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

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Description

The UC28025N is a fixed-frequency Pulse Width Modulation (PWM) Controller optimized for high-frequency switched-mode power supply applications. The UC28025 offers dual alternating outputs for double-ended and full bridge topologies. The UC2802x include an oscillator, a temperature compensated reference, a wide band width error amplifier, a high-speed current-sense comparator and high-current active-high totem-pole outputs to directly drive external MOSFETs. Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port and a soft-start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An undervoltage lockout section with 800mV of hysteresis assures low start-up current. During undervoltage lockout, the outputs are high impedance.
Peak current mode, average current mode, or voltage mode (with feed-forward) control methods
Wide bandwidth error amplifier
Fully latched logic with double pulse suppression
Pulse-by-pulse current limiting
Programmable maximum duty cycle control
Under-voltage lockout with hysteresis
Trimmed 5.1V Reference with UVLO
50ns Propagation delay to output
±1.5A Peak totem pole outputs
Green product and no Sb/Br
Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

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UC28025N Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Through Hole
Number of Pins	16 Pin
Case/Package	DIP-16
Frequency	1 MHz
Supply Voltage (DC)	9.00V (min)
Number of Outputs	2 Output
Input Voltage (DC)	30.0 V
Output Voltage	4 V
Output Current	2.5 mA
Supply Current	35 mA
Number of Positions	16 Position
Power Dissipation	1 W
Quiescent Current	1.10 mA
Number of Regulated Outputs	2 Output
Rise Time	60 ns
Switching Frequency	340kHz ~ 460kHz
Topology	Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull
Duty Cycle	45 %
Maximum Duty Cycle	45 %
Fall Time	60 ns
Operating Temperature (Max)	105 ℃
Operating Temperature (Min)	-40 ℃
Power Dissipation (Max)	1000 mW
Supply Voltage	9V ~ 30V
Supply Voltage (Max)	30 V
Supply Voltage (Min)	9 V
Input Voltage	30 V
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Operating Temperature	-40℃ ~ 105℃
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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