C&D西恩迪LSN-3.3/10-D12-C模块电源技术详解

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"C&D西恩迪的LSN-3.3/10-D12-C模块电源说明书详细介绍了这款非隔离式DC/DC转换器的特性、功能和应用。" LSN-3.3/10-D12-C模块电源是C&D西恩迪公司的一款高效能、小型化的直流电源转换解决方案，主要适用于12V输入到1-5V输出的非隔离式降压（buck）调节场景。该模块的最大特点是其在最小的空间内实现了最高的效率，可提供10安培的满载输出电流，并且在10.8V至13.2V的输入电压范围内工作。该系列产品的特点包括： 1. **非隔离设计**：LSN-12AD12模型采用非隔离架构，适合在不需要电气隔离的应用中使用，简化了系统设计并提高了整体效率。 2. **多输出电压选择**：支持1.1V到5V等多种输出电压，满足不同负载的需求。 3. **高效率**：在小体积内实现高效转换，节省空间并降低系统能耗。 4. **SIPP封装**：单列直插式封装，便于安装在电路板上，占用空间极小。 5. **垂直与水平安装兼容**：垂直和反向引脚封装设计，适应各种安装布局，尤其是竞争对手的保留区域。 6. **极少的外部组件需求**：通常不需要额外的外部元件，简化了系统构建。在简化电路图中，我们可以看到以下几个关键部分： - **输入**：+INPUT (7,8) 接口接收12V的输入电压。 - **公共端**：COMMON (6) 是电源的地线。 - **PWM控制器**：负责脉宽调制信号的产生，控制输出电压的稳定性。 - **电流感应及误差放大器**：通过电流感测参考和错误放大器来精确控制输出电流和电压。 - **VCC**：电源电压，为内部电路供电。 - **ON/OFF控制** (11)：允许外部控制电源的开启和关闭。 - **VOUT TRIM** (10)：提供输出电压微调的可能性。 - **+OUTPUT** (1,2,4)：提供1-5V的输出电压。 - **+SENSE** (3)：用于精确测量输出电流，确保准确的电流控制。 - **COMMON** (5)：与输入和输出地线连接。 LSN-3.3/10-D12-C模块电源是一款设计精良、高效、紧凑的电源转换模块，适用于需要高效能电源处理的嵌入式系统和分布式电源架构。它在通信、工业控制、医疗设备和其他需要紧凑、高效率电源解决方案的领域中具有广泛的应用。

MDC_LSN-10A D12_A02 Page 3 of 12

P O W E R E L E C T R O N I C S D I V I S I O N

D C / D C C O N V E R T E R S

www.cd4power.comwww.cd4power.com

LSN-10A D12 Models

Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages

Input

Input Voltage Range 10.8-13.2 Volts (12V nominal)

Input Current:

Normal Operating Conditions See Ordering Guide

Inrush Transient 0.08A

sec

Standby/Off Mode 8mA

Output Short-Circuit Condition ➁ 40mA average

Input Reﬂected Ripple Current

➁ 100mAp-p

Input Filter Type Capacitive (66

µF)

Overvoltage Protection None

Reverse-Polarity Protection None

Undervoltage Shutdown None

On/Off Control

➁ ➂ On = open (internal pull-down)

Off = +2.8V to +V

IN (<3mA)

Output

VOUT Accuracy (50% load) ±1.25% maximum

Minimum Loading

➀ No load

Maximum Capacitive Load 2000µF (low ESR, OSCON)

VOUT Trim Range ➁ ±10%

Ripple/Noise (20MHz BW) ➀ ➁ ➃ See Ordering Guide

Total Accuracy 3% over line/load/temperature

Efﬁciency

➁ See Ordering Guide

Overcurrent Detection and Short-Circuit Protection:

➁

Current-Limiting Detection Point 17 (13-23.5) Amps

Short-Circuit Detection Point 98% of V

OUT set

SC Protection Technique Hiccup with auto recovery

Short-Circuit Current 400mA average

Dynamic Characteristics

Transient Response (50% load step) 100µsec to ±2% of ﬁnal value

Start-Up Time:

➁

IN to VOUT and On/Off to VOUT 70msec for VOUT = 1V

16msec for V

OUT = 1.1V to 5V

Switching Frequency:

