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SM6702-30HA bảng dữ liệu(PDF) 5 Page - Nippon Precision Circuits Inc

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nhà sản xuất  NPC [Nippon Precision Circuits Inc]
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SM6702-30HA bảng dữ liệu(HTML) 5 Page - Nippon Precision Circuits Inc

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SM6702 series
NIPPON PRECISION CIRCUITS—5
FUNCTIONAL DESCRIPTION
Step-up Principle
The SM6702 series use a transistor to switch the input supply in a non-isolated chopper switching regulator
configuration. The figure below shows the basic step-up switching regulator circuit.
If the transistor is ON for an interval tON and then instantly turned OFF, the energy stored in the coil L during
the interval tON generates a voltage VL across the coil. This voltage is superimposed on the input voltage such
that the peak voltage reaches VIN + VL which forces the diode D to conduct and release the stored energy into
the output.
During normal operation, the above switching occurs repeatedly at a frequency controlled by an oscillator
(which can change depending on the input and output load conditions), generating a square wave output which
is then smoothed by the output capacitor C. Thus the output voltage (VOUT > VIN) has been stepped up.
PFM Control
In SM6702 series, the LX transistor ON interval is fixed, and the OFF interval varies in response to the input
voltage and load changes. Thus the resulting switching cycle frequency varies, called pulse frequency modula-
tion.
L
VIN
VOUT
D
Tr
GND
C


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