The **SPR01L-09** is a high-efficiency, isolated DC-DC converter manufactured by **MEAN WELL**. It belongs to the SPR01 series, designed for industrial and telecommunications applications where a regulated output is required from a fluctuating input voltage. --- ## 1. Technical Specifications The following table summarizes the core electronic characteristics of the SPR01L-09: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 18V ~ 36V DC (24V Nominal) | | **Output Voltage** | 9V DC | | **Output Current** | 111 mA (Max) | | **Rated Power** | 1 Watt | | **Isolation Voltage** | 1500V DC (Input to Output) | | **Efficiency** | ~80% | | **Package Type** | SIP 7 (Single In-line Package) | --- ## 2. Key Internal Components & Features The SPR01L-09 consists of several critical electronic sub-sections integrated into its small footprint: ### A. Regulation Circuitry Unlike unregulated converters where output voltage drops as the load increases, the SPR01L-09 is **regulated**. It uses an internal feedback loop to maintain a steady 9V output even if the input fluctuates between 18V and 36V. ### B. Isolation Barrier It features a high-frequency transformer that provides galvanic isolation of **1500V DC**. This protects sensitive downstream components from high-voltage surges or ground loops occurring on the input side. ### C. Protection Mechanisms * **Short Circuit Protection:** It includes continuous short-circuit protection with automatic recovery (hiccup mode). * **Overload Protection:** Prevents the device from overheating if the current draw exceeds 111mA. --- ## 3. Pin Configuration (SIP 7) The device uses a standard 7-pin layout (though some pins may be omitted/not connected): | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | +Vin | Positive Input Voltage | | 2 | -Vin | Negative Input (GND) | | 4 | +Vout | Positive Output Voltage | | 6 | -Vout | Negative Output (GND) | --- ## 4. Typical Applications * **Data Communication:** Providing clean power to RS-232 or RS-485 transceivers. * **Industrial Control:** Isolating analog sensors from noisy digital power rails. * **Distributed Power Architecture:** Converting a 24V bus down to a localized 9V rail for specific ICs.