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MC33025DWR2 데이터시트(PDF) 1 Page - ON Semiconductor |
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1 / 20 page © Semiconductor Components Industries, LLC, 2005 October, 2005 − Rev. 7 1 Publication Order Number: MC34025/D MC34025, MC33025 High Speed Double−Ended 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 Startup 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 • Pb−Free Packages are Available* Figure 1. Simplified Application Error Amp Oscillator 4 16 Vref Clock 5 6 RT CT 3 7 Ramp Error Amp Output 2 Inverting Input 1 8 Soft−Start Soft−Start Latching PWM and Steering Flip Flop Ground 10 9 Current Limit/ Shutdown Output B 14 VC 13 VCC 15 UVLO 5.1V Reference 11 Noninverting Input Power Ground 12 Output A This device contains 227 active transistors. PDIP−16 P SUFFIX CASE 648 1 16 SO−16WB DW SUFFIX CASE 751G 1 16 MARKING DIAGRAMS PIN CONNECTIONS 1 16 MC3x025P AWLYYWWG 11 5 2 1 Error Amp Noninverting Input Current Limit/ Shutdown Ground Output A Power Ground VC Output B VCC Vref 9 10 12 13 14 15 16 8 7 6 4 3 (Top View) Soft−Start Ramp CT RT Clock Error Amp Output Error Amp Inverting Input http://onsemi.com *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 16 1 MC3x025DW AWLYYWWG x = 3 or 4 A = Assembly Location WL = Wafer Lot YY = Year WW = Work Week G = Pb−Free Package See detailed ordering and shipping information in the package dimensions section on page 18 of this data sheet. ORDERING INFORMATION |
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