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NCP1340 Datasheet(PDF) 3 Page - ON Semiconductor |
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NCP1340 Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 32 page NCP1340 www.onsemi.com 3 FUNCTIONAL BLOCK DIAGRAM Figure 3. NCP1340 Block Diagram Table 2. PIN FUNCTIONAL DESCRIPTION 8−Pin 9−Pin Pin Name Function 1 1 Fault The controller enters fault mode if the voltage on this pin is pulled above or below the fault thresholds. A precise pull up current source allows direct interface with an NTC thermistor. − 2 FMAX A resistor to ground sets the value for the maximum switching frequency clamp. If this pin is pulled above 4 V, the maximum frequency clamp is disabled. 2 3 FB Feedback input for the QR Flyback controller. Allows direct connection to an optocoupler. 3 4 ZCD/OPP A resistor divider from the auxiliary winding to this pin provides input to the demagnetization de- tection comparator and sets the OPP compensation level. 4 5 CS Input to the cycle−by−cycle current limit comparator. 5 6 GND Ground reference. 6 7 DRV This is the drive pin of the circuit. The DRV high−current capability (−0.5 /+0.8 A) makes it suit- able to effectively drive high gate charge power MOSFETs. 7 8 VCC This pin is the positive supply of the IC. The circuit starts to operate when VCC exceeds 17 V and turns off when VCC goes below 9 V (typical values). After start−up, the operating range is 9 V up to 28 V. − 9 N/C Removed for creepage distance. 8 10 HV This pin is the input for the high voltage startup and brownout detection circuits. It also contains the line removal detection circuit to safely discharge the X2 capacitors when the line is removed. |
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