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UC3842ADR2 Fiches technique(PDF) 3 Page - ON Semiconductor |
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UC3842ADR2 Fiches technique(HTML) 3 Page - ON Semiconductor |
3 / 18 page UC3842A, UC3843A, UC2842A, UC2843A http://onsemi.com 3 ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 2], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 3], unless otherwise noted.) Characteristics Symbol UC284XA UC384XA Unit Min Typ Max Min Typ Max 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 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 TA = Tlow to Thigh Idischg 7.5 7.2 8.4 − 9.3 9.5 7.5 7.2 8.4 − 9.3 9.5 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 Unity Gain Bandwidth (TJ = 25°C) BW 0.7 1.0 − 0.7 1.0 − MHz Power Supply Rejection Ratio (VCC = 12 V to 25 V) PSRR 60 70 − 60 70 − dB Output Current Sink (VO = 1.1 V, VFB = 2.7 V) Source (VO = 5.0 V, VFB = 2.3 V) ISink ISource 2.0 −0.5 12 −1.0 − − 2.0 −0.5 12 −1.0 − − mA Output Voltage Swing High State (RL = 15 k to ground, VFB = 2.3 V) Low State (RL = 15 k to Vref, VFB = 2.7 V) VOH VOL 5.0 − 6.2 0.8 − 1.1 5.0 − 6.2 0.8 − 1.1 V 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 UC3842A, UC3843A Thigh = +70°C for UC3842A, UC3843A −25 °C for UC2842A, UC2843A +85 °C for UC2842A, UC2843A |
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