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NCP785BST50T3G Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP785BST50T3G Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 8 page NCP785B http://onsemi.com 7 APPLICATION INFORMATION The typical application circuit for the NCP785B device is shown below. Figure 3. Typical Application Schematic NCP785B VIN VOUT GND CIN 2.2μF COUT 22μF VIN 15V – 450V VOUT 3.3V, 5V, 12V, 15V EN VEN OFF ON Input Decoupling (C1) A 1 mF capacitor either ceramic or electrolytic is recommended and should be connected close to the input pin of NCP785B. Higher value 2.2 mF is necessary to keep the input voltage above the required minimum input voltage at full load for AC voltage as low as 85 V with half wave rectifier. Output Decoupling (C2) The NCP785B Regulator does not require any specific Equivalent Series Resistance (ESR). Thus capacitors exhibiting ESRs ranging from a few m W up to 0.5 W can be used safely. The minimum decoupling value is 22 mF. The regulator accepts ceramic chip capacitors as well as tantalum devices or low ESR electrolytic capacitors. Larger values improve noise rejection and load transient response. Layout Recommendations Please be sure that the VIN and GND lines are sufficiently wide. When the impedance of these lines is high, there is a chance to pick up noise or to cause the malfunction of regulator. Set external components, especially the output capacitor, as close as possible to the circuit, and make leads as short as possible. Thermal As power across the NCP785B increases, it might become necessary to provide some thermal relief. The maximum power dissipation supported by the device is dependent upon board design layout and used package. Mounting pad configuration on the PCB, the board material, and also the ambient temperature affect the rate of temperature rise for the part. This is stating that when the NCP785B has good thermal conductivity through the PCB, the junction temperature will be relatively low with high power dissipation applications. ENABLE Operation The enable pin EN of the NCP785B will turn on or off the regulator’s output. The threshold limits are covered in the electrical specification section of this data sheet. If the enable function is not used then the EN pin should be left disconnected. An internal current source pulls this pin high to a voltage given by the internal resistor divider. The limit of this voltage is mentioned in the electrical specification section of this data sheet. Maximum applicable external voltage at this pin from external source is limited to 5.0 V. + − 1.25 V VIN Thermal Shutdown EN EN NCP785B EN EN 5.3 V VREF 500 kW 600 kW 5 mA ORDERING INFORMATION: Part Number Output Voltage Case Package Marking Shiping Released PN Marking NCP785BST33T3G 3.3 V TBD SOT223−4 HVH TBD PCP785BST33T3G XAH NCP785BST50T3G 5 V TBD SOT223−4 HVJ TBD PCP785BST50T3G XAJ NCP785BST120T3G 12 V TBD SOT223−4 HVK TBD PCP785BST120T3G XAK NCP785BST150T3G 15 V TBD SOT223−4 HVL TBD PCP785BST150T3G XAL |
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