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TS39101CS25RL bảng dữ liệu(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

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Giải thích chi tiết về linh kiện  1A Ultra Low Dropout Voltage Regulator with Multi-Function
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nhà sản xuất  TSC [Taiwan Semiconductor Company, Ltd]
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TS39101/2/4
1A Ultra Low Dropout Voltage Regulator
with Multi-Function
5/9
Version: A08
Application Information (Continue)
Output Capacitor Requirement
The TS39101/2/4 requires an output capacitor to maintain stability and improve transient response is necessary. The
value of this capacitor is dependent upon the output current, lower currents allow smaller capacitors. TS39101/2/4
output capacitor selection is dependent upon the ESR of the output capacitor to maintain stability. When the output
capacitor is 10uF or greater, the output capacitor should have an ESR less than 2Ω. This will improve transient
response as well as promote stability. Ultra low ESR capacitors (<100mΩ), such as ceramic chip capacitors, may
promote instability. These very low ESR levels may cause an oscillation and/or under damped transient response. A
low ESR solid tantalum capacitor works extremely well and provides good transient response and stability over
temperature aluminum electrolytes can also be used, as long as the ESR of the capacitor is <2Ω. The value of the
output capacitor can be increased without limit. Higher capacitance values help to improve transient response and
ripple rejection and reduce output noise.
Input Capacitor Requirement
An input capacitor of 1uF or greater is recommended when the device is more than 4” away from the bulk AC supply
capacitance or when the supply is a battery. Small, surface mount, ceramic chip capacitors can be used for bypassing.
Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity
of the output voltage.
Minimum Load Current
The TS39101/2/4 is specified between finite loads. If the output current is too small leakage currents dominate and the
output voltage rises. A 10mA minimum load current is necessary for proper regulation.
Adjustable Regulator Design
The adjustable regulator versions (TS39102/4) is allow to programming the output voltage anywhere between 1.25
and the 16V maximum operating rating of the family.
Two resistors are used. Resistors can be quite large up to 1MΩ, because of the very high input impedance and low
bias current of the sense comparator, the resistor values are calculated by:
Where VOUT is the desired output voltage. Above application circuit shows component definition. Applications with
widely varying load currents may scale the resistors to draw the minimum load current required for proper operation.
Enable Input
TS39101/2/4 versions feature an active-high enable (EN) input that allows ON/OFF control of the regulator. Current
drain reduces to “zero” when the device is shutdown, with only micro-amperes of leakage current. The EN input has
TTL/CMOS compatible thresholds for simple interfacing with logic interfacing. EN may be directly tied to VIN and pulled
up to the maximum supply voltage.


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