DD1718PA 5V Positive & Negative Dual Output Power Supply

DD1718PA 5V Positive & Negative Dual Output Power Supply Module is an essential switching regulator designed to generate clean, isolated, dual-rail positive and negative 5V DC power from a single wider voltage input. This compact DC-DC converter efficiently produces the symmetric power rails required by sensitive analog circuitry, such as operational amplifiers, instrumentation amplifiers, and high-precision data converters. The DD1718PA eliminates the complexity of generating a virtual ground reference or using two separate isolated supplies. Therefore, engineers utilize this module to quickly implement bi-polar power supplies in portable or space-constrained systems where minimizing power loss is critical. Furthermore, its high switching frequency ensures minimal output ripple, providing the stable power platform necessary for achieving high signal integrity.

Key Features:

• Dual Output Voltage: Provides both +5V and −5V symmetric output rails from a single input source, simplifying power distribution for analog circuits.
• High Efficiency: Operates as a switching regulator, achieving significantly higher efficiency than traditional linear regulators, especially with higher input voltages.
• Wide Input Range: Accepts a broad DC input voltage range, typically spanning 3.6 V to 30 V, offering flexibility across various battery and system supply lines.
• Output Isolation: Provides an isolated ground path (relative to the input ground) for the dual output, crucial for reducing noise coupling in sensitive applications.
• Compact Size: The module’s small PCB footprint makes it ideal for integrating bi-polar power into portable devices and densely packed circuit boards.

Technical Specifications:

• Input Voltage (V_IN): 3.6 V to 30 V DC
• Output Voltage (V_OUT): +5 V and −5 V DC (±3%)
• Output Current (I_OUT): Maximum 50 mA (for both rails combined, load dependent)
• Switching Frequency: ≈ 400 kHz to 1.2 MHz (High frequency minimizes component size)
• Conversion Efficiency: Up to 85% (Dependent on V_IN and load)
• Quiescent Current: ≈ 10 mA (Low standby power draw)

Mechanical Specifications:

• Component Type: DC-DC Switching Regulator Module
• Mounting: Solder pads/Pin headers for direct PCB integration or breadboard use.
• Heat Dissipation: Designed for low power, typically requiring no external heatsink under standard load conditions.
• Construction: High-quality FR4 PCB material with surface mount components.

Dimensions:

• Module Length: ≈ 28 mm
• Module Width: ≈ 17 mm
• Module Height: ≈ 6 mm (Including capacitors)
• Pin Pitch: 2.54 mm (0.1 inch)

Pinout and Wiring:

• VIN: Connect to the positive input DC power source (3.6 V to 30 V).
• GND (Input): Connect to the ground reference of the input power source.
• GND (Output): This is the common ground/virtual zero point for the +5V and −5V outputs. This output ground is isolated from the input ground.
• +5V: The positive output voltage rail (+5 V DC).
• −5V: The negative output voltage rail (−5 V DC).
• Wiring Note: Ensure the input voltage stays within the specified range to prevent damage. Always place decoupling capacitors close to the load circuit.

Datasheet Reference:

• Download DD1718PA Dual Output Power Supply Datasheet

Commonly Used in:

• Analog Signal Processing: Powering Op-Amps, analog multiplexers, and comparators that require dual supply voltages.
• Audio Equipment: Providing clean, symmetric power for pre-amplifiers and small audio mixer circuits to achieve rail-to-rail performance.
• Portable Instrumentation: Used in handheld multimeters, oscilloscopes, and battery-powered data logging systems.

Applications:

• Voltage Biasing: Creating precise positive and negative reference voltages for complex sensing systems.
• Differential Amplifiers: Supplying balanced power to differential input stages to maximize common-mode rejection ratio (CMRR).
• Lab Bench Supplies: Used as a sub-module to quickly generate a ±5V rail for prototyping and testing low-current analog circuits.

Equivalent Models:

• Recom R-78 series (used with external charge pump): While not a direct module equivalent, specialized switching regulators often require external circuitry to achieve true dual output.
• LT1054 / ICL7660 (Charge Pump ICs): These ICs can generate negative voltage from a positive input, however, they offer lower current capacity and generally produce more ripple than a dedicated switching module like the DD1718PA.

Package Includes:

• 1 x DD1718PA 5V Positive & Negative Dual Output Power Supply Module