TL3844P

Series:	--
Packaging:	Tube
Part Status:	Active
Output Type:	Transistor Driver
Function:	Step-Up, Step-Up/Step-Down
Output Configuration:	Positive
Topology:	Boost, Flyback, Forward
Number of Outputs:	1
Output Phases:	1
Voltage - Supply (Vcc/Vdd):	10 V ~ 30 V
Frequency - Switching:	Up to 500kHz
Duty Cycle (Max):	48%
Synchronous Rectifier:	No
Clock Sync:	No
Serial Interfaces:	--
Control Features:	Frequency Control
Operating Temperature:	0°C ~ 70°C (TA)
Package / Case:	8-DIP (0.300", 7.62mm)
Supplier Device Package:	8-PDIP
Base Part Number:	TL3844

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PMIC - Voltage Regulators - DC DC Switching Controllers

The TL3844P is a high-efficiency PWM control and switching regulator power management integrated circuit (PMIC) used for various types of applications. Its operating frequency and power rating depend on the application. It typically operates at 200kHz to 500kHz and typically has a power capability up to 30W.

Overview

The TL3844P is a high-speed synchronous MOSFET driver that operates as a voltage regulator, providing efficient power efficiency in a wide range of switching power supplies. It features a wide operating range, low start-up current, reduced thermal stress and temperature-compensating error amplifier to maximize efficiency. This high-capacity power MOSFET driver supports up to 30A peak output current and up to 500kHz operation, making it ideal for higher-end applications such as industrial, automotive, and medical systems.

Applications

The TL3844P has a wide variety of applications in different power management fields. It can be used for high-frequency buck, boost, buck-boost, and inverting DC–DC converters, flyback and bridged topologies, SMPS dynamotor, cold cathode fluorescent lamp (CCFL) inverter, class D audio amplifier, LED driver and LED dimming, battery charging, low noise supplies, fault protection and monitoring, PFC controllers, and more.

Structure

The TL3844P consists of two main functional blocks: the high-side gate driver and the low-side gate driver. The high-side gate driver is tasked with supplying gate drive pulses that turn on the high-side MOSFET of a synchronous MOSFET pair. Meanwhile, the low-side gate driver is responsible for the synchronized gate drive pulses. The timing is controlled by both an internal oscillator module and by an external clock signal. The high-side and low-side drivers are connected to two independent error amplifiers which use a transconductance output stage. The error amplifiers increase their output when their primary input pins (INH and INV) are low. The transconductance stage also includes an offset comparator to activate the protection circuit during an over-voltage event.

Working Principle

The TL3844P is used in a variety of switching power supply topologies. Generally speaking, when a synchronous pair of MOSFETs is used, it works by the high-side gate driver providing sufficient gate drive pulses for the high-side MOSFET, and the low-side gate driver providing synchronized gate drive pulses for the low-side MOSFET. This is done with the help of two independent error amplifiers. The two error amplifiers measure the differential between their primary input pins (INH and INV) and their reference (REF). The error amplifiers then increase their output when the measured differential value is low. The increase in the output of the error amplifiers causes an increase in the gate drive of the respective MOSFETs. With both MOSFETs driven, the output voltage is regulated by the signal from the REF voltage in a feedback loop configuration. When the signal from the REF voltage is too low, the output voltage increases until the signal from the REF voltage is within the preset range. When the output voltage reaches the maximum preset range, the feedback loop reduces the signal to the MOSFETs, causing them to turn off.

Protection Circuitry

The TL3844P has a number of protection features to help ensure optimum performance in various applications. These protection features include over-current protection, over-voltage protection, and under-voltage lockout (UVLO). The over-voltage protection circuitry is triggered by an offset comparator which turns off the MOSFETs in the event of an over-voltage event. The UVLO circuit protects the power device when the supply voltage is too low. Additionally, the over-current protection circuitry can be used to reduce stress on the MOSFETs in the event of overload or short-circuit conditions.

Conclusion

The TL3844P is an efficient PWM control and switching regulator integrated circuit that is widely used in various types of power management applications. Its wide operating range and low start-up current make it suitable for industrial, automotive, and medical power management applications. It features an advanced protection circuit to ensure optimal performance in a variety of situations. Its two independent error amplifiers provide sufficient gate drive pulses for a synchronous pair of MOSFETs, allowing for a stable output voltage to be regulated by a feedback loop configuration.

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