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UC3844D1 데이터시트(PDF) 4 Page - Fairchild Semiconductor |
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UC3844D1 데이터시트(HTML) 4 Page - Fairchild Semiconductor |
4 / 12 page UC3842/UC3843/UC3844/UC3845 4 Electrical Characteristics (Continued) (VCC=15V, RT=10k Ω, CT=3.3nF, TA= 0°C to +70°C, unless otherwise specified) Adjust VCC above the start threshould before setting at 15V Note: 1. Parameter measured at trip point of latch 2. Gain defined as: 3. These parameters, although guaranteed, are not 100 tested in production. Figure 1. Open Loop Test Circuit High peak currents associated with capacitive loads necessitate careful grounding techniques Timing and bypass capacitors should be connected close to pin 5 in a single point ground. The transistor and 5k Ω potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3. Parameter Symbol Conditions Min. Typ. Max. Unit PWM SECTION Max. Duty Cycle D(Max) UC3842/UC3843 95 97 100 % D(Max) UC3844/UC3845 47 48 50 % Min. Duty Cycle D(MIN) - -- 0 % TOTAL STANDBY CURRENT Start-Up Current IST - -0.45 1 mA Operating Supply Current ICC(OPR) Vpin3=Vpin2=ON - 14 17 mA Zener Voltage VZ ICC = 25mA 30 38 - V A ∆V pin1 ∆V pin3 ------------------ = UC3842 ,0 ≤ Vpin3 ≤ 0.8V |
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