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CS2843ALN8 Datasheet(PDF) 5 Page - ON Semiconductor |
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CS2843ALN8 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 10 page CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com 5 ELECTRICAL CHARACTERISTICS (continued) (−25° ≤ TA ≤ 85° for CS2842A/CS2843A, 0° ≤ TA ≤ 70° for CS3842A/CS3843A. VCC = 15 V*; RT = 680 Ω, CT = 0.022 μF for triangular mode, RT = 10 kΩ, CT = 3.3 nF for sawtooth mode (see Figure 7); unless otherwise stated.) Characteristic Test Conditions CS2842A CS3842A CS2843A/CS3843A Unit Min Typ Max Min Typ Max Min Typ Max Undervoltage Lockout Section Start Threshold − 15 16 17 14.5 16 17.5 7.8 8.4 9.0 V Min. Operating Voltage After Turn On 9.0 10 11 8.5 10 11.5 7.0 7.6 8.2 V *Adjust VCC above the start threshold before setting at 15 V. PACKAGE PIN DESCRIPTION Package Pin Number Symbol Description DIP−8 SO−8 SO−14 1 1 1 COMP Error amp output, used to compensate error amplifier. 2 2 3 VFB Error amp inverting input. 3 3 5 Sense Noninverting input to Current Sense Comparator. 4 4 7 OSC Oscillator timing network with capacitor to ground, resistor to VREF. 5 5 8 GND Ground. − − 9 Pwr GND Output driver ground. 6 6 10 VOUT Output drive pin. − − 11 VCC Pwr Output driver positive supply. 7 7 12 VCC Positive power supply. 8 8 14 VREF Output of 5.0 V internal reference. − − 2, 4, 6, 13 NC No connection. TYPICAL PERFORMANCE CHARACTERISTICS Figure 2. Oscillator Frequency vs. CT Figure 3. Oscillator Duty Cycle vs. RT 900 800 700 600 500 .0005 .001 .002 .04 .05 CT (μF) 400 300 200 100 .03 .02 .01 .003 .005 RT = 680 Ω RT = 1.5 kΩ RT = 10 kΩ 100 90 80 70 50 RT (Ω) 40 30 20 10 60 |
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