產品說明
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輸出電壓 VOUT 是固定的，取決於穩壓器版本：
D24V10F3 版本輸出 3.3 V，
D24V10F5 版本輸出 5 V，
D24V10F6 版本輸出 6 V，
D24V10F9 版本輸出 9 V，
D24V10F12 版本輸出 12 V
The compact (0.5″ × 0.7″) D24V10F5 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to 5 V while allowing for a maximum output current of 1 A. This regulator offers typical efficiencies between 85% and 90% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 5 V. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.
緊湊型 (0.5" × 0.7") D24V10F5 同步降壓穩壓器採用高達 36 V 的輸入電壓並有效地將其降至 5 V，同時允許 1 A 的最大輸出電流。該穩壓器的典型效率介於 85% 和 90% 並且具有非常低的壓差，因此它可以用於低至 5 V 以上幾百毫伏的輸入電壓。引腳間距為 0.1 英寸，使該板與標準無焊麵包板和穿孔板兼容。
【Features】
- Input voltage: [output voltage + dropout voltage] to 36 V 輸入電壓 (see below for more information on dropout voltage)
- Fixed 3.3 V, 5 V, 6 V, 9 V, or 12 V output 輸出電壓 (depending on regulator version) with 4% accuracy
- Maximum output current: 1 A
- Typical efficiency of 80% to 93%
- 500 kHz switching frequency (when not in power-save mode)
- 2 ms soft-start reduces in-rush current on power-up
- 200 μA typical no-load quiescent current
- Over-current and short-circuit protection, over-temperature shutoff／過流和短路保護，過熱關斷
- Small size: 0.7″ × 0.5″ × 0.14″ (18 mm × 13 mm × 3.5 mm)
相關文件
Overview
The D24V10Fx family of step-down voltage regulators features the Intersil ISL85410 1A synchronous buck regulator and generates lower output voltages from input voltages as high as 36 V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) with typical efficiencies between 80% and 95%, which is much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. These regulators have a power-save mode that activates at light loads and a low quiescent (no load) current draw, which make them well suited for applications that are run from a battery. These regulators are available in five different fixed output voltages:
D24V10Fx 系列降壓穩壓器採用 Intersil ISL85410 1A 同步降壓穩壓器，可從高達 36 V 的輸入電壓產生較低的輸出電壓。它們是開關穩壓器（也稱為開關模式電源 (SMPS) 或 DC-to -DC 轉換器），典型效率在 80% 和 95% 之間，比線性穩壓器效率高得多，尤其是在輸入和輸出電壓之間的差異很大時。 這些穩壓器具有在輕負載時激活的省電模式和低靜態（無負載）電流消耗，這使得它們非常適合由電池供電的應用。 這些穩壓器有五種不同的固定輸出電壓：
Alternatives available with variations in these parameter(s): output voltage Select variant… 可用這些參數變化的替代方案：輸出電壓選擇變體…
The different versions of this regulator all look very similar, so the bottom silkscreen includes a blank space where you can add your own distinguishing marks or labels. This product page applies to all five versions of the D24V10Fx family.／該調節器的不同版本看起來都非常相似，因此底部絲印包括一個空白區域，您可以在其中添加自己的區分標記或標籤。 本產品頁面適用於 D24V10Fx 系列的所有五個版本。
The SHDN pin can be used to put the board in a low-power state that reduces the quiescent current to approximately 10 µA to 20 µA per volt on VIN, and a PG (power good) output can be used to monitor the state of the regulator’s output voltage.／SHDN 引腳可用於將電路板置於低功耗狀態，從而將 VIN 上每伏特的靜態電流降低到大約 10 µA 至 20 µA，PG（電源良好）輸出可用於監控 穩壓器的輸出電壓。
The regulators feature short-circuit/over-current protection, and thermal shutdown helps prevent damage from overheating. The boards do not have reverse-voltage protection.／穩壓器具有短路/過流保護功能，熱關斷功能有助於防止因過熱而損壞。 電路板沒有反向電壓保護。
If you do not need quite as much current, consider the very similar D24V5Fx family of step-down voltage regulators, which can deliver up to 500 mA in a wide range of output voltages:／如果您不需要那麼多電流，請考慮非常相似的 D24V5Fx 系列降壓穩壓器，它可以在很寬的輸出電壓範圍內提供高達 500 mA 的電流：
Alternatives available with variations in these parameter(s): output voltage Select variant…／可用這些參數變化的替代方案：輸出電壓選擇變體…
The picture on the right shows a 1 A D24V10Fx regulator next to a 0.5 A D24V5Fx regulator and a common 7805 linear regulator in a TO-220 package.／右圖顯示了一個 1 A D24V10Fx 穩壓器，旁邊是一個 0.5 A D24V5Fx 穩壓器和一個採用 TO-220 封裝的普通 7805 線性穩壓器。
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【Using the regulator／使用調節器】
［Connections／連接］
The buck regulator has five connections: power good (PG). shutdown (SHDN), input voltage (VIN), ground (GND), and output voltage (VOUT).／
降壓穩壓器有五個連接：電源良好（PG）。關斷 （SHDN）、輸入電壓 （VIN）、地 （GND） 和輸出電壓 （VOUT）。
The “power good” indicator, PG, is an open-drain output that drives low when the regulator’s output voltage falls below 80% or rises above 120% of its target output voltage. This output is also actively held low for the duration of the regulator’s 2 ms soft-start period and while the regulator is being disabled by the SHDN input or by over-temperature or over-current fault conditions. An external pull-up resistor is generally required to use this pin.／
“電源良好”指示器PG是一種漏極開路輸出，當穩壓器的輸出電壓降至80%以下或高於其目標輸出電壓的120%時，該輸出將驅動為低電平。在穩壓器的 2 ms 軟啟動期間，以及穩壓器被 SHDN 輸入或過熱或過流故障情況禁用時，該輸出也保持為低電平。通常需要一個外部上拉電阻器來使用此引腳。
The SHDN pin can be driven low (under 0.4 V) to turn off the output and put the board into a low-power state. There is a 100 kΩ pull-up resistor between the SHDN pin and VIN, so if you want to leave the board permanently enabled, the SHDN pin can be left disconnected. While the SHDN pin is being driven low, the current draw of the regulator is dominated by the current through the pull-up resistor and will be proportional to the input voltage. (At 36 V in it will draw about 360 μA.)
