參數(shù)資料
型號: FSDM0265RN_NL
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: 8 A SWITCHING REGULATOR, 73 kHz SWITCHING FREQ-MAX, PDIP8
封裝: LEAD FREE, MS-001BA, DIP-8
文件頁數(shù): 4/23頁
文件大小: 1073K
代理商: FSDM0265RN_NL
FSDH0265RN, FSDM0265RN
12
Figure 11. KA5-series FPS Full Range EMI scan(67KHz,
no Frequency Modulation) with DVD Player SET
Figure 12. FSDX-series FPS Full Range EMI Scan (67KHz,
with Frequency Modulation) with DVD Player SET
8. Adjusting Peak Current Limit : As shown in Figure 13,
a combined 2.8k
internal resistance is connected to the
non-inverting lead on the PWM comparator. A external
resistance of Rx on the current limit pin forms a parallel
resistance with the 2.8k
when the internal diodes are
biased by the main current source of 900uA.
Figure 13. Peak Current Limit Adjustment
For example, FSDx0265RN has a typical Sense FET peak
current limit (ILIM) of 1.5A. ILIM can be adjusted to 1A by
inserting Rx between the Ipk pin and the ground. The value
of the Rx can be estimated by the following equations:
1.5A : 1A = 2.8k
: Xk ,
X = Rx || 2.8k
.
(X represents the resistance of the parallel network)
Frequency (MHz)
Amplitud
e(dB
V)
Frequency (MHz)
A
m
plitude
(dB
V)
3
Vcc
I
DELAY
I
FB
2kΩ
Vfb
PWM
Comparator
4
Ipk
0.8kΩ
Rx
SenseFET
Current
Sense
900uA
5uA
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