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NCP1252BDR2G Datasheet(PDF) 2 Page - ON Semiconductor |
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NCP1252BDR2G Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 20 page NCP1252 www.onsemi.com 2 Vout NCP1252 Vbulk Vcc 1 2 3 4 8 6 7 5 100 nF* *Minimum recommended decoupling capacitor value Figure 1. Typical Application Table 1. PIN FUNCTIONS Pin No. Pin Name Function Pin Description 1 FB Feedback This pin directly connects to an optocoupler collector. 2 BO Brown−out input This pin monitors the input voltage image to offer a Brown−out protection. 3 CS Current sense Monitors the primary current and allows the selection of the ramp com- pensation amplitude. 4 RT Timing element A resistor connected to ground fixes the switching frequency. 5 GND − The controller ground pin. 6 Drv Driver This pin connects to the MOSFET gate 7 VCC VCC This pin accepts voltage range from 8 V up to 28 V 8 SSTART Soft−start A capacitor connected to ground selects the soft−start duration. The soft start is grounded during the delay timer Table 2. MAXIMUM RATINGS TABLE (Notes 1 and 2) Symbol Rating Value Unit VCC Power Supply voltage, Vcc pin, transient voltage: 10 ms with IVcc < 20 mA 30 V VCC Power Supply voltage, Vcc pin, continuous voltage 28 V IVcc Maximum current injected into pin 7 20 mA Maximum voltage on low power pins (except pin 6, 7) −0.3 to 10 V RθJA – PDIP8 Thermal Resistance Junction−to−Air – PDIP8 131 °C/W RθJA – SOIC8 Thermal Resistance Junction−to−Air – SOIC8 169 °C/W TJMAX Maximum Junction Temperature 150 °C Storage Temperature Range −60 to +150 °C ESD Capability, HBM model 1.8 kV ESD Capability, Machine Model 200 V Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. This device series contains ESD protection and exceeds the following tests: Human Body Model 1800 V per JEDEC Standard JESD22−A114E. Machine Model Method 200 V per JEDEC Standard JESD22−A115A. 2. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78. |
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