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UC2845BDR2G 데이터시트(PDF) 3 Page - ON Semiconductor |
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3 / 20 page UC3844B, UC3845B, UC2844B, UC2845B http://onsemi.com 3 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, SOIC−14 Case 751A Maximum Power Dissipation @ TA = 25°C Thermal Resistance, Junction−to−Air D1 Suffix, Plastic Package, SOIC−8 Case 751 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 PD RqJA 862 145 702 178 1.25 100 mW °C/W mW °C/W W °C/W Operating Junction Temperature TJ +150 °C Operating Ambient Temperature UC3844B, UC3845B UC2844B, UC2845B TA 0 to + 70 − 25 to + 85 °C Storage Temperature Range Tstg − 65 to +150 °C Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. 1. Maximum package power dissipation limits must be observed. ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 2], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 3], unless otherwise noted.) UC284XB UC384XB, XBV Characteristic 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, and Temperature Vref 4.9 − 5.1 4.82 − 5.18 V Output Noise Voltage (f = 10 Hz to 10 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 TJ = 25°C (RT = 6.2 k, CT = 1.0 nF) fOSC 49 48 225 52 − 250 55 56 275 49 48 225 52 − 250 55 56 275 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 − 1.0 − − 0.5 − % Oscillator Voltage Swing (Peak−to−Peak) VOSC − 1.6 − − 1.6 − V Discharge Current (VOSC = 2.0 V) TJ = 25°C TA = Tlow to Thigh (UC284XB, UC384XB) TA = Tlow to Thigh (UC384XBV) Idischg 7.8 7.5 − 8.3 − − 8.8 8.8 − 7.8 7.6 7.2 8.3 − − 8.8 8.8 8.8 mA 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 UC3844B, UC3845B Thigh =+ 70°C for UC3844B, UC3845B =− 25 °C for UC2844B, UC2845B = + 85 °C for UC2844B, UC2845B =− 40 °C for UC3844BV, UC3845BV = +105 °C for UC3844BV, UC3845BV |
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