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Updated at 02/11/2025 10:30:15(UTC+8)

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Description

DESCRIPTION
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.
FEATURES
• Pin-for-Pin Compatible With the UC3846
• 65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs
• Improved Current Sense Amplifier With Reduced Noise Sensitivity
• Differential Current Sense with 3V Common Mode Range
• Trimmed Oscillator Discharge Current for Accurate Deadband Control
• Accurate 1V Shutdown Threshold
• High Current Dual Totem Pole Outputs (1.5A peak)
• TTL Compatible Oscillator SYNC Pin Thresholds
• 4kV ESD Protection

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UC3856N Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Through Hole
Number of Pins	16 Pin
Case/Package	PDIP-16
Frequency	1 MHz
Supply Voltage (DC)	8.00V (min)
Number of Outputs	2 Output
Input Voltage (DC)	40.0 V
Output Voltage	13.1 V
Output Current	500 mA
Supply Current	23 mA
Power Dissipation	1 W
Number of Regulated Outputs	2 Output
Rise Time	40 ns
Switching Frequency	200 kHz
Topology	Buck, Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull
Duty Cycle	50 %
Maximum Duty Cycle	50 %
Fall Time	40 ns
Operating Temperature (Max)	150 ℃
Operating Temperature (Min)	-55 ℃
Power Dissipation (Max)	1000 mW
Supply Voltage	8V ~ 40V
Supply Voltage (Max)	40 V
Supply Voltage (Min)	8 V
Input Voltage	40 V
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Size-Length	19.3 mm
Size-Width	6.35 mm
Size-Height	4.57 mm
Operating Temperature	0℃ ~ 70℃ (TA)
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance Edition	2015/06/15
ECCN Code	EAR99

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