MC33025: Up-to-1 MHz Dual Output (Push-pull or H-Bridge) Voltage-or-Current-Mode PWM Controller

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.

Features
  • 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
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
High Speed Double-Ended PWM ControllerMC34025/D (493.0kB)9
Package Drawings (2)
Document TitleDocument ID/SizeRevision
PDIP-16648-08 (34.2kB)V
SO-16 WB751G-03 (56.7kB)D
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
MC33025DWGActive, Not RecPb-free Halide freeSOIC-16W751G-033Tube47$2.4266
MC33025DWR2GActivePb-free Halide freeSOIC-16W751G-033Tape and Reel1000$2.4266
MC33025PGActivePb-free Halide freePDIP-16648-08NATube25$2.4266
Specifications
ProductTopologyControl Modefsw Typ (kHz)Stand-by ModeUVLO (V)Short Circuit ProtectionLatchSoft StartVCC Max (V)Drive Cap. (mA)
MC33025DWR2GPush-PullCurrent/Voltage Mode1000NoYesYesNoYes30200 / 200
MC33025PGPush-PullCurrent/Voltage Mode1000NoYesYesNoYes30200 / 200
High Speed Double-Ended PWM Controller (493.0kB) MC33025
SO-16 WB MC74HCT4851A
PDIP-16 MC10H350