pulse suppression, deadline adjust capability, and a ±1% trimmed bandgap reference. The UC1846-EP features low outputs in the OFF state. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2006, Texas Instruments Incorporated UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 ORDERING INFORMATION TA PACKAGE –55°C to 125°C ORDERABLE PART NUMBER SOIC – DW UC1846MDWREP TOP-SIDE MARKING UC1846MEP BLOCK DIAGRAM 5.1-V Reference Regulator VIN 15 2 VREF 13 VC Sync 10 RT UVLO Lockout Q Q 8 C/S− 3 Output Stage COMP X3 C/S+ 11 A Out T OSC CT F/F 9 S R Q 4 S 0.5 V 14 B Out + 0.5 mA NI 5 INV 6 COMP 7 12 GND E/A 1 CurrentLimit Adjust 16 Shutdown 350 mV 6k UDG−02057 2 Submit Documentation Feedback UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 Absolute Maximum Ratings (1) (2) MIN MAX UNIT Supply voltage (pin 15) 40 Collector supply voltage (pin 13) 40 V 500 mA Output current, source or sink (pins 11, 14) Analog inputs (pins 3, 4, 5, 6, 16) –0.3 V VIN V –30 mA Sync output current (pin 10) –5 mA Error amplifier output current (pin 7) –5 mA Soft-start sink current (pin 1) 50 mA 5 mA Reference output current (pin 2) Oscillator charging current (pin 9) Power dissipation Storage temperature range (2) 1000 TC = 25°C 2000 –65 Lead temperature (soldering, 10 s) (1) TA = 25°C mW 150 °C 300 °C Stresses beyond 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-rated conditions for extended periods may affect device reliability. All voltages are with respect to ground, pin 13. Currents are positive into, negative out of the specified terminal. Submit Documentation Feedback 3 UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 Electrical Characteristics TA = –55°C to 125°C, VIN = 15 V, RT = 10 k, CT = 4.7 nF, TA = TJ (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 5.05 5.1 5.15 V Reference Output voltage TJ = 25°C, IO = 1 mA Line regulation VIN = 8 V to 40 V 5 20 Load regulation IL = 1 mA to 10 mA 3 15 Temperature stability Over operating range (1) Total output variation Line, load, and temperature (1) Output noise voltage 10 Hz ≤ f ≤ 10 kHz, TJ = 25°C (1) Long-term stability TJ = 125°C, 1000 h Short-circuit output current VREF = 0 V Initial accuracy TJ = 25°C Voltage stability VIN = 8 V to 40 V 0.4 mV mV mV/°C 5 5.2 V 100 µV 5 mV –10 –45 mA 39 43 47 kHz –1 2 % Oscillator Temperature stability Over operating range (1) Sync output high level –1 3.9 Sync output low level % 4.35 V 2.3 Sync input high level Pin 8 = 0 V Sync input low level Pin 8 = 0 V Sync input current Sync voltage = 3.9 V, Pin 8 = 0 V 2.5 3.9 V V 1.3 2.5 V 1.5 mA Error Amplifier Input offset voltage Input bias current Input offset current 5 mV –1 µA 40 250 nA Common-mode range VIN = 8 V to 40 V Open-loop voltage gain ∆VO = 1.2 V to 3 V, VCM = 2 V 80 105 Unity gain bandwidth TJ = 25°C (1) 0.7 1 CMRR VCM = 0 V to 38 V, VIN = 40 V 75 100 PSRR VIN = 8 V to 40 V 80 105 dB Output sink current VID = –15 mV to –5 V, VPIN7 = 1.2 V 2 6 mA Output source current VID = 15 mV to 5 V, VPIN7 = 2.5 V –0.4 –0.5 mA High-level output voltage RL = 15 kΩ (pin 7) 4.3 4.6 Low-level output voltage RL = 15 kΩ (pin 7) (1) 4 0.5 –0.6 0 VIN – 2 0.7 These parameters, although specified over the recommended operating conditions, are not 100% tested in production. Submit Documentation Feedback V dB MHz dB V 1 V UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 Electrical Characteristics (continued) TA = –55°C to 125°C, VIN = 15 V, RT = 10 k, CT = 4.7 nF, TA = TJ (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 3 UNIT Current-Sense Amplifier Amplifier gain VPIN3 = 0 V, Pin 1 open (2) (3) 2.5 2.75 Maximum differential input signal (VPIN4 – VPIN3) Pin 1 open, (2) RL (pin 7) = 15 kW 1.1 1.2 Input offset voltage VPIN1 = 0.5 V, Pin 7 open (2) CMRR VCM = 1 V to 12 V 60 83 PSRR VIN = 8 V to 40 V 60 Input bias current VPIN1 = 0.5 V, Pin 7 open (2) Input offset current VPIN1 = 0.5 V, Pin 7 open (2) Input common-mode range Delay to outputs 25 mV dB 84 dB –2.5 –10 µA 1 µA VIN – 3 V 200 500 ns 0.5 0.55 V –10 –30 µA 350 400 mV 0.08 0 