NCP1611
http://onsemi.com
20
Figure 60. DeadTime Generation
Top:
CrM operation when the current information exceeds the preset level during the demagnetization phase
Middle:
the circuit restarts at the next valley if the sum (ramp + current information) exceeds the preset level during the deadtime, while
the drainsource voltage is high
Bottom:
the sum (ramp + current information) exceeds the preset level while during the deadtime, the drainsource voltage is low. The
circuit skips the current valley and restarts at the following one.
Current Information Generation
The FFcontrol pin sources a current that is
representative of the input current. In practice, I
pin3
is built
by multiplying the internal control signal (V
REGUL
, i.e., the
internal signal that controls the ontime) by the sense
voltage (pin 2) that is proportional to the input voltage. The
multiplier gain (K
m
of Figure 61) is three times less in
highline conditions (that is when the LLine signal from
the brownout block is in low state) so that I
pin3
provides a
voltage representative of the input current across resistor
R
FF
placed between pin 3 and ground. Pin 3 voltage is the
current information.
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