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

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Description

The UCC28084D is a BiCMOS Pulse Width Modulation (PWM) Controller for DC to DC or off-line fixed-frequency current-mode switching power supplies. The dual output stages are configured for the push-pull topology. Both outputs switch at half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 110ns, limiting each output"s duty cycle to less than 50%. The major differences include the addition of a programmable slope compensation ramp to the CS signal and the removal of the error amplifier. The current flowing out of the ISET pin through an external resistor is monitored internally to set the magnitude of the slope compensation function. This device also includes an internal discharge transistor from the CS pin to ground, which is activated at each clock cycle after the pulse is terminated. This discharges any filter capacitance on the CS pin during each cycle and helps minimize filter capacitor values and current sense delay.
Programmable slope compensation
Cycle-by-cycle current limiting
Current sense discharge transistor to improve dynamic response
Internally trimmed bandgap reference
Undervoltage lockout with hysteresis
Green product and no Sb/Br

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UCC28084D Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	8 Pin
Case/Package	SOIC-8
Frequency	200 kHz
Supply Voltage (DC)	4.10V (min)
Number of Outputs	2 Output
Input Voltage (DC)	15.0 V
Output Voltage	500 mV
Output Current	1 A
Supply Current	2.5 mA
Number of Positions	8 Position
Power Dissipation	650 mW
Number of Regulated Outputs	2 Output
Rise Time	25 ns
Switching Frequency	200 kHz
Topology	Half-Bridge, Push-Pull
Duty Cycle	50 %
Maximum Duty Cycle	50 %
Fall Time	25 ns
Operating Temperature (Max)	85 ℃
Operating Temperature (Min)	-40 ℃
Power Dissipation (Max)	650 mW
Supply Voltage	4.3V ~ 15V
Supply Voltage (Max)	15 V
Supply Voltage (Min)	4.1 V
Input Voltage	15 V
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Size-Length	4.9 mm
Size-Width	3.91 mm
Size-Height	1.58 mm
Operating Temperature	-40℃ ~ 85℃
Product Lifecycle Status	Active
Packaging	Each
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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