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CS5124 Datasheet(PDF) 5 Page - ON Semiconductor |
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CS5124 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 11 page CS5124 http://onsemi.com 5 PACKAGE PIN DESCRIPTION PIN # Pin Description 1 VCC VCC Power Input Pin. 2 BIAS VCC Clamp Output Pin. This pin will control the gate of an N−channel MOSFET that in turn regulates Vcc. This pin is internally clamped at 15 V when the IC is in sleep mode. 3 UVLO Sleep and under voltage lockout pin. A voltage greater than 1.8 V causes the chip to “wake up” however the GATE remains low. A voltage greater than 2.6 V on this pin allows the output to switch. 4 SS Soft−Start Capacitor Pin. A capacitor placed between SS and GROUND is charged with 10 mA and discharged with 10 mA. The Soft−Start capacitor controls both Soft−Start time and hiccup mode frequency. 5 VFB Voltage Feedback Pin. The collector of an optocoupler is typically tied to this pin. This pin is pulled up internally by a 4.3 kW resistor to 5.0 V and is clamped internally at 2.9 V (2.65 V). If VFB is pulled > 4.0 V, the oscillator is disabled and GATE will stay high. If the VFB pin is pulled < 0.49 V, GATE will stay low. 6 ISENSE Current Sense Pin. This pin is connected to the current sense resistor on the primary side. If VFB is floating, the GATE will go low if ISENSE = 195 mV (335 mV). If ISENSE > 275 mV (525 mV), Soft−Start will be initiated. 7 GATE Gate Drive Output Pin. Capable of driving a 3.0 nF load. GATE is nominally clamped to 13.5 V. 8 GND Ground Pin. |
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