TLS1242 TI1 | Alldatasheet
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TLS1242, TLS1244 CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR SLVS161 – MAY 1997 1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 /C0068Single-Chip Solution for High-Power-Factor Switching Power Supply /C0068Current-Mode PWM Controller /C0068Fixed-Frequency Average-Current Power-Factor Corrector (PFC) Synchronized with PWM Controller /C0068Full Range ac Operation /C0068Low Start-Up Current /C0068Pulse-by-Pulse Current Limiting for PFC /C0068Undervoltage Lockout with Hysteresis /C0068Internally Trimmed Bandgap Reference /C0068External Synchronous Pin /C0068Overvoltage Protection for PFC /C0068Upper 8 Pins Configuration Same as UC3842
description
The TLS1242 and TLS1244 are designed as optimal high-power-factor switching power supply systems with minimum external components. The current-mode PWM controller and the fixed-frequency average-current power-factor corrector (PFC) of each device are combined into a 20-pin DIP package. Internally implemented circuits include: undervoltage lockout (UVLO), featuring a low start-up current; a precision reference that can be trimmed for accuracy at the error amplifier input; a multiplier; two PWM comparators; overvoltage protection (OVP); and two totem-pole output stages designed to source or sink current. The output stage is suitable for driving n-channel MOSFETs, and is low when in the off state. The fixed-frequency average-current-mode power-factor-correction controller circuit is synchronized with a current-mode PWM controller internally. Fixed-frequency power-factor correction helps prevent problems in frequency-sensitive applications such as video monitor, telecom, RF transmitters, and medical imaging. The synchronization of the PFC with the PWM controller helps reduce EMI problems as well. The pin assignment of both the TLS1242 and the TLS1244 is intended to accommodate the UC3842/3844 as well, if PFC is not required in the application. The upper pins (1, 2, 3, 4, 17, 18, 19 and 20) have the same pin assignment as the UC3842, making the current-mode SPS application more flexible. The PWM portion of the TLS1242 can operate to duty cycle approaching 100%. A duty cycle range of 0 to 50% is obtained using the TLS1244. The TLS1242 and TLS1244 are characterized for operation from 0°C to 70°C. Copyright 1997, Texas Instruments IncorporatedPRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. COMP FB ISENS1 CT RT GND ISENS2 CAO MULT SYNC REF VCC OUT1 PGND OUT2 PKLIM IAC RMS AO VSENSE N OR DW PACKAGE (TOP VIEW) PRODUCT PREVIEW
TLS1242, TLS1244 CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR SLVS161 – MAY 1997
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POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 functional block diagram Reference Regulator VCC UVLO 34 V R R Vref Good T Oscillator S PWM Latch R Q Q S PFC Latch R Q Q Current Sense Comparator 1 V_ VCCPKLIM Comparator Error Amplifier VI(SENSE) OVP Comparator PFC PWM Comparator PGND Multiplier I V X2 + Voltage Amplifier PWM CONTROLLER PFC CONTROLLER VCC REF SYNC RT CT FB COMP PKLIM CAO ISENS2 MULT IAC AO VSENSE RMS 2.5 V OUT1 PGND ISENS1 OUT2 GNDCurrent Amplifier PRODUCT PREVIEW
TLS1242, TLS1244 CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR SLVS161 – MAY 1997 3POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 Terminal Functions TERMINAL NAME NO. AO 12 Voltage amplifier output for frequency compensation CAO 8 Current amplifier output for PFC COMP 1 Error amplifier output for frequency compensation CT 4 Oscillator timing control FB 2 Error amplifier inverting input for PWM GND 6 Control section ground IAC 14 Current multiplier input ISENS1 3 Input from current-sense device of PWM, connected to current-sense comparator ISENS2 7 Input from current sense device of PFC, connected to current amplifier MULT 9 Multiplier output OUT1 18 Totem-pole output for PWM OUT2 16 Totem-pole output for PFC PGND 17 Output section ground PKLIM 15 Peak current limit for PFC REF 20 Output for the 5 V reference RMS 13 Input for PFC rms line compensation RT 5 Oscillator charge current control SYNC 10 External synchronous signal input pin VCC 19 Positive supply VSENSE 11 Voltage amplifier inverting input for PFC absolute maximum ratings over operating free-air temperature (unless otherwise noted) NOTE 1: All voltages are with respect to GND. Maximum package power dissipation limits must be observed. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE T A = 25°C TA = 70°C POWER RATING TA = 85°C POWER RATING N 1874 mW 15 mW/°C 1200 mW 975 mW DW 1430 mW 11.4 mW/°C 915 mW 744 mW PRODUCT PREVIEW
