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UC3844BDG Datasheet(PDF) 2 Page - ON Semiconductor |
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UC3844BDG Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 19 page ![]() UC3844B, UC3845B, UC2844B, UC2845B http://onsemi.com 2 MAXIMUM RATINGS Rating Symbol Value Unit Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) (Note 1) VCC, VC 36 V Total Power Supply and Zener Current (ICC + IZ) 30 mA Output Current, Source or Sink (Note 2) 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 UC3844BV, UC3845BV TA 0 to +70 −25 to +85 −40 to +105 °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. The voltage is clamped by a zener diode (see page 9 Under Voltage Lockout section). Therefore this voltage may be exceeded as long as the total power supply and zener current is not exceeded. 2. Maximum package power dissipation limits must be observed. 3. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per JEDEC Standard JESD22-A114B, Machine Model Method 200 V per JEDEC Standard JESD22-A115-A 4. This device contains latch-up protection and exceeds 100 mA per JEDEC Standard JESD78 ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 5], 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 6], unless otherwise noted.) UC284xB UC384xB, xBV, NCV384xBV 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, & 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 w/ Temperature (TA = Tlow to Thigh) DfOSC/DT − 1.0 − − 0.5 − % Oscillator Voltage Swing (Peak−to−Peak) VOSC − 1.6 − − 1.6 − V 5. Adjust VCC above the Startup threshold before setting to 15 V. 6. 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 UC384xBV, NCV384xBV =+105°C for UC3844BV, UC3845BV = +125°C for NCV384xBV |
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