CS2842A ONSEMI | Alldatasheet

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Technical content

Features

  • Optimized for Off−line Control
  • Internally Trimmed Temperature Compensated Oscillator
  • Maximum Duty−Cycle Clamp
  • VREF Stabilized Before Output Stage is Enabled
  • Low Startup Current
  • Pulse−By−Pulse Current Limiting
  • Improved Undervoltage Lockout
  • Double Pulse Suppression
  • 1.0% Trimmed Bandgap Reference
  • High Current Totem Pole Output http://onsemi.com x = 2 or 3 y = 2 or 3 A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week DIP−8 N SUFFIX CASE 626 SO−8 D SUFFIX CASE 7511 SO−14 D SUFFIX CASE 751A1 x84yA AWL YYWW MARKING DIAGRAM x84yA ALYWX CSx84yA AWLYWW See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.

ORDERING INFORMATION

Figure 1. Block Diagram

16 V/10 V

CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com MAXIMUM RATINGS* Rating Value Unit Supply Voltage (ICC < 30 mA) Self Limiting − Supply Voltage (Low Impedance Source) 30 V Output Current ±1.0 A Output Energy (Capacitive Load) 5.0 μJ Analog Inputs (VFB, Sense) −0.3 to + 5.5 V Error Amp Output Sink Current 10 mA Package Thermal Resistance, PDIP−8 Junction−to−Case, RθJC Junction−to−Ambient, RθJA 100 °CW °CW Package Thermal Resistance, SO−8 Junction−to−Case, RθJC Junction−to−Ambient, RθJA 165 °CW °CW Package Thermal Resistance, SO−14 Junction−to−Case, RθJC Junction−to−Ambient, RθJA 125 °CW °CW Lead Temperature Soldering: Wave Solder (through hole styles only) (Note 1) Reflow (SMD styles only) (Note 2) 260 peak 230 peak 1. 10 second maximum. 2. 60 second maximum above 183 °C. *The maximum package power dissipation must be observed. ELECTRICAL CHARACTERISTICS (−25° ≤ TA ≤ 85°for CS2842A/CS2843A, 0° ≤ TA ≤ 70°for CS3842A/CS3843A. VCC = 15 V*; RT = 680 Ω, CT = 0.022 μF for triangular mode, RT = 10 kΩ, CT = 3.3 nF for sawtooth mode (see Figure 7); unless otherwise stated.) Characteristic Test Conditions CS2842A/CS2843A CS3842A/CS3843A UnitMin Typ Max Min Typ Max Reference Section Line Regulation 12 ≤ VIN ≤ 25 V − 6.0 20 − 6.0 20 mV Load Regulation 1.0 ≤ IOUT ≤ 20 mA − 6.0 25 − 6.0 25 mV Output Noise Voltage 10 Hz ≤ f ≤ 10 kHz, TJ = 25°C (Note 3.) − 50 − − 50 − μV Output Short Circuit TA = 25°C −30 −100 −180 −30 −100 −180 mA Oscillator Section Initial Accuracy Sawtooth Mode (see Figure 7), TJ = 25°C Triangular Mode (see Figure 7), TJ = 25°C kHz kHz Voltage Stability 12 ≤ VCC ≤ 25 V − 0.2 1.0 − 0.2 1.0 % Temperature Stability Sawtooth Mode TMIN ≤ TA ≤ TMAX (Note 3.) Triangular Mode TMIN ≤ TA ≤ TMAX (Note 3.) 5.0 8.0 5.0 8.0 Amplitude OSC peak to peak − 1.7 − − 1.7 − V Discharge Current TJ = 25°C TMIN ≤ TA ≤ TMAX 7.5 7.2 8.3 9.3 9.5 7.5 7.2 8.3 9.3 9.5 mA mA 3. These parameters, although guaranteed, are not 100% tested in production. *Adjust VCC above the start threshold before setting at 15 V.

CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com ELECTRICAL CHARACTERISTICS (continued) (−25° ≤ TA ≤ 85°for CS2842A/CS2843A, 0° ≤ TA ≤ 70°for CS3842A/CS3843A. VCC = 15 V*; RT = 680 Ω, CT = 0.022 μF for triangular mode, RT = 10 kΩ, CT = 3.3 nF for sawtooth mode (see Figure 7); unless otherwise stated.) Characteristic Test Conditions CS2842A/CS2843A CS3842A/CS3843A UnitMin Typ Max Min Typ Max Error Amp Section Input Bias Current VFB = 0 − −0.3 −1.0 − −0.3 −2.0 μA AVOL 2.0 ≤ VOUT ≤ 4.0 V 65 90 − 65 90 − dB PSRR 12 ≤ VCC ≤ 25 V 60 70 − 60 70 − dB Current Sense Section PSRR 12 ≤ VCC ≤ 25 V (Note 5.) − 70 − − 70 − dB Input Bias Current VSENSE = 0 − −2.0 −10 − −2.0 −10 μA Delay to Output TJ = 25°C (Note 4.) − 150 300 − 150 300 ns Output Section Output Low Level ISINK = 20 mA ISINK = 200 mA 0.1 1.5 0.4 2.2 0.1 1.5 0.4 2.2 V V Output High Level ISOURCE = 20 mA ISOURCE = 200 mA 13.5 13.5 13.5 13.5 V V Rise Time TJ = 25°C, CL = 1.0 nF (Note 4.) − 50 150 − 50 150 ns Fall Time TJ = 25°C, CL = 1.0 nF (Note 4.) − 50 150 − 50 150 ns Output Leakage UVLO Active, VOUT = 0 − −0.01 −10.00 − −0.01 −10.00 μA Total Standby Current Startup Current − − 0.5 1.0 − 0.5 1.0 mA Operating Supply Current VFB = VSENSE = 0 V, RT = 10 kΩ, CT = 3.3 nF 11 17 − 11 17 − mA VCC Zener Voltage ICC = 25 mA − 34 − − 34 − V 4. These parameters, although guaranteed, are not 100% tested in production. 5. Parameters measured at trip point of latch with V FB = 0. 6. Gain defined as: A = ΔVCOMP/ΔVSENSE; 0 ≤ VSENSE ≤ 0.8 V. *Adjust VCC above the start threshold before setting at 15 V.

