KA3842B PDF

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These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier. Protection circuity Includes built in under-voltage lockout and current limiting. Duty Cycle Min. Parameter measured at trip point of latch 2. These parameters, although guaranteed, are not tested in production. Figure 1. Open Loop Test Circuit High peak currents associated with capacitive loads necessitate careful grounding techniques Timing and bypass capacitors should be connected close to pin 5 in a single point ground.

The transistor and 5K potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3. Pin 6 should be shunted to ground with a bleeder resistor to prevent activating the power switch with output leakage current.

Figure 3. Error Amp Configuration Figure 4. During the discharge time, the internal clock signal blanks the output to the low state. Selection of RT and CT therefore determines both oscillator frequency and maximum duty cycle. Either method causes the output of the PWM comparator to be high refer to block diagram. At this point the reference turns off, allowing the SCR to reset.

Figure 9. Note that capacitor, C, forms a filter with R2 to suppress the leading edge switch spikes. As used herein: 1. Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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