Datenblatt-Suchmaschine für elektronische Bauteile |
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MC33066 Datenblatt(PDF) 4 Page - Motorola, Inc |
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MC33066 Datenblatt(HTML) 4 Page - Motorola, Inc |
4 / 12 page MC34066 MC33066 4 MOTOROLA ANALOG IC DEVICE DATA VCC 15 9 Enable/ UVLO Adjust Osc Deadtime 1 RDT ROSC COSC Osc RC 2 One–Shot RC 16 CT RT Osc Control Current 3 IOSC RVFO Error Amp Output Error Amp Inverting Input 6 7 Error Amp Noninverting Input 8 CSoft–Start 11 7k 50k 7k 50k Reference Regulator 5.1V Vref UVLO 8V VCC UVLO UVLO VCC 4.2V/4V Q1 Q2 Drivers 5.1V Oscillator Steering Flip–Flop IOSC 4.9V/3.6V ton T Q Q R One–Shot 4.9V/3.6V UVLO + Fault Fault Comparator Q R S Current Mirror Error Amp Output Clamp Fault Fault Latch 1.0V 2.5V EA Clamp Soft–Start Buffer 9 µA Error Amplifier Vref 5 Gnd 4 14 12 13 10 Drive Output B Drive Gnd Fault Input – + + – + – – + – + + – + – Drive Output A Figure 1. MC34066 Representative Block Diagram OPERATING DESCRIPTION Introduction As power supply designers have strived to increase power conversion efficiency and reduce passive component size, high frequency resonant mode power converters have emerged as attractive alternatives to conventional square–wave control. When compared to square–wave converters, resonant mode control offers several benefits including lower switching losses, higher efficiency, lower EMI emission, and smaller size. This integrated circuit has been developed to support new trends in power supply design. The MC34066 Resonant Mode Controller is a high performance bipolar IC dedicated to variable frequency power control at frequencies exceeding 1.0 MHz. This integrated circuit provides the features, performance and flexibility for a wide variety of resonant mode power supply applications. The primary purpose of the control chip is to supply precise pulses to the gates of external power MOSFETs at a repetition rate regulated by a feedback control loop. The MC34066 can be operated in any of three modes as follows: 1) fixed on–time, variable frequency; 2) fixed off–time, variable frequency; and 3) combinations of 1 and 2 that change from fixed on–time to fixed off–time as the frequency increases. Additional features of the IC ensure that system startup and fault conditions are administered in a safe, controlled manner. A simplified block diagram of the IC is shown on the first page of this data sheet, which identifies the main functional blocks and the block–to–block interconnects. Figure 1 is a detailed functional diagram which accurately represents the internal circuitry. The various functions can be divided into two sections. The first section includes the primary control path which produces precise output pulses at the desired frequency Oscillator, a One–Shot, a pulse Steering Flip–Flop, a pair of power MOSFET Drivers, and a wide bandwidth Error Amplifier. The second section provides several peripheral support functions including a voltage reference, undervoltage lockout, Soft–Start circuit, and a fault detector. Primary Control Path The output pulse width and repetition rate are regulated through the interaction of the variable frequency Oscillator, One–Shot timer and Error Amplifier. The Oscillator triggers the One–Shot which generates a pulse that is alternately steered to a pair of totem–pole output drivers by a toggle Flip–Flop. The Error Amplifier monitors the output of the regulator and modulates the frequency of the Oscillator. High–speed Schottky logic is used throughout the primary control channel to minimize delays and enhance high frequency characteristics. |
Ähnliche Teilenummer - MC33066 |
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Ähnliche Beschreibung - MC33066 |
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