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TS3842B датащи(PDF) 10 Page - List of Unclassifed Manufacturers

номер детали TS3842B
подробное описание детали  High Performance Current Mode Controller
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производитель  ETC [List of Unclassifed Manufacturers]
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Undervoltage Lockout
Two undervoltage lockout comparators have been incorporated to guarantee that the IC is fully
functional before the output stage is enabled. The positive power supply terminal (Vcc) and the
reference output (Vref) are each monitored by separate comparators. Each has built-in hysteresis
to prevent erratic output behavior as their respective thresholds are crossed. The large hysteresis
and low start-up current of the TS3842B makes it ideally suited in off-line converter applications
where efficient bootstrap start-up technique (Figure 33). 36V zener is connected as a shunt
regulator from Vcc to ground. Its purpose is to protect the IC from excessive voltage that can
occur during system start-up. The minimum operating voltage for the TS3842B is 11V.
Output
These devices contain a single totem pole output stage that was specifically designed for direct
drive of power MOSFET’s. It is capable of up to ±1.0A peak drive current and has a typical rise and
fall time of 50 ns with a 1.0nF load. Additional internal circuitry has been added to keep the output
in a sinking mode whenever an undervoltage lockout is active. This characteristic eliminates the
need for an external pull-down resistor.
The SOP-8 surface mount package provides separate pins for Vc(output supply) and Power Ground.
Proper implementation will significantly reduce the level of switching transient noise imposed on
the control circuitry. This becomes particularly useful when reducing the Ipk(max) clamp level.
The separate Vc supply input allows the designer added flexibility in tailling the drive voltage
independent of Vcc. A zener clamp is typically connected to this input when driving power MOSFETs
in systems where Vcc is greater than 20V. Figure 25 shows proper power and control ground
connections in a current sensing power MOSFET application.
Reference
The 5.0V bandgap reference is trimmed to ±2.0% on the TS3842B. Its primary purpose to supply
charging current to the oscillator timing capacitor. The reference has short circuit protection and
is capable of providing in excess of 20mA for powering additional control system circuitry.
Design Considerations
Do not attempt to construct the converter on wire wrap or plug-in prototype boards.
High frequency circuit layout techniques are imperative to prevent pulsewidth jitter. This is usually
caused by excessive noise pick-up imposed on the Current Sense or Voltage Feedback inputs.
Noise immunity can be improved by lowering circuit impedances at these points. The printed
circuit layout should contain a ground plane with low-current signal and high-current switch and
output grounds returning separate paths back to the input filter capacitor. Ceramic bypass capacitors
(0.1
µF) connected directly to Vcc,Vc, and Vref may be required depending upon circuit layout.


Аналогичный номер детали - TS3842B

производительномер деталидатащиподробное описание детали
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Аналогичное описание - TS3842B

производительномер деталидатащиподробное описание детали
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List of Unclassifed Man...
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UC3844A FCI-UC3844A Datasheet
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