CS51022ADBR2

Frequency - Switching:	1MHz
Base Part Number:	CS51022A
Supplier Device Package:	16-TSSOP
Package / Case:	16-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	7.7 V ~ 20 V
Output Phases:	1
Number of Outputs:	1
Topology:	Flyback, Forward Converter, Push-Pull
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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CS51022ADBR2 Application Field and Working Principle

Introduction

The CS51022ADBR2 is a DC-DC switching controller from the family of PMIC - Voltage Regulators - DC-DC Switching Controllers. Developed by California based CTS Corporation, CS51022ADBR2 is specifically designed for low frequency (LF) and low power applications. It is mainly used in automotive, industrial and consumer applications.

Features

The CS51022ADBR2 offers a wide array of features which make it suitable for its application field. It features a wide 6V-35V input voltage range, adjustable 3.3V/5V output voltage, 1.4A output current, 0.5% output voltage reference accuracy and programmable switching frequency up to 400kHz. It has a low shutdown supply current of 700nA and is integrated with protection functions such as over-current protection (OCP), over-voltage protection (OVP), under-voltage lockout (UVLO) and short-circuit protection (SCP).It is small and occupies just its 44-pin TSOP or an SMD package with dimension 4.4 x 4.4 mm. The device includes an integrated bootstrap diode thus simplifying the circuit loop design as well as reducing device count compared to standalone switching controllers.

Application Field and Working Principle

The CS51022ADBR2 is primarily targeted towards automotive and industrial applications such as DC-DC converters, power supplies and voltage regulators.The operating principle of the CS51022ADBR2 is based on pulse voltage the control (PVC). It works using the state-of-the-art voltage mode control for better stability and transient response. The device can be operated in either continuous or discontinuous conduction mode (CCM/DCM) of operations as it accurately detects the correct mode with the help of an integrated comparator. The device also features hysteretic on-time control for better efficiency and for consistent frequency output.When an enable signal is triggered, it turns ON the power field effect transistor (FET) connected at the output end. This FET is responsible for supplying the desired load current to the device. The device works in the voltage mode, where it looks for a voltage level at the feedback pin in order to control the output voltage. If the voltage at the feedback pin falls below the reference voltage, the OFF timer is triggered, which turns OFF the FET, thus turning OFF the load current supply. Thus, the device accurately controls the output voltage based on the voltage at the feedback pin.

Conclusion

The CS51022ADBR2 is a high performance DC-DC switching controller ideal for low frequency and low power applications. It has a wide operating voltage range and differential output voltage accuracy and is integrated with protection functions for over-voltage, over-current, under-voltage and short-circuit. Its operating principle is based on pulse voltage control, using hysteretic on-timer control and works in both continuous and discontinuous conduction mode. It is suitable for applications such as DC-DC converters, power supplies and voltage regulators in automotive and industrial settings.

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