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NCP59151DS28R4G Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP59151DS28R4G Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 14 page NCP59150, NCV59150 Series http://onsemi.com 8 TYPICAL CHARACTERISTICS Figure 21. Line Transient Response Figure 22. Load Transient Response APPLICATIONS INFORMATION Output Capacitor and Stability The NCP59150 series requires an output capacitor for stable operation. The NCP59150 series is designed to operate with ceramic output capacitors. The recommended output capacitance value is 47 mF or greater. Such capacitors help to improve transient response and noise reduction at high frequency. Input Capacitor An input capacitor of 1.0 mF or greater is recommended when the device is more than 4 inches away from the bulk supply capacitance, or when the supply is a battery. Small, surface−mount chip capacitors can be used for the bypassing. The capacitor should be place within 1 inch of the device for optimal performance. Larger values will help to improve ripple rejection by bypassing the input of the regulator, further improving the integrity of the output voltage. Minimum Load Current The NCP59150 regulator is specified between finite loads. A 5 mA minimum load current is necessary for proper operation. Error Flag Some NCP59150 series members feature an error flag circuit that monitors the output voltage and signals an error condition when the voltage is 5% below the nominal output voltage. The error flag is an open−collector output that can sink up to 5 mA typically during a VOUT fault condition. The FLG output is overload protected when a short circuit of the pullup load resistor occurs in the application. This is guaranteed in the full range of FLG output voltage Max ratings (see Max Ratings table). Please be aware operation in this mode is not recommended, power dissipated in the device can impact on output voltage precision and other device characteristics. Enable Input Some NCP59150 series members also feature an enable input for on/off control of the device. It’s shutdown state draws “zero” current from input voltage supply (only microamperes of leakage). The enable input is TTL/CMOS compatible for simple logic interface, but can be connected up to VIN. Overcurrent and Reverse Output Current Protection The NCP59150 regulator is fully protected from damage due to output current overload and output short conditions. When NCP59150 output is overloaded, Output Current limiting is provided. This limiting is linear; output current during overload or output short conditions is constant. These features are advantageous for powering FPGAs and other ICs having current consumption higher than nominal during their startup. Thermal shutdown disables the NCP59150 device when the die temperature exceeds the maximum safe operating temperature. When NCP59150 is disabled and (VOUT – VIN) voltage difference is less than 6.5 V in the application, the output structure of these regulators is able to withstand output voltage (backup battery as example) to be applied without reverse current flow. Of course the additional current flowing through the feedback resistor divider inside the Fixed Voltage devices (30 mA typically at nominal output voltage) needs to be included in the backup battery discharging calculations. Adjustable Voltage Design The NCP/NCV59152 Adjustable voltage Device Output voltage is set by the ratio of two external resistors as shown in Figure 23. The device maintains the voltage at the ADJ pin at 1.24 V referenced to ground. The current in R2 is then equal to |
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