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NCP81243 Datasheet(PDF) 22 Page - ON Semiconductor

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

NCP81243 Datasheet(HTML) 22 Page - ON Semiconductor

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NCP81243
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22
PWM Comparators
The noninverting input of the comparator for each phase
is connected to the summed output of the error amplifier
(COMP) and each phase current (IL*DCR*Phase Balance
Gain Factor). The inverting input is connected to the
oscillator ramp voltage with a 1.3 V offset. The operating
input voltage range of the comparators is from 0 V to 3.0 V
and the output of the comparator generates the PWM output.
During steady state operation, the duty cycle is centered
on the valley of the sawtooth ramp waveform. The steady
state duty cycle is still calculated by approximately
Vout/Vin. During a transient event, the controller will
operate in a hysteretic mode with the duty cycles pull in for
all phases as the error amp signal increases with respect to
all the ramps.
Phase Detection Sequence
Normally, NCP81243 operates as a 3−phase VCORE/
2−phase Auxiliary PWM controller however the NCP81243
can also be configures as a 4+1−phase controller. During
start−up, the number of operational phases and their phase
relationship is determined by the internal circuitry
monitoring the CSP outputs.
Configuration
Phase
Configuration
Programming Pin
Phase Config
(30 mv/us slew rate)
Programming Pin CSPx
Unused Pins
1
4+1
80k6
All CSP pins connected normally
2
4+0
80k6
Connect CSP1A to VCC through a 2 k
resistor. All other CSP pins connected
normally
Float:PWM1A, ILIMA,
DIFFOUTA,COMPA,CSCOMPA
Ground: IOUTA, FBA, CSSUMA,
CSREFA,VSPA, TsenseA
3
3+2
13k
All CSP pins connected normally
No unused pins
4
3+1
13k
Connect CSP2A to VCC through a 2k
resistor. All other CSP pins connected
normally
Float: PWM2A
5
3+0
13k
Connect CSP2A and CSP1A to VCC
through a 2k resistor. All other CSP
pins connected normally
Float: PWM2A, PWM1A, ILIMA,
DIFFOUTA, COMPA, CSCOMPA
Ground: IOUTA, FBA, CSSUMA,
CSREFA, VSPA, TsenseA
6
2+2
13k
Connect CSP3 to VCC through a 2k
resistor pulled to VCC. All other CSP
pins connected normally
Float: PWM3
7
2+1
13k
Connect CSP2A to VCC through a 2k
resistor. All other CSP pins connected
normally
Float PWM3, PWM2A
8
2+0
13K
Connect CSP3, CSP2A and CSP1A
to VCC through a 2k resistor. All other
CSP pins connected normally
Float PWM3, PWM1A, PWM2A,
PWM3ILIMA, DIFFOUTA,
COMPA, CSCOMPA Ground:
IOUTA, FBA, CSSUMA,
CSREFA, VSPA, TsenseA
9
1+2
13K
Connect CSP3 and CSP2 through a
2k resistor pulled to VCC. All other
CSP pins connected normally
Float: PWM2 and PWM3
10
1+1
13K
Connect CSP3, CSP2 and CSP2A
through a 2k resistor pulled to VCC.
All other CSP pins connected normally
Float: PWM2, PWM3, PWM2A
11
1+0
13K
Connect CSP3, CSP2, CSP2A and
CSP1A through a 2k resistor pulled to
VCC. All other CSP pins connected
normally
Float: PWM2, PWM3, PWM1A,
PWM2A, ILIMA, DIFFOUTA,
COMPA, CSCOMPA Ground:
IOUTA, FBA, CSSUMA,
CSREFA, VSPA, VSNA
The PWM outputs are logic−level devices intended for driving fast response external gate drivers such as the NCP81151 and
NCP81161. As each phase is monitored independently, operation approaching 100% duty cycle is possible. In addition, more
than one PWM output can be on at the same time to allow overlapping phases.


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