1V/1.1V, 1.2V, 1.3 Models 105/125kHz ±10%

1.5V/1.8V, 2V Models 160/177kHz ±10%

2.5V, 3.3V, 5V Models 200kHz ±7.5%

Environmental

Calculated MTBF ➄ 2.3-1.8 million hours (1VOUT to 5VOUT)

Operating Temperature:

(Ambient) ➁

Without Derating (Natural convection) –40 to +48/64°C (model dependent)

With Derating See Derating Curves

Thermal Shutdown +115°C

Physical

Dimensions See Mechanical Speciﬁcations

Pin Dimensions/Material 0.03" (0.76mm) round copper alloy with

tin plate over nickel underplate

Weight 0.3 ounces (8.5g)

Flamability Rating UL94V-0

Safety UL/cUL/IEC/EN 60950, CSA-C22.2 No. 234

Performance/Functional Speciﬁcations

Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀

➀ All models are tested/speciﬁed with external 22µF input/output capacitors.These caps

accommodate our test equipment and may not be required to achieve speciﬁed performance

in your applications. All models are stable and regulate within spec under no-load conditions.

➁ See Technical Notes and Performance Curves for details.

➂ The On/Off Control (pin 11) is designed to be driven with open-collector logic or the appli-

cation of appropriate voltages (referenced to Common, pins 5 and 6).

➃ Output noise may be further reduced with the installation of additional external output

ﬁltering. See I/O Filtering and Noise Reduction.

➄ MTBF’s are calculated using Telcordia SR-332(Bellcore), ground ﬁxed, TA = +25°C, full

power, natural convection, +67°C pcb temperature.

T E C H N I C A L N O T E S

Input Voltage:

Continuous or transient 15 Volts

On/Off Control

(Pin 11) +VIN

Input Reverse-Polarity Protection None

Output Overvoltage Protection

None

Output Current Current limited. Devices can

withstand sustained output short

circuits without damage.

Storage Temperature –40 to +125°C

Lead Temperature (soldering, 10 sec.) +300°C

These are stress ratings. Exposure of devices to any of these conditions may adversely

affect long-term reliability. Proper operation under conditions other than those listed in the

Performance/Functional Speciﬁcations Table is not implied.

Absolute Maximum Ratings

Return Current Paths

The LSN D12 SIP’s are non-isolated DC/DC converters. Their two Common

pins (pins 5 and 6) are connected to each other internally (see Figure 1). To

the extent possible (with the intent of minimizing ground loops), input return

current should be directed through pin 6 (also referred to as –Input or

Input Return), and output return current should be directed through pin 5

(also referred to as –Output or Output Return). Any on/off control signals

applied to pin 11 (On/Off Control) should be referenced to Common

(speciﬁcally pin 6).

I/O Filtering and Noise Reduction

All models in the LSN D12 Series are tested and speciﬁed with external

22µF tantalum input and output capacitors. These capacitors are necessary

to accommodate our test equipment and may not be required to achieve?

desired performance in your application. The LSN D12's are designed with

high-quality, high-performance internal I/O caps, and will operate within spec

in most applications with no additional external components.

In particular, the LSN D12's input capacitors are speciﬁed for low ESR

and are fully rated to handle the units' input ripple currents. Similarly, the

internal output capacitors are speciﬁed for low ESR and full-range frequency

response. As shown in the Performance Curves, removal of the external 22

µF

tantalum output caps has minimal effect on output noise.

In critical applications, input/output ripple/noise may be further reduced using

ﬁltering techniques, the simplest being the installation of external I/O caps.

External input capacitors serve primarily as energy-storage devices. They

minimize high-frequency variations in input voltage (usually caused by IR

drops in conductors leading to the DC/DC) as the switching converter draws

pulses of current. Input capacitors should be selected for bulk capacitance (at

appropriate frequencies), low ESR, and high rms-ripple-current ratings. The

switching nature of modern DC/DC's requires that the dc input voltage

source have low ac impedance at the frequencies of interest. Highly inductive

source impedances can greatly affect system stability. Your speciﬁc system

conﬁguration may necessitate additional considerations.

Output ripple/noise (also referred to as periodic and random deviations

or PARD) may be reduced below speciﬁed limits with the installation of

additional external output capacitors. Output capacitors function as true ﬁlter

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