PT79SR108H

Voltage - Output 3:	--
Base Part Number:	PT79SR108
Size / Dimension:	0.94" L x 0.90" W x 0.31" H (23.9mm x 22.9mm x 7.9mm)
Package / Case:	3-SIP Module
Mounting Type:	Through Hole, Right Angle
Efficiency:	85%
Operating Temperature:	-40°C ~ 85°C
Features:	OTP, SCP
Applications:	ITE (Commercial)
Current - Output (Max):	1.5A
Series:	PT79SR100
Voltage - Output 2:	--
Voltage - Output 1:	-8V
Voltage - Input (Max):	-30V
Voltage - Input (Min):	-12V
Number of Outputs:	1
Type:	Non-Isolated PoL Module
Part Status:	Obsolete
Packaging:	Tray

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This article is about the application field and working principle of PT79SR108H, a type of DC-DC converters.PT79SR108H is a kind of low-voltage full-bridge integrated-circuit DC-DC converter from Ricoh Electronic Components. It is rated at 0.75A at an output voltage of 0.8V to 3.6V.The application field of this DC-DC converter includes digital home appliances, battery standby power supply, cell phone charging, mobile communication and other system with a supply voltage range of 6.0-36volt. It integrates a high-performance PWM controller with a low-voltage full-bridge power MOSFET. And this low-voltage full-bridge enables it to operate in a higher frequency range from 200kHz to 2MHz, making sure a higher power density.The working principle of PT79SR108H can be described as follows. Firstly, current is supplied to the input terminal through a smoothing capacitor and a rectifier. The current input drives a high-performance PWM controller. This PWM controller is responsible for controlling a pair of on/off transistors—low-voltage full-bridge power MOSFETs. This allows the output current to be switched from one cyclic period to another, thus making the voltage constant.In a nutshell, PT79SR108H is a type of DC-DC converters with superior power density yet low cost.Rated at 0.75A at an output voltage of 0.8V to 3.6V, it is suitable for a wide range of applications such as digital home appliances, battery standby power supply, cell phone charging, mobile communication and other systems with a supply voltage range of 6.0-36volt. Its working principle can be described as the use of a high-performance PWM controller to switch the output current by controlling a pair of on/off transistors.

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