TJ = V 5 25°C (4) V Current-Limit Adjust Current-limit offset VPIN3 = 0 V, VPIN4 = 0 V, Pin 7 open (2) Input bias current VPIN5 = VREF, VPIN6 = 0 V 0.45 Shutdown Terminal Threshold voltage 250 Input voltage range 0 Minimum latching current (IPIN1) (5) 3 Maximum nonlatching current (IPIN1) (6) Delay to outputs TJ = 25°C (4) VIN 1.5 V mA 1.5 0.8 mA 300 600 ns 200 µA Output Collector-emitter voltage Collector leakage current Output low level Output high level 40 V VC = 40 V ISINK = 20 mA 0.1 0.4 ISINK = 100 mA 0.4 2.1 ISOURCE = 20 mA 13 13.5 ISOURCE = 100 mA 12 13.5 V V Rise time CL = 1 nF, TJ = 25°C (4) 50 300 ns Fall time CL = 1 nF, TJ = 25°C (4) 50 300 ns 7.7 8 V Undervoltage Lockout Start-up threshold Threshold hysteresis 0.75 V Total Standby Current Supply current (2) (3) (4) (5) (6) 17 21 mA Parameter measured at trip point of latch with VPIN5 = VREF, VPIN6 = 0 V. Amplifier gain defined as: ǒDV PIN7Ǔ G+ ǒDV PIN4Ǔ where VPIN4 = 0 to 1 V These parameters, although specified over the recommended operating conditions, are not 100% tested in production. Current into pin 1 is ensured to latch circuit in shutdown state. Current into pin 1 is ensured not to latch circuit in shutdown state. Submit Documentation Feedback 5 UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 15 14 13 12 Years Estimated Life 11 10 9 8 7 6 5 4 3 2 1 0 110 115 120 125 130 Continuous TA – °C Figure 1. UC1846MDWREP Estimated Device Life at Elevated Temperatures Wirebond Voiding Fail Modes 6 Submit Documentation Feedback 135 UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 APPLICATION INFORMATION 7.5 mA Output deadtime is determined by the external capacitor, CT, according to the formula: ID ID * R 3.6 (kW) T τd (µs) = 145CT (µf) ID = Oscillator discharge current at 25°C is typically 7.5 mA. For large values of RT: τd (µs) ≈ 145CT (µf) 2.2 Oscillator frequency is approximated by the formula: f (kHz) ≈ RT (kW) CT (mf) T Figure 2. Oscillator Circuit VREF VREF 5 0.5 mA 6 ZS 7 Comp ZF IF < 0.5 mA Error amplifier can source up to 0.5 mA. VIN = 20 V TA = 255C Open-Loop Phase Open-Loop Voltage Gain (dB) Figure 3. Error-Amplifier Output Configuration Frequency (Hz) Figure 4. Error-Amplifier Gain and Phase vs Frequency Submit Documentation Feedback 7 UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 Open-Loop Voltage Gain (dB) APPLICATION INFORMATION (continued) VIN = 20 V TA = 255C RL – Output Load Resistance (kW) Figure 5. Error-Amplifier Open-Logic DC Gain vs Load Resistance Figure 6. Parallel Operation 8 Submit Documentation Feedback UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 APPLICATION INFORMATION (continued) 0.5 mA 0.5 V R2 VREF − 0.5 R1 + R2 Peak current (IS) is determined by the formula: IS = 3RS Figure 7. Pulse-by-Pulse Current Limiting Submit Documentation Feedback 9 UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 APPLICATION INFORMATION (continued) 3 mA (latched off) 3 mA, the device Figure 8. Soft-Start and Shutdown/Restart Functions A small RC filter may be required in some applications to reduce switch transients. Differential input allows remote noise-free sensing. Figure 9. Current-Sense Amplifier Connection 10 Submit Documentation Feedback UC1846-EP CURRENT-MODE PWM CONTROLLER www.ti.com SGLS329 – MAY 2006 APPLICATION INFORMATION (continued) Frequency Set and Max Duty Cycle RT VREF (5-V Output) VIN (12 V) Timing Cap CT 5V 5V 0.1 mF 1 nF 4.7 nF UC1846-EP ISENSE Adjust (91 V PK) (12 V) 0.1 mF 5V Duty-Cycle Adjust 150 W 5V 150 W Current-Limit Adjust –Bypass capacitance should be low ESR and ESL type. –Short pins 6 and 7 for unity gain testing. Figure 10. Open-Loop Test Circuit Submit Documentation Feedback 11 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) (3) Device Marking (4/5) (6) UC1846MDWREP ACTIVE SOIC DW 16 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -55 to 125 UC1846MEP V62/06606-01XE ACTIVE SOIC DW 16 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -55 to 125 UC1846MEP (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of