參數資料
型號: KA3902
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 運動控制電子
英文描述: DC FAN Motor Controller
中文描述: BRUSH DC MOTOR CONTROLLER, 0.8 A, PDIP14
封裝: 0.300 INCH, DIP-14
文件頁數: 8/14頁
文件大?。?/td> 127K
代理商: KA3902
FAN8902(KA3902)
8
6. Slope Compensation
An unconditional instability of the inner current loop exists for any fixed frequency current-mode converter operating above
50% duty cycle. Therefore, to guarantee current loop stability, the slope of the compensation ramp must be greater than
one-half of the down slope of the current waveform. The ramp voltage for slope compensation is as follow,
7. Motor Stall Current Limitation
VRAMP
----------
=
VOSC
×
OSC
FAN8902
1
6
5
TR2
R11
C2
R12
R14
Vref
To PWM
Comparator
+
_
V
CMD
Slop Compensation
+
+
+
×
5
1
14
10
12
M
VBAT
C1
C2
Q1
D1
IM
Q2
V
RS
R
S
R5
4R
R
V
CMD
R3
C4
R2
V
GS
R10
I*
Logic
PWM
COMP
Buffer-OP-amp
V
CS
V
LA
FAN8902
CMD
+
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