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ISL78840ASRHF/PROTO bảng dữ liệu(PDF) 9 Page - Intersil Corporation

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Giải thích chi tiết về linh kiện  Radiation Hardened, High Performance IndustryStandard Single-Ended Current Mode PWM Controller
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ISL78840ASRHF/PROTO bảng dữ liệu(HTML) 9 Page - Intersil Corporation

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9
FN6991.0
December 21, 2009
RCS = 295mΩ
Determine the amount of voltage, Ve, that must be
added to the current feedback signal using Equation 12.
Ve = 92.4mV
Using Equation 17, solve for the summing resistor, R9,
from CT to CS.
R9 = 2.67kΩ
Determine the new value of RCS (R’CS) using
Equation 18.
R’CS = 350mΩ
Additional slope compensation may be considered for
design margin. The above discussion determines the
minimum external ramp that is required. The buffer
transistor used to create the external ramp from RTCT
should have a sufficiently high gain (>200) so as to
minimize the required base current. Whatever base
current is required reduces the charging current into
RTCT and will reduce the oscillator frequency.
Fault Conditions
A Fault condition occurs if VREF falls below 4.65V. When a
Fault is detected OUT is disabled. When VREF exceeds
4.80V, the Fault condition clears, and OUT is enabled.
Ground Plane Requirements
Careful layout is essential for satisfactory operation of
the device. A good ground plane must be employed. A
unique section of the ground plane must be designated
for high di/dt currents associated with the output stage.
VDD should be bypassed directly to GND with good high
frequency capacitors.
References
[1] Ridley, R., “A New Continuous-Time Model for
Current Mode Control”, IEEE Transactions on Power
Electronics, Vol. 6, No. 2, April 1991.
ISL78840ASRH, ISL78841ASRH, ISL78843ASRH, ISL78845ASRH



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