TLS1242, TLS1244 CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR SLVS161 – MAY 1997
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POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 recommended operating conditions MIN NOM MAX UNIT Supply voltage, VCC 20 V Input voltage at CT input 0 5.5 V Input voltage at FB, ISENS, VSENSE, RMS, SYNC and PKLIM –0.3 5.5 V Voltage on output 0 20 V Supply current, externally limited, ICC 2.5 mA Average output current, IO 200 mA Reference output current –20 mA Timing capacitor, CT 1 2.2 nF Oscillator frequency 100 200 kHz Operating free-air temperature, TA 0 70 °C Input current at IAC 750 mA electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (see Note 3), RT = 47 kW , CT = 2.2 nF, PKLIM = 1 V, RMS = 1.5 V, IAC = 100 mA, ISENS = 0 V, CAO = 4 V, AO = 3.5 V, VSENSE = 3 V, TA = full range (unless otherwise specified) reference PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Output voltage IO = 1 mA, TA = 25°C 4.95 5 5.05 V Line regulation VCC = 12 V to 20 V 6 20 mV Load regulation IO = 1 mA to 20 mA 6 25 mV Temperature coefficient of output voltage 0.2 0.4 mV/°C Output voltage, worst-case variation VCC = 12 V to 20 V, IO = 1 mA to 20 mA 4.9 5.1 V Output noise voltage f = 10 Hz to 10 kHz,TA = 25°C 50 100 mV Output voltage, long-term drift After 1000 at TA = 125°C 5 25 mV Short-circuit output current –30 –100 –180 mA oscillator PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Oscillator frequency TA = 125°C 43 48 53 kHz Frequency change with supply voltage VCC = 12 V to 20 V 1% 2% Frequency change with temperature TA = 0°C to 70°C 1% Peak-to-peak amplitude voltage at CT 4.6 V Valley-point voltage TA = 25°C 1.15 1.65 V current sense comparator PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Voltage amplification See Note 2, See Note 3 2.85 3 3.15 V/V Current-sense comparator threshold voltage COMP at 5 V, See Note 2 0.9 1 1.1 V Supply voltage rejection ratio VCC = 12 V to 20 V,See Note 2 70 dB Input bias current –2 –10 mA Delay time to output 150 300 ns PRODUCT PREVIEW
TLS1242, TLS1244 CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR SLVS161 – MAY 1997 5POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (see Note 2), RT = 47 kW , CT = 2.2 nF, PKLIM = 1 V, RMS = 1.5 V, IAC = 100 mA, ISENS = 0 V, CAO = 4 V, AO = 3.5 V, VSENSE = 3 V, TA = full range (unless otherwise specified) comparator PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OVP threshold voltage 2.6 2.7 2.8 V OVP hysteresis voltage 80 115 150 mV Threshold voltage, PKLIM –0.2 0 0.2 V Delay to OUT2, PKLIM VSENSE < 2.5 V, See Note 4 150 300 ns voltage amplifier PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Input voltage AO at 2.5 V 2.42 2.58 V Bias current, VSENSE VSENSE = 2.5 V –500 –25 500 nA Open-loop voltage amplification VO = 2 V to 6 V 70 100 dB Gain-bandwidth product fI = 100 kHz, See Note 4 10 mV VO(PP), 0.7 1 MHz Supply-voltage rejection ratio VCC = 12 V to 20 V 60 70 dB Output short-circuit current VO = 0 V –1.5 –3.5 mA High-level output voltage IL = –500 mA 5 6 V Low-level output voltage IL = 500 mA 0.7 1.1 V current amplifier PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Input offset voltage VI(CM) = 0 V –2 2 mV Input bias current VI(CM) = 0 V –500 500 nA Open-loop voltage amplification VI(CM) = 0 V,VO = 2 V to 6 V 80 110 dB Gain-bandwidth product fI = 100 kHz, See Note 4 10 mV VO(PP), 1 3 MHz Supply-voltage rejection ratio VCC = 12 V to 20 V 60 70 dB Output short-circuit current VO = 0 V –1.5 –3.5 mA High-level output voltage IL = –500 mA 5 6 V Low-level output voltage IL = 500 mA 0.7 1.1 V multiplier PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Output current , IAC limited IAC = 100 mA, RMS = 1 V –220 –200 –170 mA Output current, zero IAC = 0 mA –2 –0.2 2 mA Output current, power limited RMS = 1.5 V, AO = 6 V –220 –200 –170 mA RMS = 1.5 V, AO = 5 V –156 Output current RMS = 1.5 V, AO = 2 V –22 mAO utput current RMS = 5 V, AO = 5 V –14 mA RMS = 5 V, AO = 2 V –2 Gain constant RMS = 1.5 V, See Note 5 PRODUCT PREVIEW
TLS1242, TLS1244 CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR SLVS161 – MAY 1997
