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Updated at 17/06/2025 10:30:15(UTC+8)

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Description

DESCRIPTION
The UCC1889 controller is optimized for use as an off-line, low power, low voltage, regulated bias supply. The unique circuit topology utilized in this device can be visualized as two cascaded flyback converters, each operating in the discontinuous mode, and both driven from a single external power switch. The significant benefit of this approach is the ability to achieve voltage conversion ratios of 400V to 12V with no transformer and low internal losses.
FEATURES
• Transformerless Off-line Applications
• Ideal Primary-side Bias Supply
• Efficient BiCMOS Design
• Wide Input Range
• Fixed or Adjustable Low Voltage Output
• Uses Low Cost SMD Inductors
• Short Circuit Protected
• Optional Isolation Capability

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UCC3889N Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Through Hole
Number of Pins	8 Pin
Case/Package	PDIP-8
Frequency	100 kHz
Supply Voltage (DC)	400V (max)
Number of Outputs	1 Output
Input Voltage (DC)	9.30 V
Output Voltage	20 V
Output Current	200 mA
Number of Positions	8 Position
Quiescent Current	1.20 mA
Number of Regulated Outputs	1 Output
Rise Time	35 ns
Switching Frequency	250 kHz
Topology	Flyback
Duty Cycle	55 %
Input Voltage (AC Max)	265 v
Input Voltage (AC Min)	80 v
Maximum Duty Cycle	55 %
Fall Time	30 ns
Operating Temperature (Max)	70 ℃
Operating Temperature (Min)	0 ℃
Input Voltage	6V ~ 9.3V
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Size-Length	9.81 mm
Size-Width	6.35 mm
Size-Height	4.57 mm
Operating Temperature	0℃ ~ 70℃
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/06/15
ECCN Code	EAR99

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