SHDN引腳可被驅動為低電平（低於0.4 V），以關閉輸出並將電路板置於低功耗狀態。SHDN引腳和VIN之間有一個100 kΩ上拉電阻，因此，如果要使電路板永久使能，可以保持SHDN引腳斷開連接。當SHDN引腳被驅動為低電平時，穩壓器的電流消耗由通過上拉電阻的電流主導，並且將與輸入電壓成正比。（在 36 V 時，它將消耗約 360 μA。
The input voltage, VIN, powers the regulator. Voltages between 3 V and 36 V can be applied to VIN, but 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 dropout voltages as a function of the load). Additionally, please be wary of destructive LC spikes (see below for more information).
輸入電壓 VIN 為穩壓器供電。VIN可以施加3 V至36 V之間的電壓，但VIN的有效下限是VOUT加上穩壓器的壓差，該壓差隨負載大致呈線性變化（有關壓差電壓隨負載的函數關係圖，請參見下文）。此外，請警惕破壞性的LC峰值（有關更多資訊，請參閱下文）。
The output voltage, VOUT, is fixed and depends on the regulator version: the D24V10F3 version outputs 3.3 V, the D24V10F5 version outputs 5 V, the D24V10F6 version outputs 6 V, the D24V10F9 version outputs 9 V, and the D24V10F12 version outputs 12 V.
輸出電壓 VOUT 是固定的，取決於穩壓器版本：
D24V10F3 版本輸出 3.3 V，
D24V10F5 版本輸出 5 V，
D24V10F6 版本輸出 6 V，
D24V10F9 版本輸出 9 V，
D24V10F12 版本輸出 12 V。
The five connections are labeled on the back side of the PCB and are arranged with a 0.1″ spacing along the edge of the board for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1″ grid. You can solder wires directly to the board or solder in either the 5×1 straight male header strip or the 5×1 right-angle male header strip that is included.
這五個連接在PCB的背面貼上標籤，並沿著電路板邊緣以0.1“的間距排列，以便與無焊試驗板，連接器和其他使用0.1”網格的原型設計配置相容。您可以將電線直接焊接到電路板上，也可以焊接在隨附的 5×1 直公頭條或 5×1 直角公頭條中。
相關資訊
Typical efficiency and output current
The efficiency of a voltage regulator, defined as (Power out)/(Power in), is an important measure of its performance, especially when battery life or heat are concerns. This family of switching regulators typically has an efficiency of 80% to 93%, though the actual efficiency in a given system depends on input voltage, output voltage, and output current. See the efficiency graph near the bottom of this page for more information.
In order to achieve a high efficiency at low loads, this regulator automatically goes into a power-save mode where the switching frequency is reduced. In power-save mode, the switching frequency of the regulator changes as necessary to minimize power loss. This could make it harder to filter out noise on the output caused by switching.
Typical dropout voltage
The dropout voltage of a step-down regulator is the minimum amount by which the input voltage must exceed the regulator’s target output voltage in order to ensure the target output can be achieved. For example, if a 5 V regulator has a 1 V dropout voltage, the input must be at least 6 V to ensure the output is the full 5 V. Generally speaking, the dropout voltage increases as the output current increases. See the “Details” section below for more information on the dropout voltage for this specific regulator version.
Details for item #2831
The graphs below show the typical efficiency and dropout voltage of the 5 V D24V10F5 regulator as a function of the output current:
During normal operation, this product can get hot enough to burn you. Take care when handling this product or other components connected to it.
Schematic diagram
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| Schematic diagram for the Pololu D24V10Fx family of 1 A step-down voltage regulators. |
LC voltage spikes
When connecting voltage to electronic circuits, the initial rush of current can cause voltage spikes that are much higher than the input voltage. If these spikes exceed the regulator’s maximum voltage (36 V), the regulator can be destroyed. In our tests with typical power leads (~30″ test clips), input voltages above 20 V caused spikes over 36 V.
If you are connecting more than 20 V or your power leads or supply has high inductance, we recommend soldering a 33 μF or larger electrolytic capacitor close to the regulator between VIN and GND. The capacitor should be rated for at least 50 V.
More information about LC spikes can be found in our application note, Understanding Destructive LC Voltage Spikes.
