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UC2844DR2G Datasheet(PDF) 4 Page - ON Semiconductor |
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UC2844DR2G Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 16 page UC3844, UC3845, UC2844, UC2845 http://onsemi.com 4 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 Figure 2. Timing Resistor versus Oscillator Frequency Figure 3. Output Deadtime versus Oscillator Frequency Figure 4. Error Amp Small Signal Transient Response Figure 5. Error Amp Large Signal Transient Response 0.5 ms/DIV VCC = 15 V AV = −1.0 TA = 25°C VCC = 15 V AV = −1.0 TA = 25°C 1.0 ms/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 6. Error Amp Open Loop Gain and Phase versus Frequency Figure 7. 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 10 0 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 |
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