NCP4326 datasheet(19/30 Pages) ONSEMI

Part #	NCP4326

Description	Secondary Controller for Multi?뭀utput Quasi?뭃esonant Switchmode Power Supplies

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP4326

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19

Duty Cycle Control:

Figure 41 shows the duty cycle value according the opamp

output voltage (CPx pin):

1. If the opamp output (VCPx) is above the maximum

ramp value (VCt_max1) on “Ct” pin then the duty

cycle will be equal to 100%.

2. If VCPx is between the max and the min value of

the ramp voltage, respectively VCt_max1 and

VCt_min1 then the duty cycle will be included

between 0 and 100%.

3. If VCPx is below the min ramp value (VCt_min1)

then the output driver will be place in skip cycle

mode with a null duty cycle.

FB Voltage on pin CPx

Time

Figure 41. Duty Cycle Variation versus the

Feedback Voltage

VOH1, 2min

Duty Cycle = 100%

0% < Duty Cycle < 100%

Duty Cycle = 0%

VCt_max1

VCt_min

VCpx

Here after find the experimental results illustrating the skip cycle feature:

DRV2 pin Signal

(10 V/div)

Ct ramp pin signal

(1 V/div)

Error amplifier

output voltage (CP2

pin) (1 V/div).

Variable

Duty Cycle

100%

Duty Cycle

0% DC

Figure 42. All Duty Cycle Representation

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