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UC3844 Datenblatt(PDF) 4 Page - Motorola, Inc |
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UC3844 Datenblatt(HTML) 4 Page - Motorola, Inc |
4 / 14 page UC3844, 45 UC2844, 45 4 MOTOROLA ANALOG IC DEVICE DATA Figure 1. Timing Resistor versus Oscillator Frequency Figure 2. Output Deadtime versus Oscillator Frequency Figure 3. Error Amp Small Signal Transient Response Figure 4. Error Amp Large Signal Transient Response 0.5 µs/DIV VCC = 15 V AV = –1.0 TA = 25°C VCC = 15 V AV = –1.0 TA = 25°C 1.0 µs/DIV 10 k 20 k 50 k 100 k 200 k 500 k 1.0 M fosc, OSCILLATOR FREQUENCY (Hz) VCC = 15 V TA = 25°C 10 k 20 k 50 k 100 k 200 k 500 k 1.0 M fosc, OSCILLATOR FREQUENCY (Hz) Figure 5. Error Amp Open Loop Gain and Phase versus Frequency Figure 6. Current Sense Input Threshold versus Error Amp Output Voltage NOTE: Output switches at one–half the oscillator frequency. CT = 10 nF 5.0 nF 2.0 nF 1.0 nF 100 pF 500 pF 200 pF 2.55 V 2.5 V 2.45 V 2.5 V 3.0 V 2.0 V 100 50 20 10 5.0 2.0 1.0 75 70 65 60 55 50 –20 10 M 10 f, FREQUENCY (Hz) Gain Phase VCC = 15 V VO = 2.0 V to 4.0 V RL = 100 K TA = 25°C 0 30 60 90 120 150 180 100 1.0 k 10 k 100 k 1.0 M 0 20 40 60 80 100 0 VO, ERROR AMP OUTPUT VOLTAGE (V) 0 0.2 0.4 0.6 0.8 1.0 1.2 2.0 4.0 6.0 8.0 VCC = 15 V TA = 25°C TA = –55°C TA = 125°C |
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