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UC3842ADX Datenblatt(PDF) 3 Page - Fairchild Semiconductor |
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UC3842ADX Datenblatt(HTML) 3 Page - Fairchild Semiconductor |
3 / 8 page UC3842A/UC3843A 3 Electrical Characteristics (Continued) (VCC = 15V, RT = 10KΩ, CT = 3.3nF, TA = 0°C to + 70°C, Unless otherwise specified) * Adjust VCC above the start threshold before setting at 15V Notes : 1. These parameters, although guaranteed, are not 100% tested in production. 2. Parameter measured at trip point of latch with V2 = 0V. 3. Gain defined as: GV = ∆VPIN1∆VPIN3(VPIN3 = 0 to 0.8V) Parameter Symbol Conditions Min. Typ. Max. Unit ERROR AMPLIFIER SECTION Input Voltage VI TPIN1 = 2.5V 2.42 2.50 2.58 V Input Bias Current IBIAS - - -0.3 - 2 uA Open Loop Gain GVO VO = 2V to 4V (NOTE 1) 65 90 - dB Unity Gain Bandwidth GBW TJ= 25 °C (NOTE 1) 0.7 1 - MHz PSRR PSRR VCC = 12V to 25V (NOTE 1) 60 70 - dB Output Sink Current ISINK VPIN2 = 2.7V VPIN1 = 1.1V 26 - mA Output Source Current ISOURCE VPIN2 = 2.3V VPIN1 = 5.0V -0.5 -0.8 - mA Output High Voltage VOH VPIN2 = 2.3V R1 = 15K Ω to GND 56 - V Output Low Voltage VOL VPIN2 = 2.7V R1 = 15K Ω to Pin8 -0.8 1.1 V OUTPUT SECTION Output Low Level VOL ISINK = 20mA - 0.1 0.4 V ISINK = 200mA - 1.5 2.2 V Output High Level VOH ISOURCE = 20mA 13 13.5 - V ISOURCE = 200mA 12 13.5 - V Rise Time tR TJ = 25 °C, C1 = 1nF (NOTE 1) - 40 100 ns Fall Time tF TJ = 25 °C, C1 = 1nF (NOTE 1) - 40 100 ns Output Voltage Swing Limit VOLIM VCC = 27V, C1 = 1nF - 22 - V UNDER VOLTAGE LOCKOUT SECTION Start Threshold VTH UC3842A 15 16 17 V UC3843A 7.8 8.4 9.0 V Min. Operating Voltage ( After turn on ) VTL UC3842A 9 10 11 V UC3843A 7.0 7.6 8.2 V PWM SECTION Maximum Duty Cycle DMAX UC3842A/UC3843A 94 96 100 % Minimum Duty Cycle DMIN - -- 0 % TOTAL STANDBY CURRENT Start-Up Current IST - -0.2 0.4 mA Operating Supply Current ICC VPIN2 = VPIN3 = 0V - 11 17 mA VCC Zener Voltage VZ ICC = 25mA - 29 - V |
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