參數(shù)資料
型號(hào): UC3842AL-S08-R
廠商: UNISONIC TECHNOLOGIES CO LTD
元件分類: 穩(wěn)壓器
英文描述: CURRENT MODE PWM CONTROL CIRCUITS
中文描述: 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝: LEAD FREE, SOP-8
文件頁(yè)數(shù): 6/9頁(yè)
文件大?。?/td> 106K
代理商: UC3842AL-S08-R
UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 9
QW-R103-002,D
CURRENT S ENS E CIRCUIT
5
3
1
2R
R
1V
C
Rs
R
Is
Error Amplifier
Current Sense Comparator
Peak current (Is) determined by the formula: Ismax=10V/Rs.
A small RC filter be required to suppress switch transients.
S LOPE COMPENS AT ION
8
4
3
Isense
R1
R2
Rsense
C
RT
CT
0
μ
F
A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope
compensation for converts requiring duty cycles over 50%.Note that capacitor C, forms a filter with R2 to suppress
the leading edge switch spikes.
OS CILLAT OR S ECT ION
5
4
8
RT
CT
Large RT
Small CT
Small RT
Large CT
V4
V4
INTERNAL CLOCK
INTERNAL CLOCK
Dead time vs. C
T
(R
T
>5k
) Timing Resistance vs. Frequency
1
10
100
1
10
100
0.1
t
s
CT (nF)
100
1
10
6
10
5
10
4
10
3
10
102
R
)
Frequency (Hz)
CT=2.2nF
CT=4.7nF
CT=10nF
CT=22nF
CT=47nF
CT=100nF
相關(guān)PDF資料
PDF描述
UC3842AL-S08-T CURRENT MODE PWM CONTROL CIRCUITS
UC3842A-S08-R CURRENT MODE PWM CONTROL CIRCUITS
UC3842A-S08-T CURRENT MODE PWM CONTROL CIRCUITS
UC3843A-D08-T CURRENT MODE PWM CONTROL CIRCUITS
UC3843AL-D08-T CURRENT MODE PWM CONTROL CIRCUITS
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