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Micrel, Inc.
MIC3230/1/2
( I IN _ RMS ) ?
Leading Edge Blanking
Large transient spikes due to the reverse recovery of the
diode may be present at the leading edge of the current
Eq. (10)
I IN _ AVE =
2
( I IN _ PP ) 2
12
I IN _ RMS =
V OUT × I OUT
I IN _ PEAK = I IN _ AVE +
I IN _ PP
sense signal. (Note: drive current can also cause such
spikes) For this reason a switch is employed to blank the
first 100ns of the current sense signal. See Figure 6.
Eq. (9)
eff × V IN
Eq. (11)
2
Note: If I IN_PP is small then I IN_AVE nearly equals I IN_RMS
VIN
L1
Clock
S
Q
DRV
D1
R
IL
250μa/T
PWM Comparator
Ai
IS
V A
+RSLC–
V CS
V A = I RAMP × R SLP
+
V C
Current Limit
0.45V
0.45V
R CS
–
V CS = IL × R CS
IADJ
R COMP = 10k
COMP
C COMP
Figure 4. Current Sense Circuit (An explanation of the IS pin)
Clock
PWM
T
(1-D)T
DT
I L
V C
m1
m2
I L_PK = I L_AVE + 1/2 I L_PP
I L_AVE = I IN_AVE
I L_PP
0
V C
I L_AVE = I IN_AVE
I FET
I DIODE
0
V C
0
I FET_RMS
I OUT
Figure 5. Current Waveforms
March 2011
11
M9999-030311-D
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