TL5001IPSR Datasheet/PDFTL5001IPSR Application Field and Working Principle
The TL5001IPSR is a synchronous buck switching controller from Texas Instruments (TI). It can be classified under PMIC - Voltage Regulators - DC DC Switching Controllers and is used for making a synchronous buck converter.
Synchronous buck converters are efficient step down power converters in which the output voltage is regulated by controlling the on-time of the output switch, in contrast to conventional buck converters that control the output voltage by controlling the switching frequency. This makes synchronous buck converters suitable for designing systems with high-current applications. Furthermore, they provide better utilization of components than their conventional counterparts.
The TL5001IPSR is designed as a wide input voltage range and very low noise - 1.7V to 18V, 120mV in lock regulation and 95dB PSRR. Also, it has fast-transient response and excellent line-load regulation.
The device interfaces with high-side and low-side MOSFET drivers, such as the DRV8301-Q1 MOSFET drivers from TI. The device also has minimum drain source on-resistor (< 1 Ω) and low gate drive power (<150 mA). Also, peak current mode control is used to generate a clean and non-overlapping switching waveform driver.
TL5001IPSR Working Principle
The TL5001IPSR uses an external N-channel MOSFET as the main power switch. The other components of the device such as inductor, capacitor, and Schottky diode form the rest of the synchronous buck converter and the device acts as the controller.
The device has two control loops - the voltage loop and the current loop. The error amplifier compares the output voltage to the reference voltage and then drives the PWM comparator. The PWM comparator compares the voltage error signal with the current-sense signal and then offers the on/off control signal to the external main power MOSFET. The device makes use of heavy-duty PWM dimming to reduce the output current ripple.
The TL5001IPSR also has three protection features - Temperature Protection, Over Current Protection (OCP), and Under Voltage Lock Protection (UVLO). Temperature protection helps to protect the IC from any over-temperature condition. OCP protects the system against any current overload issues by disabling the output switch. UVLO helps in detecting the input voltage condition and protect the device from any low-voltage condition.
Conclusion
The TL5001IPSR is a synchronous buck switching controller developed by Texas Instruments. It is used for making a synchronous buck converter and provides wide input voltage range and very low noise - 1.7V to 18V, 120mV in lock regulation and 95dB PSRR. It also has fast-transient response and excellent line-load regulation. The device has two control loops - the voltage loop and the current loop and also has three protection features - Temperature Protection, Over Current Protection (OCP), and Under Voltage Lock Protection (UVLO).