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GM3842AS8R Datasheet(PDF) 6 Page - Gamma Microelectronics Inc. |
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GM3842AS8R Datasheet(HTML) 6 Page - Gamma Microelectronics Inc. |
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6 / 8 page  6 GM3842A, GM3843A GM3844A, GM3845A CURRENT MODE PWM CONTROLLER 50 20 5 50 10 1 2 20 10 VCC = 15V TA = 25°C 100 200 300 500 fosc (KHZ) CT = 5nF CT = 10pF CT = 1000pF CT = 200pF CT = 500pF CT = 2nF CT = 1nF Dmax (%) 90 80 70 60 50 40 1 2 3 5 R T (k Figure 3. Maximum Output Duty Cycle vs. Timing Resistor (GM3842A/43A) VCC = 15V CT = 3.3nF TA = 25°C (dB) 80 60 40 20 0 -20 l0 l0k l00k lM l00 lk Figure 4. Error Amp Open-Loop Gain vs. Frequency VCC = 15V VO = 2V to 4V RL = 100K TA = 25°C VTH (V) 1.0 0.8 0.6 0.4 0.2 0 2 4 6 VO (V) Figure 5. Current Sense Input Threshold vs. Error Amp Output Voltage TA = 25°C TA = 125°C VCC = 15V ISC (mA) l00 90 80 70 60 50 0 25 50 75 l00 T A (°C) Figure 6. Reference Short Circuit Current vs. Temperature VCC = 15V Vsat (V) -1 -2 3 2 l 0 0 200 400 600 Io (mA) Figure 7. Output Saturation Voltage vs. Load Current TA= 25°C Source Saturation (Load to Ground) VCC = 15V 50μs Pulsed Load 120Hz Rate Sink Saturation (Load to V +) % 50 Figure 2. Output Dead-Time vs. Oscillator Frequency 30 20 100 10 200 300 500 fosc (kHz) CT = 500pF CT = 200pF CT = 1000pF CT = 5nF CT = 2nF CT = 1nF CT = 10pF VCC = 15V 50 30 20 10 5 2 1 Typical Performance Characteristics Figure 1. Timing Resistor vs. Oscillator Frequency RT (K) 20 l5 10 5 0 0 Figure 8. Supply Current vs. Supply Voltage ISENSE = 0V VFB = 0V RT = 10K TA = 25°C CT = 3.3nF ICC (mA) 10 20 30 VCC (V) |
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