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CS2845LDW16 Datasheet(PDF) 5 Page - ON Semiconductor |
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CS2845LDW16 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 12 page CS2844, CS3844, CS2845, CS3845 http://onsemi.com 5 ELECTRICAL CHARACTERISTICS (continued) (–25 ° ≤ TA ≤ 85° for CS2844/2845, 0° ≤ TA ≤ 70° for CS3844/CS3845. VCC = 15 V*; RT = 10 kΩ, CT = 3.3 nF for sawtooth mode; unless otherwise stated.) CS2844 CS3844 CS2845/CS3845 Characteristic Test Conditions Min Typ Max Min Typ Max Min Typ Max Unit 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 DIP–8 & SO–8 SO–14 Symbol Symbol Description 1 1 3 COMP Error amp output, used to compensate error amplifier. 2 3 4 VFB Error amp inverting input. 3 5 5 Sense Noninverting input to Current Sense Comparator. 4 7 6 OSC Oscillator timing network with capacitor to ground, resistor to VREF. 5 9 11 GND Ground. – 8 10 Pwr GND Output driver ground. 6 10 12 VOUT Output drive pin. – 11 13 VCC Pwr Output driver positive supply. 7 12 14 VCC Positive power supply. 8 14 15 VREF Output of 5.0 V internal reference. – 2, 4, 6, 13 1, 2, 7, 8, 9, 16 NC No connection. Figure 2. Test Circuit Open Loop Laboratory Test Fixture VREF VCC VOUT GND COMP VFB Sense OSC 0.1 µF 0.1 µF RT 1.0 k Ω 1.0 W 2N2222 100 k Ω VCC VREF VOUT GND A 5.0 k Ω Sense ADJUST CT 4.7 k Ω 4.7 k Ω 1.0 k Ω ERROR AMP ADJUST |
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