參數(shù)資料
型號(hào)： LV8743V
廠商： SANYO SEMICONDUCTOR CO LTD
元件分類： 穩(wěn)壓器
英文描述： 0.8 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO44
封裝： 0.275 INCH, SSOP-44
文件頁(yè)數(shù)： 11/21頁(yè)
文件大?。?/td> 268K
代理商： LV8743V
LV8743V
No.A0612-19/21
(3) SOFT pin constant setting (Soft start setting)
The switching regulator's soft start operation is set by the value of the capacitor connected between the SOFT pin and
ground.
Use the following equation to determine the value of this capacitor.
Soft start time : Tsoft
Tsoft
≈ C × V/I [sec]
V : Error amplifier noninverting input voltage (NON3/NON4)
I : SOFT pin charge current 1.45
A, typical
(4). SCP pin constant setting (Timer/latch setting)
The time until the output is turned off when the regulator output is shorted is set with the value of the capacitor
connected between the SCP pin and ground.
Use the following equation to determine the value of this capacitor.
Timer/latch operating time : Tscp
Tscp
≈ C × V/I [sec]
V : Threshold voltage (1.7V, typical)
I : SCP pin charge current (2.4
A, typical)
(5) RT pin constant setting (Capacitor charge/discharge current setting)
The charge/discharge current for the capacitor connected to the CT pin used to generate the triangle wave is set with the
value of the resistor connected between the RT pin and ground.
Use the following equation to determine the value of this resistor.
Charge/discharge current : Irt
Irt
≈ V/R [A]
V : The R pin voltage (0.96V, typical)
(6) CT pin constant setting (Triangle wave oscillator frequency setting)
The triangle wave oscillator frequency can be set with the value of the capacitor connected between the CT pin and
ground. (Note that this setting operates in conjunction with the RT pin charge/discharge current setting.)
Use the following equation to determine the value of this capacitor.
Triangle wave oscillator frequency : Fosc
Fosc
≈ 1/{2×C×V/I} [Hz]
V : Triangle wave amplitude (0.48V, typical when Fosc = 10kHz)
* : Note that the amplitude increases with the frequency.
I : Capacitor charge/discharge current
(See item (5), RT pin constant setting.)
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