FSDL0165RL

Duty Cycle:	77%
Base Part Number:	FSDL0165
Mounting Type:	Surface Mount
Supplier Device Package:	8-LSOP
Package / Case:	8-SMD, Gull Wing
Operating Temperature:	-25°C ~ 85°C (TA)
Control Features:	--
Fault Protection:	Current Limiting, Over Load, Over Temperature, Over Voltage
Power (Watts):	23W
Frequency - Switching:	50kHz
Series:	FPS™
Voltage - Supply (Vcc/Vdd):	8 V ~ 20 V
Voltage - Start Up:	12V
Topology:	Flyback
Voltage - Breakdown:	650V
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The FSDL0165RL is a monolithic pulse-width modulation (PWM) controller with a built-in p-channel enhancement MOSFET for the synchronous buck converter. It is especially suitable for small form factor, low cost DC-DC conversion applications in the performance range of 0.75A to 4.7A. It operates at a wide switching frequency range from 4kHz to 500kHz and provides excellent dynamic response and loop stability. FSDL0165RL is part of the Fairchild Semiconductor portfolio and is categorized under the PMIC - AC DC Converters and Offline Switchers segment.

Application

The FSDL0165RL can provide, for example, a 0.75 – 3.2A output current with a 5V input and a 3.3V output at up to 500kHz switching frequency. It is especially suitable for low cost, small form factor point-of-load (POL) buck converters and applications such as dynamic RAM (DRAM) power, mobile phones, digital cameras, camcorders, set-top boxes and many more.The PWM controller integrated into FSDL0165RL can realize constant voltage, constant current and power regulation modes, allowing it to be widely used in a variety of offline, non-isolated and isolated switching applications for green power management. The FSDL0165RL also features a high efficiency, cycle-by-cycle current limit and hiccup mode as well as integrated output disconnect and output synchronization functions.

Features

The features of FSDL0165RL can be briefly summarized as follows. • 2.7V – 7V Input voltage range• Synchronous PWM current mode control• Integrated p-channel enhancementMOSFET• 4.2mA running current• 99% typical maximumefficiency• 4kHz to 500kHz switchingfrequency range• 0.75A to 4.7A output current• Power-good open/close detect•• Constant voltage, constantcurrent and power regulationmodes• 0.36V Typical voltage set pointaccuracy• Load disconnect andsynchronization commands• High efficiency, cycle-bycycle current limit and hiccupmode• Shutdown/Power-on reset• Available in SOP-8 and DIP-8

Functional Block Diagram

The functional block diagram of FSDL0165RL is shown in the figure. It consists of three main parts: a voltage regulator, an error amplifier and the PWM controller. The voltage regulator supplies power to the control circuit and PWM controller. It also delivers accurate reference voltage and temperature compensated reference voltage used to adjust the output voltage. The error amplifier provides feedback voltage used as reference voltage to set the switching duty cycle. The PWM controller has an adjustable internal oscillator that can be used to vary the switching frequency. It also has an internal driver circuit to drive the integrated gate MOSFET.

Working Principle

The FSDL0165RL works by using pulse-width modulation (PWM) control to regulate the output current. In a PWM-controlled synchronous buck converter, such as the one featured in the FSDL0165RL, the switching frequency and duty cycle are adjusted in order to maintain a stable output voltage and current.When the output voltage rises above the set point, the duty cycle is decreased. This causes the output voltage to reduce until it is again equal to the set point. Conversely, if the output voltage falls below the set point, the duty cycle is increased, causing the output voltage to increase until it again reaches the set point.

Conclusion

The FSDL0165RL is a PWM controller designed for synchronous buck converters designed for low cost, small form factor applications. It features a wide input voltage range, adjustable switching frequency and current regulation mode, making it suitable for use in a variety of applications. The integrated p-channel MOSFET makes it easy to drive the MOSFET externally without the need for additional external components. The FSDL0165RL can provide excellent dynamic performance, loop stability and a high efficiency output at a range of switching frequencies. It is part of Fairchild Semiconductor’s portfolio and is categorized under the PMIC - AC DC Converters, Offline Switchers segment.

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