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LM3101N bảng dữ liệu(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM3101N
Giải thích chi tiết về linh kiện  Secondary-Side PWM Controller
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LM3101N bảng dữ liệu(HTML) 10 Page - National Semiconductor (TI)

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Functional Description (Continued)
To operate under current mode or charge mode control
insert a resistor RMC between the MC pin and ground and
connect the CMI pin to the Current Mode Sense Circuit (see
Figure 4 ) At the MC pin a voltage proportional to the oscil-
lator ramp voltage develops (see
Figure 3 ) The voltage
ramp applied to RMC generates a current ramp which is
duplicated on the CMI pin due to the current mirror The
current ramp which flows out of the CMI pin to the resistor
RF is the compensation ramp needed to stabilize convert-
ers operating at duty cycles above 50% The slope of the
compensating ramp can be scaled by RF which is connect-
ed between the CMI pin and the terminating resistor RS of
the current sense transformer In all practical cases RF will
be much greater than RS For both control modes the cur-
rent ramp provides slope compensation according to the
equation
D
ICOMP Dt e 24  103 (RT  RMC)
m
A ms X
So with RT equal 25 kX and RMC equal 6 kX the compen-
sation ramp slope is
D
ICOMP Dt e 24  103 (25 kX  6kX) e 160 mA ms
The resistor RF together with the capacitor CF serves as an
RC filter for the leading edge spike of the current sense
waveform (the spike is caused by the output rectifier reverse
recovery andor the winding capacitance of the power
transformer)
CHARGE MODE CONTROL
Under charge mode control the current sense transformer
drives a capacitor C1 that integrates the sensed switch
current on a cycle-by-cycle basis
Figure 5 shows the inte-
grating current sense circuitry and the simplified details of
the associated internal circuitry of the LM3101 Transistor
Q1 discharges the integrating capacitor C1 once every
switch cycleduring the switch off-time (Q1 can provide up
to 20 mA of discharge current) Charge mode control yields
the fastest average current control loop
TLH11436 – 10
TLH11436 – 11
FIGURE 5 Charge Mode Operation
10


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