參數(shù)資料
型號(hào)： TS3842B
廠商： Electronic Theatre Controls, Inc.
英文描述： High Performance Current Mode Controller
中文描述： 高性能電流模式控制器
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 521K
代理商： TS3842B
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
μ
F) connected directly to Vcc,Vc, and Vref may be required depending upon circuit layout.
相關(guān)PDF資料
PDF描述
TS3842BCD High Performance Current Mode Controller
TS3842BCS High Performance Current Mode Controller
TS3843B High Performance Current Mode Controller
TS3843BCD High Performance Current Mode Controller
TS3843BCS High Performance Current Mode Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TS3842BCD 制造商:Taiwan Semiconductor 功能描述:IC CURRENT MODE PWM 3842 DIP8
TS3842BCS 制造商:Taiwan Semiconductor 功能描述:CURRENT MODE PWM SMD 3842 SOIC8
TS3843B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High Performance Current Mode Controller
TS3843BCD 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High Performance Current Mode Controller
TS3843BCS 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High Performance Current Mode Controller
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