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PI4091，Pololu 5V, 5.5A 降壓穩壓器模組（D36V50F5）Step-Down Voltage Regulator
| Output voltage | Typical max output current1 | Input voltage range2 |
| 5 V | 5.5 A | 5.5 V – 50 V |
Note 1： Typical continuous output current at 36 V in. Actual achievable continuous output current is a function of input voltage and is limited by thermal dissipation. See the output current graphs on the product pages for more information.
Note 2： Minimum input voltage is subject to dropout voltage considerations; see the dropout voltage section of product pages for more information.
這些參數變化的替代方案：
This family includes six versions with fixed output voltages ranging from 3.3 V to 12 V：（ 6 個版本）
- D36V50F3：Fixed 3.3V output
- D36V50F5：Fixed 5V output
- D36V50F6：Fixed 6V output
- D36V50F7：Fixed 7.5V output
- D36V50F9：Fixed 9V output
- D36V50F12：Fixed 12V output
The D36V50Fx family of buck (step-down) voltage regulators generates lower output voltages from input voltages as high as 50 V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters), which makes them much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. These regulators can typically support continuous output currents between 2 A and 9 A, depending on the input voltage and output voltage (see the Maximum continuous output current section below). In general, the available output current is a little higher for the lower-voltage versions than it is for the higher-voltage versions, and it decreases as the input voltage increases.
The regulators have input reverse voltage protection up to 40 V, output undervoltage and overvoltage protection, over-current protection, and short-circuit protection. A thermal shutdown feature also helps prevent damage from overheating and a soft-start feature limits the inrush current and gradually ramps the output voltage on startup.／穩壓器具有高達 40 V 的輸入反向電壓保護、輸出欠壓和過壓保護、過流保護和短路保護。熱關斷功能還有助於防止過熱造成的損壞，軟啟動功能可限制浪湧電流並在啟動時逐漸增加輸出電壓。
If you do not need quite as much current, consider the very similar D36V28Fx or D30V30Fx families of step-down voltage regulators, which can deliver up to around 4 A in a wide range of output voltages.
| We manufacture these boards in-house at our Las Vegas facility, which gives us the flexibility to make these regulators with customized components to better meet the needs of your project. For example, if you have an application where the input voltage will always be below 20 V and efficiency is very important, we can make these regulators a bit more efficient at high loads by replacing the 40V reverse voltage protection MOSFET with a 20V one. We can also customize the output voltage. If you are interested in customization, please contact us. |
［Features］：
- Input voltage： 5.5V to 50V
(minimum input subject to dropout voltage considerations; see the dropout voltage section for details) - Output voltage: 5V with 4% accuracy
- Typical maximum continuous output current: 3.5A to 8A
(see the maximum continuous output current graph below) - Typical efficiency of 80% to 95%, depending on input voltage, output voltage, and load
(see the efficiency graph below) - Switching frequency： ~500 kHz under heavy loads
- Power-save mode with ultrasonic operation that increases light load efficiency by reducing switching frequency, but keeps it above the audible range (20 kHz)
- 2mA to 4mA typical no-load quiescent current (see the quiescent current graph below)
- Enable input with precise cutoff threshold for disconnecting the load and putting the regulator into a low-power state that draws approximately 10µA to 20µA per volt on VIN
- “Power good” output indicates when the regulator cannot adequately maintain the output voltage
- Output undervoltage and overvoltage protection
- Soft-start feature limits inrush current and gradually ramps output voltage
- Integrated reverse-voltage protection up to 40V, over-current and short-circuit protection, over-temperature shutoff
- Compact size： 1″ × 1″ × 0.375″ (25.4 mm × 25.4 mm × 9.5 mm)
- Three 0.086″ mounting holes for #2 or M2 screws
［Connections］
This regulator has six connections, some of which are duplicated on multiple pins: power good (PG), enable (EN), input voltage (VIN), input voltage after reverse protection (VRP), output voltage (VOUT), and ground (GND).
The “power good” indicator, PG, is an open-drain output that goes low when the regulator’s output voltage either rises more than 20% above or falls more than 10% below the nominal voltage (with hysteresis). An external pull-up resistor is required to use this pin.
The regulator, which is enabled by default, can be put into a low-power sleep state by reducing the voltage on the EN pin below 1.2 V, and it can be brought out of this state again by increasing the voltage on EN past 1.35 V. The quiescent current draw in this sleep mode is dominated by the current in the 100 kΩ pull-up resistor from ENABLE to VIN and in the reverse-voltage protection circuit, which altogether will be between 10 µA and 20 µA per volt on VIN. The tight tolerance of the enable input allows a precise low-VIN cutoff to be set, such as with the output of an external voltage divider powered by VIN, which is useful for battery powered applications where draining the battery below a particular voltage threshold could permanently damage it.
The input voltage, VIN, powers the regulator. Voltages between 4.5 V and 50 V can be applied to VIN, but generally the effective lower limit of VIN is VOUT plus the regulator’s dropout voltage, which varies approximately linearly with the load (see below for graphs of the dropout voltage as a function of the load).
VRP provides access to the input voltage after reverse-voltage protection; this can be used as an output to power other devices, or the input voltage can be connected to VRP instead of VIN to bypass the reverse protection.
VOUT is the regulated output voltage.
All of the connections are arranged on a 0.1″ grid for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1″ grid. The PG connection is the only one not accessible along the edge of the board. A 1×12 or two 1×6 straight male header strips are included with the regulator.
The power connections (VIN, VRP, VOUT, and GND) are duplicated across both rows of through-holes, allowing two header pins to be used for each connection. Note that the EN and PG pins are not duplicated and are adjacent on different rows, so if you intend to use the regulator on a breadboard, be careful to avoid installing header pins in a way that shorts EN to PG. (In the picture below, note that the PG pin is omitted to avoid shorting it to EN.)
Each header pin is only rated for 3 A (6 A combined per pair), and solderless breadboards are usually not intended to handle more than a few amps, so for higher-power applications, thick wires should be soldered directly to the board.
