UC3856Q

Obsolete

Texas Instruments

IC REG CTRLR MULT TOP 20PLCC

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DocumentsDatasheet

UC3856Q

Obsolete

Texas Instruments

IC REG CTRLR MULT TOP 20PLCC

Deep-Dive with AI

DocumentsDatasheet

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	UC3856Q

Clock Sync	True
Control Features	Frequency Control, Enable, Soft Start
Duty Cycle (Max) [Max]	47 %
Frequency - Switching	200 kHz
Function	Step-Up, Step-Up/Step-Down, Step-Down
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output Configuration	Positive
Output Phases	1
Output Type	Transistor Driver
Package / Case	20-LCC (J-Lead)
Supplier Device Package	20-PLCC (9x9)
Synchronous Rectifier	True
Topology	Forward Converter, Flyback, Push-Pull, Half-Bridge, Full-Bridge, Boost, Buck
Voltage - Supply (Vcc/Vdd) [Max]	40 V
Voltage - Supply (Vcc/Vdd) [Min]	7 V

UC3856 Series

40V, 1.5A current mode 1MHz PWM controller , 0C to 70C

Part	Control Features	Supplier Device Package	Output Phases	Package / Case	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Duty Cycle (Max) [Max]	Operating Temperature [Max]	Frequency - Switching	Output Configuration	Output Type	Mounting Type	Topology	Number of Outputs	Function	Package / Case	Package / Case
Texas Instruments UC3856Q	Enable Frequency Control Soft Start	20-PLCC (9x9)	1	20-LCC (J-Lead)	7 V	40 V	47 %	70 °C	200 kHz	Positive	Transistor Driver	Surface Mount	Boost Buck Flyback Forward Converter Full-Bridge Half-Bridge Push-Pull	2	Step-Down Step-Up Step-Up/Step-Down
Texas Instruments UC3856NG4	Enable Frequency Control Soft Start	16-PDIP	1	16-DIP	7 V	40 V	47 %	70 °C	200 kHz	Positive	Transistor Driver	Through Hole	Boost Buck Flyback Forward Converter Full-Bridge Half-Bridge Push-Pull	2	Step-Down Step-Up Step-Up/Step-Down	0.3 in	7.62 mm
Texas Instruments UC3856N	Enable Frequency Control Soft Start	16-PDIP	1	16-DIP	7 V	40 V	47 %	70 °C	200 kHz	Positive	Transistor Driver	Through Hole	Boost Buck Flyback Forward Converter Full-Bridge Half-Bridge Push-Pull	2	Step-Down Step-Up Step-Up/Step-Down	0.3 in	7.62 mm
Texas Instruments UC3856QG3	Enable Frequency Control Soft Start	20-PLCC (9x9)	1	20-LCC (J-Lead)	7 V	40 V	47 %	70 °C	200 kHz	Positive	Transistor Driver	Surface Mount	Boost Buck Flyback Forward Converter Full-Bridge Half-Bridge Push-Pull	2	Step-Down Step-Up Step-Up/Step-Down

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 6.24
		10	$ 5.63
		46	$ 5.37
		138	$ 4.66
		276	$ 4.45
		506	$ 4.06

Description

General part information

UC3856 Series

The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.

Documents

Technical documentation and resources