NCP1081
http://onsemi.com
16
Current Limit Comparator
The NCP1081 current limit block behind the CS pin
senses the current flowing in the external MOSFET for
current mode control and cyclebycycle current limit. This
is performed by the current limit comparator which, on the
CS pin, senses the voltage across the external Rcs resistor
located between the source of the MOSFET and the ARTN
pin.
The NCP1081 also provides a blanking time function on
CS pin which ensures that the current limit and PWM
comparators are not prematurely trigged by the current spike
that occurs when the switching MOSFET turns on.
Slope Compensation Circuitry
To overcome subharmonic oscillations and instability
problems that exist with converters running in continuous
conduction mode (CCM) and when the duty cycle is close
or above 50 percent, the NCP1081 integrates a current slope
compensation circuit. The amplitude of the added slope
compensation is typically 110 mV over one cycle.
As an example, for an operating switching frequency of
250 kHz, the internal slope provided by the NCP1081 is
27.5 mV/ mA typically.
DCDC Controller Oscillator
The frequency is configured with the Rosc resistor
inserted between OSC and ARTN, and is defined by the
following equation:
R
OSC
(kW) +
38600
F
OSC
(kHz)
The duty cycle limit is fixed internally at 80 percent.
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