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UC3842D1 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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UC3842D1 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 12 page UC3842/UC3843/UC3844/UC3845 3 Electrical Characteristics (VCC=15V, RT=10k Ω, CT=3.3nF, TA= 0°C to +70°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit REFERENCE SECTION Reference Output Voltage VREF TJ = 25 °C, IREF = 1mA 4.90 5.00 5.10 V Line Regulation ∆VREF 12V ≤ VCC ≤ 25V - 6 20 mV Load Regulation ∆VREF 1mA ≤ IREF ≤ 20mA - 6 25 mV Short Circuit Output Current ISC TA = 25 °C - -100 -180 mA OSCILLATOR SECTION Oscillation Frequency f TJ = 25 °C47 52 57 kHz Frequency Change with Voltage ∆f/∆VCC 12V ≤ VCC ≤ 25V - 0.05 1 % Oscillator Amplitude VOSC - -1.6 - VP-P ERROR AMPLIFIER SECTION Input Bias Current IBIAS - --0.1 -2 µA Input Voltage VI(E>A) Vpin1 = 2.5V 2.42 2.50 2.58 V Open Loop Voltage Gain GVO 2V ≤ VO ≤ 4V (Note3) 65 90 - dB Power Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V (Note3) 60 70 - dB Output Sink Current ISINK Vpin2 = 2.7V, Vpin1 = 1.1V 2 7 - mA Output Source Current ISOURCE Vpin2 = 2.3V, Vpin1 = 5V -0.6 -1.0 - mA High Output Voltage VOH Vpin2 = 2.3V, RL = 15k Ω to GND 5 6 - V Low Output Voltage VOL Vpin2 = 2.7V, RL = 15k Ω to Pin 8 - 0.8 1.1 V CURRENT SENSE SECTION Gain GV (Note 1 & 2) 2.85 3 3.15 V/V Maximum Input Signal VI(MAX) Vpin1 = 5V(Note 1) 0.9 1 1.1 V Power Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V (Note 1,3) - 70 - dB Input Bias Current IBIAS - --3 -10 µA OUTPUT SECTION Low Output Voltage VOL ISINK = 20mA - 0.08 0.4 V ISINK = 200mA - 1.4 2.2 V High Output Voltage VOH ISOURCE = 20mA 13 13.5 - V ISOURCE = 200mA 12 13.0 - V Rise Time tR TJ = 25 °C, CL= 1nF (Note 3) - 45 150 ns Fall Time tF TJ = 25 °C, CL= 1nF (Note 3) - 35 150 ns UNDER-VOLTAGE LOCKOUT SECTION Start Threshold VTH(ST) UC3842/UC3844 14.5 16.0 17.5 V UC3843/UC3845 7.8 8.4 9.0 V Min. Operating Voltage (After Turn On) VOPR(MIN) UC3842/UC3844 8.5 10.0 11.5 V UC3843/UC3844 7.0 7.6 8.2 V |
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