The TS4431 is a four-terminal device dedicated to low voltage Switch Mode Power Supplies (SMPS). It integrates a 1.224V voltage reference, an amplifier, and an open collector output transistor in a single package. The TS4431’s operating mode is similar to the well-known standard voltage reference, the TL431. It maintains the desired feedback voltage at the REF pin in a closed loop configuration by sinking a current proportional to the error voltage at the REF pin. TS4431 features an open collector transistor with an ultra-low saturation voltage, allowing it to be used in series with the optocoupler in an SMPS architecture to regulate low voltage SMPS.
The TS4431 is a four-terminal device dedicated to low voltage Switch Mode Power Supplies (SMPS). It integrates a 1.224V voltage reference, an amplifier, and an open collector output transistor in a single SOT23-5L package. The device operates similarly to the TL431 standard voltage reference, maintaining a desired feedback voltage at the REF pin in a closed loop configuration by sinking a current proportional to the error voltage.
| Reference voltage (Typical) | 1.224 V |
|---|---|
| Accuracy | 0.5% or 1% |
| Operating temperature range | -40 to +85 °C |
| Temperature coefficient | 100 ppm/°C |
| Output sink current (Max) | 30 mA |
| Supply voltage (Operating) | 1.5 to 10 V |
| Output saturation voltage (Max) | 120 mV |
| Supply current (Typical) | 250 µA |
The typical reference voltage is 1.224V.
The device operates in an industrial temperature range from -40 to +85°C.
The maximum output sink current is 30 mA.
The typical supply current consumption is 250 µA.