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POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (see Note 3), RT = 47 kW , CT = 2.2 nF, PKLIM = 1 V, RMS = 1.5 V, IAC = 100 mA, ISENS = 0 V, CAO = 4 V, AO = 3.5 V, VSENSE = 3 V, TA = full range (unless otherwise specified) error amplifier PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Feedback input voltage COMP = 2.5 V 2.42 2.58 V Input bias current FB = 2.5 V –0.3 –2 mA Open-loop voltage amplification VO = 2 V to 4 V 65 90 dB Gain-bandwidth product fI = 100 kHz, See Note 4 10 mV VO(PP), 0.7 1 MHz Supply-voltage rejection ratio VCC = 12 V to 20 V 60 70 dB Output sink current FB at 2.7 V,COMP AT 1.1 V 2 6 mA Output source current FB at 2.3 V,COMP AT 5 V –0.5 –0.8 mA High-level output voltage FB at 2.3 V,R L = 15 kW to GND 5 6 V Low-level output voltage FB at 2.7 V,R L = 15 kW to REF 0.7 1.1 V undervoltage lockout PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Start-up threshold voltage 14.5 16 17.5 V Minimum operating voltage after start-up 8.5 10 11.5 V output PARAMETER TEST CONDITIONS MIN TYP MAX UNIT High level output voltage IOH = –20 mA 13 13.5 VHigh-level output voltage IOH = –200 mA 12 13.5 V Low level output voltage IOL = 20 mA 0.2 0.4 VLow-level output voltage IOL = 200 mA 1 2.2 V Rise time C L = 1 nF,TA = 25°C 50 150 ns Fall time C L = 1 nF,TA = 25°C 50 150 ns pulse-width-modulator PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Maximum duty cycle 93% 95% Minimum duty cycle 0 supply voltage PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Start-up current 0.7 1.1 mA Operating supply current FB and ISENS and IAC at 0 V 30 mA Limiting voltage ICC = 25 mA 34 V NOTES: 2. Adjust VCC above the start threshold before setting it to 15 V. 3. These parameters are measured at the trip point of the latch with FB at 0 V. 4. Voltage amplification is measured between the input at ISENS1 and the output at COMP with the input changing from 0 V to 0.8 V. 5. Specified by design, not 100% tested in production 6. Gain constant (k) = (II(IAC) × [VI(AO) – 1.5])/(VI(RMS)2 × II(MULT)) PRODUCT PREVIEW
Figure 1. Test Circuit
8 POST OFFICE BOX 655303 DALLAS, TEXAS 75265•POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443•
5 A to 20 A
5 V 12 V
Figure 2. Application Circuit, Forward
200 V to
90 V to
24 V to
15 V to
6.3 V to
0 V to
Figure 3. Application Circuit, Flyback
TLS1242, TLS1244 CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR SLVS161 – MAY 1997
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POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 MECHANICAL DATA N (R-PDIP-T) PLASTIC DUAL-IN-LINE PACKAGE 0.975 (24,77) 0.940 (23,88) 0.920 0.850 0.775 0.745 (19,69) (18,92) 0.775 (19,69) (18,92) 0.745A MIN DIM A MAX PINS 0.310 (7,87) 0.290 (7,37) (23.37) (21.59) Seating Plane 0.010 (0,25) NOM 14/18 PIN ONLY 4040049/C 08/95 0.070 (1,78) MAX A 0.035 (0,89) MAX 0.020 (0,51) MIN 0.015 (0,38) 0.021 (0,53) 0.200 (5,08) MAX 0.125 (3,18) MIN 0.240 (6,10) 0.260 (6,60) M0.010 (0,25)
16 PIN SHOWN
NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Falls within JEDEC MS-001 (20 pin package is shorter then MS-001.) PRODUCT PREVIEW
TLS1242, TLS1244 CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR SLVS161 – MAY 1997 11POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 MECHANICAL DATA DW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 0.400 (10,15) 0.419 (10,65) 0.104 (2,65) MAX 0.012 (0,30) 0.004 (0,10) A 0.020 (0,51) 0.014 (0,35) 0.293 (7,45) 0.299 (7,59) 0.010 (0,25) 0.050 (1,27) 0.016 (0,40) (15,24) (15,49) PINS ** 0.010 (0,25) NOM A MAX DIM A MIN Gage Plane 0.500 (12,70) (12,95) 0.510 (10,16) (10,41) 0.400 0.410 0.600 0.610 (17,78) 0.700 (18,03) 0.710 0.004 (0,10) M0.010 (0,25) 0.050 (1,27) 0°–8° NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Body dimensions do not include mold flash or protrusion not to exceed 0.006 (0,15). D. Falls within JEDEC MS-013 PRODUCT PREVIEW
Orderable Device Status(1) Package Type Package Drawing Pins Package Qty Eco Plan(2) Lead/Ball FinishMSL Peak Temp (3) TLS1242N OBSOLETE PDIP N 20 TBD Call TI Call TI (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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontentfor the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS):TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br):TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. PACKAGE OPTION ADDENDUM www.ti.com 30-Mar-2005 Addendum-Page 1
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