FAN8902 データシートの表示（PDF） - Fairchild Semiconductor
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FAN8902 Datasheet PDF : 14 Pages
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FAN8902(KA3902)
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,
VRAMP
=
R-----1----4-
R11
×
∆VOSC
R12
VCMD
1
+
_
To PWM
Comparator
C2
R14
TR2
R11
Slop Compensation
7. Motor Stall Current Limitation
Vref
6
5
FAN8902
OSC
VBAT
+
C1 C2
D1
M
FAN8902
CMD 1
4R
VCMD
I*
+
+
−
Buffer-OP-amp
+
Logic
−
R
PWM
COMP
×5
VCS
VLA
14
12
10
Q1
R2
R10
IM
C4
R3
VGS
Q2
R5
VRS
RS
8
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