參數(shù)資料
型號: FAN8048
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 運動控制電子
英文描述: 2 DC-DC Converter & 4-CH PWM Motor IC
中文描述: DISK DRIVE MOTOR CONTROLLER, 0.5 A, PDSO48
封裝: 7 X 7 MM, LQFP-48
文件頁數(shù): 22/34頁
文件大?。?/td> 903K
代理商: FAN8048
FAN8048
22
In Figure 16, when control voltage VX is always higher than VY and triangular waveform voltage V
PCT
, Switch pairs C and D
will alternately switching and their circuit is designed to operate as a step-up converter, whose output voltage is always higher
than input voltage. Figure 15 shows the operational waveform at the output terminal of each switching device when it acts as a
step-up converter. In this operations section, Switch A is always turned-on and switch B is always turned-off. Also, to limit the
maximum output voltage in this mode, the maximum duty ratio is limited to about 75%.
(a)
(b)
Figure 15. Synchronous Step-up Converter
Figure 16. Output switch operational waveforms in Boost (Step-up) converter mode
D
A
B
C
R
VIN
VSYS
V
B
V
C
V
D
t
V
L
Ton
Ts
Toff
(V
IN
-V
SYS
)
VSYS
A
B
0
t
i
L
0
(V
IN
)
V
A
V
B
V
C
V
D
High
Low
V
X
V
Y
PCT
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