UC3844BDG - ON Semiconductor

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

UC3844BDG
Manufacturer

ON Semiconductor
ChipWorker Part#

CW8857900
Category

Voltage Regulator
Package

SOIC-14
Description

UC3844BDG, PWM Current Mode Controller, 1A, 275kHz, 30V, 14Pin SOIC
Documentation

Datasheet

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UC3844BDG Specifications

Attribute	Attribute Value

Part Number	UC3844BDG
Manufacturer	ON Semiconductor
ChipWorker Part#	CW8857900
Category	Voltage Regulator
Documentation	Datasheet
Mounting Style	Surface Mount
Number of Pins	14 Pin
Case/Package	SOIC-14
Frequency	250 kHz
Supply Voltage (DC)	12.0V (min)
Operating Voltage	10V ~ 36V
Halogen Free Status	Halogen Free
Number of Outputs	1 Output
Output Voltage	13.5 V
Output Current	200 mA
Number of Positions	14 Position
Power Dissipation	862 mW
Rise Time	50 ns
Switching Frequency	500 kHz
Topology	Flyback, Forward, Step-Up, Step-Down
Duty Cycle	48 %
Maximum Duty Cycle	48 %
Fall Time	50 ns
Operating Temperature (Max)	70 ℃
Operating Temperature (Min)	0 ℃
Power Dissipation (Max)	862 mW
Supply Voltage	10V ~ 30V
Supply Voltage (Max)	25 V
Supply Voltage (Min)	12 V
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Size-Length	8.75 mm
Size-Width	4 mm
Size-Height	1.5 mm
Operating Temperature	0℃ ~ 70℃
Product Lifecycle Status	Active
Packaging	Each
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/12/17
ECCN Code	EAR99

Product Description

The UC3844BDG is a high performance fixed frequency Current Mode Controller designed for off-line and DC-to-DC converter applications offering the designer a cost-effective solution with minimal external components. This integrated circuits feature an oscillator, a temperature compensated reference, high gain error amplifier, current sensing comparator and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference under-voltage lockouts each with hysteresis, cycle-by-cycle current limiting, a latch for single pulse metering and a flip-flop which blanks the output off every other oscillator cycle, allowing output deadtimes to be programmed from 50 to 70%. The UCX844B has UVLO thresholds of 16V (on) and 10V (off), ideally suited for off-line converters. The UCX845B is tailored for lower voltage applications having UVLO thresholds of 8.5V (on) and 7.6V (off).
Trimmed oscillator for precise frequency control
Oscillator frequency guaranteed at 250kHz
Current mode operation to 500kHz output switching frequency
Output dead time adjustable from 50 to 70%
Automatic feed forward compensation
Latching PWM for cycle-by-cycle current limiting
Internally trimmed reference with under-voltage lockout
High current totem pole output
Under-voltage lockout with hysteresis
Low startup and operating current
36V Bias and driver voltage
30mA Total power supply and Zener current
+150°C Maximum junction temperature
ESD sensitive device, take proper precaution while handling the device.

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