MC33129 Datasheet | Motorola Semiconductor

feature a unique internal fault timer that provides automatic restart for overload recovery. For enhanced system efficiency, a start/run parator is included to implement bootstrapped operation of VCC. Other functions contained are a temperature pensated reference, reference amplifier, fully accessible error amplifier, sawtooth oscillator with sync input, pulse width modulator parator, and a high current totem pole driver ideally suited for driving a power MOSFET. Also included are protective features consisting of soft- start, undervoltage lockout, cycle- by- cycle current limiting, adjustable deadtime, and a latch for single pulse metering. Although these devices are primarily intended for use in digital telephone systems, they can be used cost effectively in many other applications. - Current Mode Operation to 300 k Hz HIGH PERFORMANCE CURRENT MODE CONTROLLERS SEMICONDUCTOR TECHNICAL DATA 14 1 P SUFFIX PLASTIC PACKAGE CASE 646 - - - - - - - - - Automatic Feed Forward pensation Latching PWM for Cycle- by- Cycle Current Limiting Continuous Retry after Fault Timeout Soft- Start with Maximum Peak Switch Current Clamp Internally Trimmed 2% Bandgap Reference High Current Totem Pole Driver Input Undervoltage Lockout Low Startup and Operating Current Direct Interface with Motorola SENSEFET Products Drive Output Drive Ground Ramp Input 14 1 D SUFFIX PLASTIC PACKAGE CASE 751A (SO- 14) PIN CONNECTIONS 1 2 3 14 VCC 13 Start/Run Output 12 CSoft- Start Feedback/ 11 PWM Input Error Amp 10 Inverting Input 9 Error Amp Noninverting Input 8 Vref 1.25 V (Top View) Simplified Block Diagram Start/Run 12 Soft- Start and Fault Timer Undervoltage Lockout 1.25V Reference Gnd 7 Error Amp 6 X2 Latching PWM RT/CT Sync/Inhibit Input 5 4 Oscillator 9 Noninverting Input + 10 - Inverting Input 11 Feedback/ 1 PWM Input Drive Out 2 Drive Gnd 3 Ramp Input 13 Start/Run Output VCC Sync/Inhibit 4 Input RT/CT 5 Vref 2.5 V 6 CSoft- Start Gnd 7 Vref 1.25V ORDERING INFORMATION Device MC34129D...