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Offline Controllers | MC34025

High Speed Double-Ended PWM Controller

Obsolete

Datasheet

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Overview

The MC34025 series are high speed, fixed frequency, double-ended pulse width modulator controllers optimized for high frequency operation. They are specifically designed for Off-Line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external components. These integrated circuits feature an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high speed current sensing comparator, steering flip-flop, and dual high current totem pole outputs ideally suited for driving power MOSFETs.

Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering.

The flexibility of this series allows it to be easily configured for either current mode or voltage mode control.

  • 50 ns Propagation Delay to Outputs
  • Dual High Current Totem Pole Outputs
  • Wide Bandwidth Error Amplifier
  • Fully-Latched Logic with Double Pulse Suppression
  • Latching PWM for Cycle-By-Cycle Current Limiting
  • Soft-Start Control with Latched Overcurrent Reset
  • Input Undervoltage Lockout with Hysteresis
  • Low Start-Up Current (500 mA Typ)
  • Internally Trimmed Reference with Undervoltage Lockout
  • 45% Maximum Duty Cycle (Externally Adjustable)
  • Precision Trimmed Oscillator
  • Voltage or Current Mode Operation to 1.0 MHz
  • Functionally Similar to the UC3825 Simplified
  • Pb-Free Packages are Available

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MC34025DWG

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Obsolete

CAD Model

Pb

A

H

P

SOIC-16W

751G-03

3

260

TUBE

47

N

Push-Pull

Current/Voltage Mode

1000

No

Yes

Yes

No

-

30

200 / 200

Price N/A

More Details

MC34025DWR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-16W

751G-03

3

260

REEL

1000

N

Push-Pull

Current/Voltage Mode

1000

No

Yes

Yes

No

-

30

200 / 200

Price N/A

More Details

MC34025PG

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Obsolete

CAD Model

Pb

A

H

P

PDIP-16

648-08

NA

0

TUBE

25

N

Push-Pull

Current/Voltage Mode

1000

No

Yes

Yes

No

-

30

200 / 200

Price N/A

More Details

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