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UC3843B Dataheets PDF



Part Number UC3843B
Manufacturers UTC
Logo UTC
Description CONTROLLERS
Datasheet UC3843B DatasheetUC3843B Datasheet (PDF)

UNISONIC TECHNOLOGIES CO., LTD UC3842B/3843B LINEAR INTEGRATED CIRCUIT HIGH PERFORMANCE CURRENT MODE CONTROLLERS  DESCRIPTION The UTC UC3842B/3843B are specifically designed for off-line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components. The UC3842B has UVLO thresholds 16V (on) and 10V(off), ideally suited for off-line converters. The UC3843B is tailored for lower voltage applications having UVLO thresholds of 8.4V(on) and .

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UNISONIC TECHNOLOGIES CO., LTD UC3842B/3843B LINEAR INTEGRATED CIRCUIT HIGH PERFORMANCE CURRENT MODE CONTROLLERS  DESCRIPTION The UTC UC3842B/3843B are specifically designed for off-line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components. The UC3842B has UVLO thresholds 16V (on) and 10V(off), ideally suited for off-line converters. The UC3843B is tailored for lower voltage applications having UVLO thresholds of 8.4V(on) and 7.6V(off).  FEATURES * Trimmed oscillator for precise frequency control * Oscillator frequency guaranteed at 250kHz * Current mode operation to 500kHz * Automatic feed forward compensation * Latching PWM for cycle-by-cycle current limiting * Internally trimmed reference with undervoltage lockout * High current totem pole output * Undervoltage lockout with hysteresis * Low startup and operating current  ORDERING INFORMATION Ordering Number Lead Free Halogen Free UC3842BL-D08-T UC3842BP-D08-T UC3842BL-S08-R UC3842BP-S08-R UC3843BL-D08-T UC3843BP-D08-T UC3843BL-S08-R UC3843BP-S08-R Package DIP-8 SOP-8 DIP-8 SOP-8 Packing Tube Tape Reel Tube Tape Reel www.unisonic.com.tw Copyright © 2019 Unisonic Technologies Co., Ltd 1 of 11 QW-R103-012.G UC3842B/3843B  MARKING Package DIP-8 UC3842B SOP-8  PIN CONFIGURATION COMP 1 VFB 2 CS 3 RTCT 4 LINEAR INTEGRATED CIRCUIT UC3843B 876 5 UTC UC3843B 1 23 4 Date Code L: Lead Free P: Halogen Free Lot Code 8 VREF 7 VCC 6 OUTPUT 5 GND  PIN DESCRIPTIONS PIN NO. 1 PIN NAME COMP I/O O 2 VFB I 3 CS I 4 RTCT I 5 GND 6 OUTPUT O 7 VCC 8 VREF O DESCRIPTION Error amp output to provide loop compensation maintaing VFB at 2.5V Error amp inverting input, The non-inverting input of error amp is 2.5V band gap reference Current sense input to PWM control gate drive of output To set oscillator frequency and maximum output duty cycle Power ground To direct drive power MOSFET Power supply 5V regulated output provides charging current for CT through RT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 11 QW-R103-012.G UC3842B/3843B  BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 11 QW-R103-012.G UC3842B/3843B LINEAR INTEGRATED CIRCUIT  ABSOLUTE MAXIMUM RATINGS(TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Total Power Supply and Zener Current (ICC + IZ) 30 mA Output Current, Source or Sink (Note 2) Output Energy (capacitive load per cycle) IO W 1.0 A 5.0 μJ Current Sense and Voltage Feedback Inputs Error Amp. Output Sink Current VIN IO(SINK) -0.3 ~ +5.5 10 V mA Power Dissipation DIP-8 SOP-8 PD 1250 800 mW mW Operating Junction Temperature Operating Temperature TJ TOPR +150 0 ~ +70 °C °C Storage Temperature TSTG -65 ~ +150 °C Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. Maximum Package power dissipation limits must be observed.  THERMAL DATA PARAMETER Junction to Ambient DIP-8 SOP-8 SYMBOL θJA RATINGS 100 156 UNIT C/W C/W  ELECTRICAL CHARACTERISTICS (0°C ≤TA≤70°C, VCC=15V (Note 1), RT=10k, CT=3.3nF, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS REFERENCE SECTION Output Voltage Line Regulation Load Regulation Temperature Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short Circuit Current VREF ∆VLINE ∆VLOAD TS VREF eN S ISC IO=1.0mA, TJ =25°C VCC=12V ~ 25V IO=1.0mA ~ 20mA Line, Load, Temperature F=10kHz ~ 10Hz, TJ =25°C TA=125°C,1000Hrs OSCILLATOR SECTION Frequency Frequency Change with Voltage Frequency Change with Temperature Oscillator Voltage Swing (Peak to Peak) F fOSC/V TJ =25°C TA=0°C ~ 70°C TJ =25°C (RT=6.2k,CT=1.0nF) 12 ≤ VCC ≤25V fOSC/T 0°C ≤TA ≤70°C VOSC Discharge Current IDISCHG TJ =25°C 0°C ≤TA ≤70°C MIN 4.9 4.82 -100 49 48 225 7.8 7.6 TYP 5.0 2.0 15 0.2 50 5 -155 52 250 0.2 0.5 1.6 8.3 8.3 MAX UNIT 5.1 20 35 5.18 -245 V mV mV mV/°C V μV mV mA 55 56 kHz 275 1.0 % % V 8.8 8.8 mA UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 11 QW-R103-012.G UC3842B/3843B LINEAR INTEGRATED CIRCUIT  ELECTRICAL CHARACTERISTICS (Cont.) PARAMETER SYMBOL TEST CONDITIONS ERROR AMPLIFIER SECTION Voltage Feedback Input Input Bias Current Open Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio Output Sink Current Output Source Current Output Voltage Swing High State Output Voltage Swing Low State CURRENT SENSE SECTION Current Sense Input Voltage Gain Maximum Current Sense Input Threshold VFB II(BIAS) GVO GBW PSRR ISINK ISOURCE VOH VOL GV VI(THR) Vo=2.5V VFB=5.0V 2 ≤VO≤4V TJ =25°C I2V≤VCC≤25V VO=1.1V,VFB =2.7V VO=5.0V,VFB=2.3V VFB=2.3V, RL=15k to GND VFB=2.7V, RL=15k to VREF (Note 2, 3) (Note 2) P.


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