Delta DC24S1215 DC-DC Power Module In-Depth Analysis

A Delta-manufactured DC-DC power module, model DC24S1215, was recently obtained. This module is a miniature isolated 15W DC/DC converter with 1500VDC isolation capability. It features an ultra-wide 4:1 input voltage range of 18V~75V and can deliver an output of 12V/1.3A. Notably, it is compatible with various power ecosystems, including 30W chargers, USB-C chargers, and wall chargers, making it versatile for integration into different device setups. The operating temperature range of this module is from -40°C to +85°C, suitable for industrial control, transportation, communications, test instruments, medical equipment, and various applications with strict PCB space requirements. Below is a detailed introduction to this power module, which also serves as a complementary component for many 30W chargers, USB-C chargers, and wall chargers in complex power systems.

I. Overview of Delta DC-DC Power Module

The front of the module features a neat component layout. The upper terminals serve as the input area, and the lower terminals as the output area. The isolation transformer is marked with input and output specifications: input 18-75V 1.1A and output 12V 1.3A. This design ensures easy integration with common power sources such as 30W chargers, USB-C chargers, and wall chargers, facilitating quick deployment in various projects.

The back is equipped with control ICs and power devices. The isolation transformer is printed with the model number DC24S1215 and S/N code: 185248146 S0. When paired with 30W chargers, USB-C chargers, or wall chargers, this module maintains stable performance due to its robust structural design and high-quality components.

The overall length of this power module is 2.80cm, width 2.43cm, and thickness 0.74cm, with a weight of only 9.4g. Its compact size makes it an ideal auxiliary power solution for small-sized 30W chargers, USB-C chargers, and wall chargers, where space is at a premium.

The overall volume of the module is smaller than that of the POWER-Z KM003C test instrument. This miniaturized design allows it to be easily embedded into the internal structures of 30W chargers, USB-C chargers, and wall chargers without occupying excessive space.

II. Scheme Analysis of Delta DC-DC Power Module

After a brief overview of the appearance of Delta's power module, let's conduct an in-depth analysis of its component distribution. This module is often used in conjunction with 30W chargers, USB-C chargers, and wall chargers to enhance power conversion efficiency and stability in diverse applications.

1. Analysis of Front Component Layout

Starting with the front of the product, the key components are as follows, many of which are selected to match the working parameters of 30W chargers, USB-C chargers, and wall chargers:

A PWM controller from Texas Instruments (TI) with the actual model UCC28C40. It is a 20V, 1A, low-power 1MHz current-mode PWM controller with 7V/6.6V UVLO and 100% duty cycle. This controller ensures smooth coordination between the module and 30W chargers, USB-C chargers, or wall chargers, optimizing power transfer efficiency.

Chips marked with "RAHRJH" are precision low-voltage shunt regulators from onsemi, with actual models TLV431BSNT1G and TLV431ASNT1G. These regulators play a crucial role in stabilizing the output voltage when the module is connected to different power sources like 30W chargers, USB-C chargers, and wall chargers.

A 90mA ultra-low quiescent current CMOS LDO regulator from Torex, model LD6991/A. It provides stable low-voltage power supply for the module's control circuit, ensuring reliable operation even when paired with high-frequency 30W chargers, USB-C chargers, or wall chargers.

An optocoupler from Everlight, model EL3H7, used for isolation between input and output terminals. This isolation feature enhances the safety and anti-interference ability of the module when integrated with 30W chargers, USB-C chargers, and wall chargers in complex electrical environments.

An isolation transformer marked with input and output voltage and current parameters. It is designed to be compatible with the voltage ranges of most 30W chargers, USB-C chargers, and wall chargers, expanding the module's application scope.

An operational amplifier chip marked with "2904", with the actual model LM2904 from onsemi. It assists in signal processing and monitoring, ensuring that the module operates stably when connected to 30W chargers, USB-C chargers, or wall chargers.

2. Analysis of Back Component Layout

Moving on to the back of the module, the components are mainly responsible for protection, power conversion, and logic control, all of which are optimized to work with 30W chargers, USB-C chargers, and wall chargers:

A TVS diode from Littelfuse, which provides overvoltage protection for the module and the connected 30W chargers, USB-C chargers, or wall chargers, preventing damage from voltage surges.

A chip marked with "7820", which functions as an auxiliary voltage regulator to ensure stable power supply for key components, especially when the module is powered by 30W chargers, USB-C chargers, or wall chargers with fluctuating input voltages.

An inductor and multiple MLCC filter capacitors, along with a 0.15Ω resistor. These components form a filtering circuit that reduces electromagnetic interference (EMI), ensuring that the module does not affect the performance of nearby 30W chargers, USB-C chargers, or wall chargers.

An 8-bit microcontroller from Microchip, model PIC12F675. It integrates a 4-channel 10-bit ADC, 1 comparator, and 128-byte EEPROM data memory. This microcontroller enables flexible parameter adjustment, making the module adaptable to different 30W chargers, USB-C chargers, and wall chargers, and suitable for automotive electronics, industrial control, home appliances, and entry-level consumer products that require on-site reprogramming.

The back of the isolation transformer is printed with the module model and identification information, which is convenient for quality control and after-sales service, especially when the module is used as a spare part for 30W chargers, USB-C chargers, and wall chargers.

A Schottky diode from STMicroelectronics, model STPS5H100B, packaged in DPAK with specifications of 100V 5A. It is responsible for rectification on the output side, ensuring efficient power conversion when the module is paired with 30W chargers, USB-C chargers, or wall chargers.

Three MLCC filter capacitors are located at the bottom left corner, further enhancing the filtering effect and ensuring stable power output for the connected 30W chargers, USB-C chargers, or wall chargers.

III. Summary

Delta DC24S1215 is a miniature isolated DC-DC power module with a compact and lightweight design (2.80×2.43×0.74cm, 9.4g), making it very suitable for application scenarios with strict requirements on PCB space and system reliability. It is widely used as an auxiliary power component for 30W chargers, USB-C chargers, and wall chargers, improving the overall performance and stability of power systems.

In terms of the component scheme, the front uses TI's UCC28C40 current-mode PWM controller for main control and driving, combined with Everlight's EL3H7 optocoupler to complete input/output isolation feedback, supplemented by voltage detection, operational amplifier, and LDO to improve the power supply and monitoring links. The back focuses on protection and power conversion: TVS diodes, voltage regulators, filter inductors, and multiple MLCCs form input-side protection and filtering; the output side uses ST's STPS5H100B Schottky diode for rectification, and the PIC12F675 microcontroller is added to achieve parameter sampling and logic management. This design further enhances the module's adaptability and controllability when integrated with 30W chargers, USB-C chargers, and wall chargers, making it a mature industrial-grade power supply solution that balances reliability, compatibility, and miniaturization. Whether used independently or paired with 30W chargers, USB-C chargers, or wall chargers, it can meet the strict power supply requirements of various high-end fields.