UC28025

AKTIV

Zweiseitiger, sparsamer Hochgeschwindigkeits-PWM-Controller

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Datenblatt

document-pdfAcrobat UC2802x Economy High-Speed PWM Controller datasheet (Rev. G) (Englisch) PDF | HTML

UC28025

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

Vin (max) (V)

12

Operating temperature range (°C)

-40 to 105

Control mode

Current, Feedforward, Voltage

Topology

Boost, Flyback, Forward, Full bridge, Half bridge, Push pull

Rating

Catalog

Features

Adjustable switching frequency, Current limiting, Error amplifier, Multi-topology, Programmable max duty cycle, Soft start, Synchronization pin

Duty cycle (max) (%)

45

Vin (max) (V)

12

Operating temperature range (°C)

-40 to 105

Control mode

Current, Feedforward, Voltage

Topology

Boost, Flyback, Forward, Full bridge, Half bridge, Push pull

Rating

Catalog

Features

Adjustable switching frequency, Current limiting, Error amplifier, Multi-topology, Programmable max duty cycle, Soft start, Synchronization pin

Duty cycle (max) (%)

45

PDIP (N)

16

181.42 mm² 19.3 x 9.4

SOIC (DW)

16

106.09 mm² 10.3 x 10.3

Peak Current Mode, Average Current Mode, or Voltage Mode (With FeedForward) Control Methods
Practical Operation Up to 1 MHz
50-ns Propagation Delay to Output
±1.5-A Peak Totem Pole Outputs
9-V to 30-V Nominal Operational Voltage
Wide Bandwidth Error Amplifier
Fully Latched Logic With Double Pulse Suppression
Pulse-by-Pulse Current Limiting
Programmable Maximum Duty Cycle Control
Undervoltage Lockout With Hysteresis
Trimmed 5.1-V Reference With UVLO
Same Functionality as UC3823 and UC3825

Peak Current Mode, Average Current Mode, or Voltage Mode (With FeedForward) Control Methods
Practical Operation Up to 1 MHz
50-ns Propagation Delay to Output
±1.5-A Peak Totem Pole Outputs
9-V to 30-V Nominal Operational Voltage
Wide Bandwidth Error Amplifier
Fully Latched Logic With Double Pulse Suppression
Pulse-by-Pulse Current Limiting
Programmable Maximum Duty Cycle Control
Undervoltage Lockout With Hysteresis
Trimmed 5.1-V Reference With UVLO
Same Functionality as UC3823 and UC3825

The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power-supply applications. The UC28023 is a single output PWM for single-ended topologies while the UC28025 offers dual alternating outputs for double-ended and full bridge topologies.

Targeted for cost-effective solutions with minimal external components. UC2802x devices include an oscillator, a temperature compensated reference, a wide bandwidth 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 1-V threshold, a TTL compatible shutdown port, and a soft-start pin which doubles 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 800 mV of hysteresis assures low start-up current. During undervoltage lockout, the outputs are high impedance. Propagation delays through the comparators and logic circuitry have been minimized while maximizing bandwidth and slew rate of the error amplifier.

Devices are available in the industrial temperature range of –40°C to 105°C. Package offerings are 16-pin SOIC (DW), or 16-pin PDIP (N) packages.

The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power-supply applications. The UC28023 is a single output PWM for single-ended topologies while the UC28025 offers dual alternating outputs for double-ended and full bridge topologies.

Targeted for cost-effective solutions with minimal external components. UC2802x devices include an oscillator, a temperature compensated reference, a wide bandwidth 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 1-V threshold, a TTL compatible shutdown port, and a soft-start pin which doubles 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 800 mV of hysteresis assures low start-up current. During undervoltage lockout, the outputs are high impedance. Propagation delays through the comparators and logic circuitry have been minimized while maximizing bandwidth and slew rate of the error amplifier.

Devices are available in the industrial temperature range of –40°C to 105°C. Package offerings are 16-pin SOIC (DW), or 16-pin PDIP (N) packages.

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Alle anzeigen 3

	Typ	Titel		Datum
*	Data sheet	UC2802x Economy High-Speed PWM Controller datasheet (Rev. G)	PDF \| HTML	09 Dez 2016
	Selection guide	Power Management Guide 2018 (Rev. R)		25 Jun 2018
	Application note	U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply		05 Sep 1999

Design und Entwicklung

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