ELECTRICAL CHARACTERISTICS (continued) (−25° ≤ TA ≤ 85°for CS2842A/CS2843A, 0° ≤ TA ≤ 70°for CS3842A/CS3843A. *Adjust VCC above the start threshold before setting at 15 V. Error amp output, used to compensate error amplifier. Noninverting input to Current Sense Comparator. Oscillator timing network with capacitor to ground, resistor to VREF. Output driver positive supply. Output of 5.0 V internal reference. Figure 2. Oscillator Frequency vs. CT Figure 3. Oscillator Duty Cycle vs. RT

CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com tc /C0043RTCT ln/C0466VREF /C0042Vlower VREF /C0042Vupper /C0467 td /C0043RTCT ln/C0466VREF /C0042IdRT /C0042Vlower VREF /C0042IdRT /C0042Vupper /C0467 Substituting in typical values for the parameters in the above formulas: VREF = 5.0 V Vupper = 2.7 V Vlower = 1.0 V Id = 8.3 mA tc ≈ 0.5534RTCT td /C0043RTCT ln/C04662.3 /C00420.0083RT 4.0 /C00420.0083RT /C0467 The frequency and maximum duty cycle can be determined using the Typical Performance Characteristic graphs. Grounding High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to GND pin in a single point ground. The transistor and 5.0 kΩ potentiometer, shown in the test circuit, are used to sample the oscillator waveform and apply and adjustable ramp to Sense. Figure 7. Oscillator Timing Network and Parameters Internal Clock Triangular Mode VOSC VOSC Internal Clock Small RT (≈ 700 kΩ) Large RT (≈ 10 kΩ) Sawtooth Mode Timing Parameters Vupper Vlower tc td VREF OSC GND RT CT

CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com Device Temperature Range Package Shipping CS2842ALN8 −25°C to 85°C DIP−8 50 Units/Rail CS2843ALN8 DIP−8 50 Units/Rail CS2842ALD14 SO−14 55 Units/Rail CS2842ALDR14 SO−14 2500 Tape & Reel CS3842AGN8 0°C to 70°C DIP−8 50 Units/Rail CS3842AGD8 SO−8 98 Units/Rail CS3842AGDR8 SO−8 2500 Tape & Reel CS3842AGD14 SO−14 55 Units/Rail CS3842AGDR14 SO−14 2500 Tape & Reel CS3843AGN8 DIP−8 50 Units/Rail CS3843AGD8 SO−8 98 Units/Rail CS3843AGDR8 SO−8 2500 Tape & Reel CS3843AGD14 SO−14 55 Units/Rail CS3843AGDR14 SO−14 2500 Tape & Reel

CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com PACKAGE DIMENSIONS DIP−8 N SUFFIX CASE 626−05 ISSUE L NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. F NOTE 2 −A− −B− −T− SEATING PLANE H J G D K N C L M MAM0.13 (0.005) B MT DIM MIN MAX MIN MAX INCHESMILLIMETERS A 9.40 10.16 0.370 0.400 B 6.10 6.60 0.240 0.260 C 3.94 4.45 0.155 0.175 D 0.38 0.51 0.015 0.020 F 1.02 1.78 0.040 0.070 G 2.54 BSC 0.100 BSC H 0.76 1.27 0.030 0.050 J 0.20 0.30 0.008 0.012 K 2.92 3.43 0.115 0.135 L 7.62 BSC 0.300 BSC N 0.76 1.01 0.030 0.040 /C0095/C0095 SO−8 D SUFFIX CASE 751−07 ISSUE W SEATING PLANE N J X 45/C0095 K NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. A B S DH C 0.10 (0.004) DIM A MIN MAX MIN MAX INCHES 4.80 5.00 0.189 0.197 MILLIMETERS B 3.80 4.00 0.150 0.157 C 1.35 1.75 0.053 0.069 D 0.33 0.51 0.013 0.020 G 1.27 BSC 0.050 BSC H 0.10 0.25 0.004 0.010 J 0.19 0.25 0.007 0.010 K 0.40 1.27 0.016 0.050 M 0 8 0 8 N 0.25 0.50 0.010 0.020 S 5.80 6.20 0.228 0.244 −X− −Y− G MYM0.25 (0.010) −Z− YM0.25 (0.010) Z S X S M /C0095/C0095/C0095/C0095

CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com PACKAGE DIMENSIONS SO−14 D SUFFIX CASE 751A−03 ISSUE F NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. −A− −B− G P 7 PL 14 8 M0.25 (0.010) B M SBM0.25 (0.010) A ST −T− FR X 45 SEATING PLANE D 14 PL K C JM /C0095 DIM MIN MAX MIN MAX INCHESMILLIMETERS A 8.55 8.75 0.337 0.344 B 3.80 4.00 0.150 0.157 C 1.35 1.75 0.054 0.068 D 0.35 0.49 0.014 0.019 F 0.40 1.25 0.016 0.049 G 1.27 BSC 0.050 BSC J 0.19 0.25 0.008 0.009 K 0.10 0.25 0.004 0.009 M 0 7 0 7 P 5.80 6.20 0.228 0.244 R 0.25 0.50 0.010 0.019 /C0095/C0095/C0095/C0095 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5773−3850 CS2842A/D LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative