NCP785AH120T1G Integrated Circuits (ICs)

Voltage Dropout (Max):	--
Supplier Device Package:	SOT-89-3
Package / Case:	TO-243AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	70dB (1kHz)
Current - Quiescent (Iq):	22µA
Current - Output:	10mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	450V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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NCP785AH120T1G Application Field and Working Principle

Introduction

NCP785AH120T1G is a linear voltage regulator from ON Semiconductor. It is suitable for use in diverse applications where a low-voltage system requires adjustable output regulation. The adjustable output voltage ranges from 1.25 V to 34 V, and the output current can reach up to 1 A. Furthermore, the device supports a wide operating temperature range, with a minimum junction temperature of -40°C and a maximum junction temperature of +140 °C.

Features of the NCP785AH120T1G

The NCP785AH120T1G has some features which distinguish it from other linear voltage regulators:

• A wide adjustable output voltage range from 1.25 V to 34 V.
• An input voltage range from 3.3 V to 40 V.
• A maximum output current of 1 A.
• High current surge capability of up to 2 A.
• Low output voltage ripple.
• Low total harmonic distortion.
• Reverse current protection.
• Over voltage protection.
• Temperature protection.

Applications of the NCP785AH120T1G

The NCP785AH120T1G is an ideal device for a wide range of applications that require adjustable output voltage regulation including:

• Automotive systems.
• Industrial systems.
• Consumer electronics.
• Computer and networking equipment.
• Battery powered systems.
• Solar panel systems.

Working Principle of the NCP785AH120T1G

The NCP785AH120T1G is a linear voltage regulator, which is based on the concept of voltage-divider feedback. This type of regulator uses an internal feedback network to precisely control the output voltage. The device has two key parts, a voltage reference and an error amplifier. The voltage reference part generates a precisely regulated voltage, which is compared against a reference voltage. The error amplifier part will then compare these two voltages and, if there’s any difference, will adjust the voltage across the feedback resistor to compensate and balance the voltages. The feedback resistor is placed between the output terminal and the error amplifier, changing the output voltage according to the output current. This is done by the error amplifier modulating the output voltage in order to match the reference voltage, which ensures that the output voltage remains at the correct level. The controlled output is monitored by the internal compensation network, which is used to prevent the output voltage from exceeding its allowed value as a result of a sudden increase in load current. This aim of this is to prevent any damage to the system.

Conclusion

The NCP785AH120T1G linear voltage regulator is a versatile device that can be used in a variety of applications. It has a wide adjustable output voltage range, an input voltage range of 3.3 V to 40 V, and a maximum output current of 1 A. It features low output voltage ripple, reverse current protection, over voltage protection and temperature protection. Furthermore, it has a wide operating temperature range of -40°C to +140 °C.

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