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UC2845DG Fiches technique(PDF) 2 Page - ON Semiconductor |
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UC2845DG Fiches technique(HTML) 2 Page - ON Semiconductor |
2 / 16 page UC3844, UC3845, UC2844, UC2845 http://onsemi.com 2 MAXIMUM RATINGS Rating Symbol Value Unit Total Power Supply and Zener Current (ICC + IZ) 30 mA Output Current, Source or Sink (Note 1) IO 1.0 A Output Energy (Capacitive Load per Cycle) W 5.0 mJ Current Sense and Voltage Feedback Inputs Vin − 0.3 to + 5.5 V Error Amp Output Sink Current IO 10 mA Power Dissipation and Thermal Characteristics D Suffix, Plastic Package, Case 751A Maximum Power Dissipation @ TA = 25°C Thermal Resistance Junction−to−Air N Suffix, Plastic Package, Case 626 Maximum Power Dissipation @ TA = 25°C Thermal Resistance Junction−to−Air PD RqJA PD RqJA 862 145 1.25 100 mW °C/W W °C/W Operating Junction Temperature TJ + 150 °C Operating Ambient Temperature UC3844, UC3845 UC2844, UC2845 TA 0 to + 70 − 25 to + 85 °C Storage Temperature Range Tstg − 65 to + 150 °C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. Maximum Package power dissipation limits must be observed. ELECTRICAL CHARACTERISTICS (VCC = 15 V, (Note 2), RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh (Note 3), unless otherwise noted.) UC284X UC384X Characteristics Symbol Min Typ Max Min Typ Max Unit REFERENCE SECTION Reference Output Voltage (IO = 1.0 mA, TJ = 25°C) Vref 4.95 5.0 5.05 4.9 5.0 5.1 V Line Regulation (VCC = 12 V to 25 V) Regline − 2.0 20 − 2.0 20 mV Load Regulation (IO = 1.0 mA to 20 mA) Regload − 3.0 25 − 3.0 25 mV Temperature Stability TS − 0.2 − − 0.2 − mV/°C Total Output Variation over Line, Load, Temperature Vref 4.9 − 5.1 4.82 − 5.18 V Output Noise Voltage (f = 10 Hz to kHz, TJ = 25°C) Vn − 50 − − 50 − mV Long Term Stability (TA = 125°C for 1000 Hours) S − 5.0 − − 5.0 − mV Output Short Circuit Current ISC − 30 − 85 − 180 − 30 − 85 − 180 mA OSCILLATOR SECTION Frequency TJ = 25°C TA = Tlow to Thigh fosc 47 46 52 − 57 60 47 46 52 − 57 60 kHz Frequency Change with Voltage (VCC = 12 V to 25 V) Dfosc/DV − 0.2 1.0 − 0.2 1.0 % Frequency Change with Temperature TA = Tlow to Thigh Dfosc/DT − 5.0 − − 5.0 − % Oscillator Voltage Swing (Peak−to−Peak) Vosc − 1.6 − − 1.6 − V Discharge Current (Vosc = 2.0 V, TJ = 25°C) Idischg − 10.8 − − 10.8 − mA ERROR AMPLIFIER SECTION Voltage Feedback Input (VO = 2.5 V) VFB 2.45 2.5 2.55 2.42 2.5 2.58 V Input Bias Current (VFB = 2.7 V) IIB − −0.1 −1.0 − −0.1 −2.0 mA Open Loop Voltage Gain (VO = 2.0 V to 4.0 V) AVOL 65 90 − 65 90 − dB 2. Adjust VCC above the Startup threshold before setting to 15 V. 3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Tlow =0°C for UC3844, UC3845 Thigh = +70°C for UC3844, UC3845 −25°C for UC2844, UC2845 +85°C for UC2844, UC2845 |
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