Electronic Components Datasheet Search |
|
NCV5500DTADJRKG Datasheet(PDF) 8 Page - ON Semiconductor |
|
NCV5500DTADJRKG Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 13 page NCP5500, NCV5500, NCP5501, NCV5501 http://onsemi.com 8 Figure 21. Measuring Circuits Input Enable Output ADJ GND NCP5500 RL Cin 10 mF Cin2 100 nF EN IADJ IGND IQ IEN Iin Iout Cout NCV5500 Input Output GND RL Cin 10 mF Cin2 100 nF IGND IQ Iin Iout Cout NCP5501 NCV5501 Vout Vin Vout Vin Circuit Description The NCP5500/NCP5501/NCV5500/NCV5501 are integrated linear regulators with a DC load current capability of 500 mA. The output voltage is regulated by a PNP pass transistor controlled by an error amplifier and band gap reference. The choice of a PNP pass element provides the lowest possible dropout voltage, particularly at reduced load currents. Pass transistor base drive current is controlled to prevent oversaturation. The regulator is internally protected by both current limit and thermal shutdown. Thermal shutdown occurs when the junction temperature exceeds 150C. The NCV5500 includes an enable/shutdown pin to turn off the regulator to a low current drain standby state. Regulator The error amplifier compares the reference voltage to a sample of the output voltage (Vout) and drives the base of a PNP series pass transistor via a buffer. The reference is a bandgap design for enhanced temperature stability. Saturation control of the PNP pass transistor is a function of the load current and input voltage. Oversaturation of the output power device is prevented, and quiescent current in the ground pin is minimized. Regulator Stability Considerations The input capacitor is necessary to stabilize the input impedance to reduce transient line influences. The output capacitor helps determine three main characteristics of a linear regulator: startup delay, load transient response and loop stability. The capacitor value and type should be based on cost, availability, size and temperature constraints. Refer to Typical Operating Characteristics for stability regions. Enable Input (NCP5500, NCV5500) The enable pin is used to turn the regulator on or off. By holding the pin at a voltage less than 0.4 V, the output of the regulator will be turned off to a minimal current drain state. When the voltage at the Enable pin is greater than 2.0 V, the output of the regulator will be enabled and rise to the regulated output voltage. The Enable pin may be connected directly to the input pin to provide a constant enable to the regulator. Active Load Protection in Shutdown (NCP5500, NCV5500) When a linear regulator is disabled (shutdown), the output (load) voltage should be zero. However, stray PC board leakage paths, output capacitor dielectric absorption, and inductively coupled power sources can cause an undesirable regulator output voltage if load current is low or zero. The NCV5500 features a load protection network that is active only during Shutdown mode. This network switches in a shunt current path (~500 mA) from Vout to Ground. This feature also provides a controlled (“soft”) discharge path for the output capacitor after a transition from Enable to Shutdown. |
Similar Part No. - NCV5500DTADJRKG |
|
Similar Description - NCV5500DTADJRKG |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |