參數(shù)資料
型號: KA3845
廠商: Fairchild Semiconductor Corporation
英文描述: SMPS Controller
中文描述: 開關(guān)電源控制器
文件頁數(shù): 6/12頁
文件大小: 91K
代理商: KA3845
KA3842B/KA3843B/KA3844B/KA3845B
6
Figure 5. Oscillator Waveforms and Maximum Duty Cycle
Oscillator timing capacitor, C
T
, is charged by V
REF
through R
T
, and discharged by an internal current source. During the dis-
charge time, the internal clock signal blanks the output to the low state. Selection of R
T
and C
T
therefore determines both
oscillator frequency and maximum duty cycle. Charge and discharge times are determined by the formulas:
t
c
= 0.55 R
T
C
T
Frequency, then, is: f=(t
c
+ t
d
)
-1
Figure 8. Shutdown Techniques
Figure 6. Oscillator Dead Time & Frequency
(Deadtime vs C
T
RT > 5k
)
Figure 7. Timing Resistance vs Frequency
t
D
R
T
C
T
I
n
0.0063R
0.0063R
T
4
--------------------------–
=
ForRT
5K
f
T
T
--------------
=
,
>
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
KA3845B 功能描述:電流型 PWM 控制器 PWM Control IC RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
KA3845BD 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:SMPS Controller
KA3845BDTF 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
KA3846 功能描述:電流型 PWM 控制器 PWM Control IC RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
KA3846 制造商:Fairchild Semiconductor Corporation 功能描述:Analog Switch / Multiplexer (Mux) IC