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UC284XBN Fiches technique(PDF) 4 Page - ON Semiconductor |
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UC284XBN Fiches technique(HTML) 4 Page - ON Semiconductor |
4 / 20 page UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV http://onsemi.com 4 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, BV Characteristics Symbol Min Typ Max Min Typ Max Unit PWM SECTION Duty Cycle Maximum (UC284XB, UC384XB) Maximum (UC384XBV) Minimum DC(max) DC(min) 94 – – 96 – – – – 0 94 93 – 96 96 – – – 0 % TOTAL DEVICE Power Supply Current Startup (VCC = 6.5 V for UCX843B, Startup (VCC 14 V for UCX842B, BV) Operating (Note 8) ICC + IC – – 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 UC3842B, UC3843B; –25°C for UC2842B, UC2843B; –40°C for UC3842BV, UC3843BV Thigh = +70°C for UC3842B, UC3843B; +85°C for UC2842B, UC2843B; +105°C for UC3842BV, UC3843BV NCV3843BV: Tlow = –40°C, Thigh = +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and change control. 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) VCC = 15 V TA = 25°C Figure 2. Timing Resistor versus Oscillator Frequency Figure 3. Output Deadtime versus Oscillator Frequency 1.0 M 500 k 200 k 100 k 50 k 20 k 10 k fOSC, OSCILLATOR FREQUENCY (kHz) 1.0 2.0 5.0 10 20 50 100 1 2 Figure 4. Oscillator Discharge Current versus Temperature Figure 5. Maximum Output Duty Cycle versus Timing Resistor 7.0 -55 TA, AMBIENT TEMPERATURE (°C) -25 0 25 50 75 100 125 7.5 8.0 8.5 9.0 VCC = 15 V VOSC = 2.0 V 40 0.8 RT, TIMING RESISTOR (kΩ) 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 50 60 70 80 90 100 Idischg = 7.5 mA VCC = 15 V CT = 3.3 nF TA = 25°C 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 5 Idischg = 8.8 mA 7 3 6 4 VCC = 15 V TA = 25°C |
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