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UC2845BDR2G Fiches technique(PDF) 5 Page - ON Semiconductor |
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UC2845BDR2G Fiches technique(HTML) 5 Page - ON Semiconductor |
5 / 20 page UC3844B, UC3845B, UC2844B, UC2845B http://onsemi.com 5 ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 8], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 9], unless otherwise noted.) UC284XB UC384XB, XBV Characteristic Symbol Min Typ Max Min Typ Max Unit PWM SECTION Duty Cycle Maximum (UC284XB, UC384XB) Maximum (UC384XBV) Minimum DC(max) DC(min) 47 − − 48 − − 50 − 0 47 46 − 48 48 − 50 50 0 % TOTAL DEVICE Power Supply Current Startup (VCC = 6.5 V for UCX845B, Startup (VCC = 14 V for UCX844B, BV) Operating (Note 8) ICC − − 0.3 12 0.5 17 − − 0.3 12 0.5 17 mA Power Supply Zener Voltage (ICC = 25 mA) VZ 30 36 − 30 36 − V 8. Adjust VCC above the Startup threshold before setting to 15 V. 9. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Tlow =0°C for UC3844B, UC3845B Thigh =+ 70°C for UC3844B, UC3845B =− 25 °C for UC2844B, UC2845B = + 85 °C for UC2844B, UC2845B =− 40 °C for UC3844BV, UC3845BV = +105 °C for UC3844BV, UC3845BV 0.8 2.0 5.0 8.0 20 50 80 1.0 M 500 k 200 k 100 k 50 k 20 k 10 k fOSC, OSCILLATOR FREQUENCY (kHz) Figure 2. Timing Resistor versus Oscillator Frequency Figure 3. Output Deadtime versus Oscillator Frequency 1.0 M 100 k 10 k fOSC, OSCILLATOR FREQUENCY (kHz) 50 1.CT = 10 nF 2.CT = 5.0 nF 3.CT = 2.0 nF 4.CT = 1.0 nF 5.CT = 500 pF 6.CT = 200 pF 7.CT = 100 pF 55 60 65 70 75 20 k 50 k 200 k 500 k 2 3 7 5 6 NOTE: Output switches at 1/2 the oscillator frequency VCC = 15 V TA = 25°C 0.5 ms/DIV 2.55 V 2.5 V 2.45 V VCC = 15 V AV = −1.0 TA = 25°C VCC = 15 V AV = −1.0 TA = 25°C 1.0 ms/DIV 2.5 V 3.0 V 2.0 V Figure 4. Error Amp Small Signal Transient Response Figure 5. Error Amp Large Signal Transient Response 1 4 |
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