參數(shù)資料
型號(hào): HA16341NT
英文描述: SMPS Controller
中文描述: 開關(guān)電源控制器
文件頁數(shù): 15/21頁
文件大小: 225K
代理商: HA16341NT
HA16341NT/FP, HA16342NT/FP
Rev.1, Jan. 2001, page 15 of 21
Timing Chart 4 (Soft Start)
CT
SS
OUT
(PWM)
Vth
CTH
: 3.4V
Note *
Vth
CTL
: 1.3V
Note: Self-oscillation: Vth
CTH
= 3.4V typ
Synchronized operation: Vth
CTH
= 2.9V typ
Case V
HSS
Vth
CTH
Maximum duty would be the value specified in page 9.
Case V
HSS
<
Vth
CTH
Maximum duty decrease to the corresponding value.
Please refer to formula 1 as design value of maximum duty.
Max duty = (tss
0.63
μ
s
Td1)
×
Operating frequency
Formula 1
C
CT
Ici
tss =
Ici
C
Vth
CTH
Vth
CTL
: CT charge current
: CT terminal capacitor
: CT upper trip point
: CT lower trip point
(V
HSS
Vth
CTL
)
Select values R1, R2 and C1 for suitable maximum duty and SS time constant.
SS
SS
CT
Vref (5V)
SS
HA16341
C
Figure A. SS Terminal Application
R1 R2
R1 + R2
R1
R2
C1
VHSS =
Vref (5V)
R2
R1 + R2
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