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UC2845D 数据表(PDF) 2 Page - ON Semiconductor |
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UC2845D 数据表(HTML) 2 Page - ON Semiconductor |
2 / 14 page UC3844, 45 UC2844, 45 2 MOTOROLA ANALOG IC DEVICE DATA 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 µJ 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 R θJA PD R θJA 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 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 – µV 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) ∆fosc/∆V – 0.2 1.0 – 0.2 1.0 % Frequency Change with Temperature TA = Tlow to Thigh ∆fosc/∆T – 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 NOTES: 1. Maximum Package power dissipation limits must be observed. 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 = –20°C for UC3844, UC3845 Thigh = +70°C for UC3844, UC3845 Tlow = –25°C for UC2844, UC2845 Thigh = +85°C for UC2844, UC2845 |
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