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NCP1239ED65R2G Datasheet(PDF) 24 Page - ON Semiconductor |
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NCP1239ED65R2G Datasheet(HTML) 24 Page - ON Semiconductor |
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24 / 25 page  NCP1239 www.onsemi.com 24 SOFT-START Soft-start is achieved by ramping up an internal reference, VSSTART, and comparing it to current sense signal. VSSTART ramps up from 0 V once the controller powers up. The setpoint rise is then limited by the VSSTART ramp so that a gradual increase of the power switch current during start-up. The soft-start duration (that is, the time necessary for the ramp to reach the VILIM1 steady state current limit), tSSTART, is typically 8 ms. DRIVER The NCP1239 maximum supply voltage, VCC(max), is 25.5 V. Typical high-voltage MOSFETs have a maximum gate-source voltage rating of 20 V. The DRV pin incorporates an active voltage clamp to limit the gate voltage on the external MOSFETs. The DRV voltage clamp, VDRV(high) is typically 13.5 V with a maximum limit of 16 V. THERMAL SHUTDOWN An internal thermal shutdown circuit monitors the junction temperature of the IC. The controller is disabled if the junction temperature exceeds the thermal shutdown threshold, TSHDN, typically 150 _C. A continuous VCC hiccup is initiated after a thermal shutdown fault is detected. The controller restarts at the next VCC(on) once the IC temperature drops below below TSHDN by the thermal shutdown hysteresis, TSHDN(HYS), typically 20 _C. The thermal shutdown is also cleared if VCC drops below VCC(reset) or a brown-out fault is detected. A new power up sequences commences at the next VCC(on) once all the faults are removed. Table 5. ORDERING INFORMATION Device Marking Freq. OCP Protection VCC OVP Protection Fault Pin Protection BO Levels Package Shipping† NCP1239AD65R2G 1239A065 65 kHz Latch Latch Latch 110/101 SOIC−7 (Pb-Free) 2500 / Tape & Reel NCP1239BD65R2G 1239B065 65 kHz Auto-Recovery Latch Latch 110/101 NCP1239CD65R2G 1239C065 65 kHz Auto-Recovery Auto-Recovery Latch 110/101 NCP1239DD65R2G 1239D065 65 kHz Auto-Recovery Latch Latch 101/95 NCP1239ED65R2G 1239E065 65 kHz Auto-Recovery Auto-Recovery Auto-Recovery 110/101 NCP1239AD100R2G 1239A100 100 kHz Latch Latch Latch 110/101 NCP1239BD100R2G 1239B100 100 kHz Auto-Recovery Latch Latch 110/101 †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. |
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