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NCP81243 Datasheet(PDF) 21 Page - ON Semiconductor

Part No. NCP81243
Description  Dual Output 3 & 2 Phase Controller
Download  26 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP81243 Datasheet(HTML) 21 Page - ON Semiconductor

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NCP81243
www.onsemi.com
21
Rcomp2
8.2K
RNTC
100K
Cfilter
0.1uF
AGND
AGND
Rcomp1
0.0
TSENSE
Precision Oscillator
A programmable precision oscillator is provided. The
clock oscillator serves as the master clock to the ramp
generator circuit. This oscillator is programmed by a resistor
to ground on the ROSC pin. The oscillator frequency range
is between 300 KHz/phase to 1.4 MHz/phase. The ROSC
pin provides approximately 2 V out and the source current
is mirrored into the internal ramp oscillator. The oscillator
frequency is approximately proportional to the current
flowing in the ROSC resistor.
Figure 7. NCP81243 Operating Frequency vs. Rosc
The oscillator generates triangle ramps that are 1.3~2.5 V
in amplitude depending on the VRMP pin voltage to provide
input voltage feed forward compensation. The ramps are
equally spaced out of phase with respect to each other and
the signal phase rail is set half way between phases 1 and 2
of the multi phase rail for minimum input ripple current.
For use with On Semiconductors phase doubler the
NCP81243 offers the user the ability to double the frequency
of each rail independently or simultaneously. This will allow
the rail that is being doubled to maintain a higher system
switching frequency.
Programming the Ramp Feed−Forward Circuit
The ramp generator circuit provides the ramp used by the
PWM comparators. The ramp generator provides voltage
feed−forward control by varying the ramp magnitude with
respect to the VRMP pin voltage. The VRMP pin also has
a 4V UVLO function. The VRMP UVLO is only active after
the controller is enabled. The VRMP pin is high impedance
input when the controller is disabled.
The PWM ramp time is changed according to the
following,
V
RAMPpk
+pk
PP
+ 0.1 @ V
VRMP
Vin
Comp −IL
Duty
Vramp _pp


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