Overview
The TSM1052 is a highly integrated solution from STMicroelectronics designed for Switch-Mode Power Supply (SMPS) applications that require dual control loops for constant voltage (CV) and constant current (CC) regulation. This component is particularly suited for space-constrained applications such as adapters and chargers due to its compact SOT23-6 package.
The TSM1052 integrates a voltage reference, two operational amplifiers with OR-ed open-drain outputs, and a low-side current sensing circuit. The voltage reference and one operational amplifier form the core of the voltage control loop, while the current sensing circuit and the other operational amplifier constitute the current control loop.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Part Number | TSM1052 | |
| Package | SOT23-6 | |
| Marketing Status | Active | |
| DC Supply Voltage (VCC) | 1.7 to 20 | V |
| Quiescent Current (ICC) | 150 µA (typical) | µA |
| Open-Drain Voltage (VOUT) | -0.3 to VCC | V |
| Max Sink Current (IOUT) | 100 mA | mA |
| Junction Temperature Operating Range | -10 to 85 °C | °C |
| Maximum Junction Temperature | 150 °C | °C |
| Thermal Resistance, Junction-to-Ambient | 250 °C/W | °C/W |
Key Features
- Secondary-side constant voltage and constant current control
- Very low voltage operation
- Very low quiescent consumption
- High-accuracy internal reference (1.21 V bandgap reference)
- Low external component count
- Wired-or open-drain output stage
- Easy frequency compensation
- Compact SOT23-6 micro package
Applications
- Battery chargers
- AC-DC adapters
- Other space-constrained SMPS applications requiring dual control loops
The TSM1052 is particularly useful in applications where precise control over both voltage and current is necessary, such as in charging circuits and power adapters.
Q & A
- What is the primary function of the TSM1052?
The TSM1052 is a constant voltage and constant current controller designed for SMPS applications.
- What package type is the TSM1052 available in?
The TSM1052 is available in a SOT23-6 package.
- What are the key components integrated into the TSM1052?
The TSM1052 integrates a voltage reference, two operational amplifiers, and a low-side current sensing circuit.
- What is the operating voltage range of the TSM1052?
The operating voltage range is from 1.7 V to 20 V.
- What is the typical quiescent current of the TSM1052?
The typical quiescent current is 150 µA.
- What are the main applications of the TSM1052?
The main applications include battery chargers and AC-DC adapters.
- How does the TSM1052 control voltage and current?
The TSM1052 uses two transconductance operational amplifiers, one for voltage control and one for current control, along with external components like resistors and an optocoupler.
- What is the significance of the internal voltage reference in the TSM1052?
The internal voltage reference is set at 1.21 V and is crucial for the precision of the voltage control loop.
- What are the thermal specifications of the TSM1052?
The junction temperature operating range is -10 to 85 °C, and the maximum junction temperature is 150 °C.
- How does the TSM1052 ensure low external component count?
The TSM1052 is designed to require minimal external components, such as a resistor divider, sense resistor, and frequency compensation components, to complete the control loops.
