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CM3842/3843 CURRENT MODE PWM CONTROLLER 2001/06/27 Advanced Champion Microelectronic Corporation Page 5 ELECTRICAL CHARACTERISTICS (Continued) Error Amplifier Section Input Bias Current IBIAS -0.1 -2 µA Input Voltage VI(EA) COMP = 2.5V 2.42 2.50 2.58 V Open Loop Voltage Gain GVO 2V ≤ VO ≤ 4V 65 90 dB Unity Gain Bandwidth (note 8) UGBW TJ = 25 OC 0.7 1 MHz Power Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V 60 70 dB Output Sink Current ISINK VFB = 2.7V, COMP = 1.1V 2 7 mA Output Source Current ISOURCE VFB = 2.3V, COMP = 5.0V -0.5 -1.0 mA High Output Voltage VOH VFB = 2.3V, RL = 15K Ω to GND 5 6 V Low Output Voltage VOL VFB = 2.7V, RL = 15K Ω to VREF 0.7 1.1 V Output Section ISINK = 20mA 0.1 0.4 Output Low Level VOL ISINK = 200mA 1.4 2.2 V ISOURCE = 20mA 13 13.5 Output High Level VOH ISOURCE = 200mA 12 13.0 V Rise Time (note 8) tr TJ = 25 OC, CL = 1nF 50 150 ns Fall Time (note 8) tf TJ = 25 OC, CL = 1nF 50 150 ns Under-Voltage Lockout Section CM3842 14.5 16.0 17.5 Start Threshold VTH(ST) CM3843 7.8 8.4 9.0 V CM3842 8.5 10 11.5 Min. Operating Voltage CM3843 7.0 7.6 8.2 V PWM Section CM3842/43 94 97 100 Maximum Duty Cycle % Minimum Duty Cycle 0 % Total Standby Current CM3842 0.2 0.35 Startup Current CM3843 0.5 1.0 mA Operating Supply Current ICC VFB = ISENSE = 0V 14 17 mA Zener Voltage VZ ICC = 25mA 30 35 V note 7: Adjust VCC above the start threshold before setting at 15V note 8: These parameters, although guaranteed, are not 100% tested in production prior to shipment note 9: Parameters are measured at trip point of latch with VFB = 2V note 10: Gain is measured between ISENSE and COMP with the input changing from 0V to 0.8V |
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