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NCP1030 Folha de dados(PDF) 2 Page - ON Semiconductor |
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NCP1030 Folha de dados(HTML) 2 Page - ON Semiconductor |
2 / 18 page NCP1030, NCP1031 http://onsemi.com 2 Figure 1. NCP1030/31 Functional Block Diagram Thermal Shutdown One Shot Pulse IO − + Reset Dominant Latch S R 7.5 V/10 V 10 V 6.5 V 2.5 V LEB Reset Dominant Latch SQ R 50 mV − + − + − + − + 2.5 V − + Internal Bias 16 V 10 V 10 V 10 V 10 V GND VFB COMP UV OV Disable 3.0 V/3.5 V + − PWM Latch PWM Comparator Error Amplifier Current Limit Comparator VDRAIN RSENSE 10 V VCC CT I1 I2 = 3I1 Q CT Ramp − + − + 2 k W 4.5 V ISTART FUNCTIONAL PIN DESCRIPTION Pin Name Function Description 1 GND Ground Ground reference pin for the circuit. 2 CT Oscillator Frequency Selection An external capacitor connected to this pin sets the oscillator frequency up to 1 MHz. The oscillator can be synchronized to a higher frequency by charging or discharging CT to trip the internal 3.0 V/3.5 V comparator. If a fault condition exists, the power switch is disabled and the frequency is reduced by a factor of 7. 3 VFB Feedback Input The regulated voltage is scaled down to 2.5 V by means of a resistor divider. Regulation is achieved by comparing the scaled voltage to an internal 2.5 V reference. 4 COMP Error Amplifier Compensation Requires external compensation network between COMP and VFB pins. This pin is effectively grounded if faults are present. 5 OV Line Overvoltage Shutdown Line voltage (Vin) is scaled down using an external resistor divider such that the OV voltage reaches 2.5 V when line voltage reaches its maximum operating voltage. 6 UV Line Undervoltage Shutdown Line voltage is scaled down using an external resistor divider such that the UV voltage reaches 2.5 V when line voltage reaches its minimum operating voltage. 7 VCC Supply Voltage This pin is connected to an external capacitor for energy storage. During Turn−On, the startup circuit sources current to charge the capacitor connected to this pin. When the supply voltage reaches VCC(on), the startup circuit turns OFF and the power switch is enabled if no faults are present. An external winding is used to supply power after initial startup to reduce power dissipation. VCC should not exceed 16 V. 8 VDRAIN Power Switch and Startup Circuits This pin directly connects the Power Switch and Startup Circuits to one of the transformer windings. The internal High Voltage Power Switch Circuit is connected between this pin and ground. VDRAIN should not exceed 200 V. |
Nº de peça semelhante - NCP1030_06 |
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