FAN302HLMY_F117 datasheet(11/18 Pages) FAIRCHILD

Teilenummer	FAN302HLMY_F117

Bauteilbeschribung	PWM Controller for Low Standby Power Battery-Charger Applications ??mWSaver??Technology

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Hersteller	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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FAN302HLMY_F117 • Rev. 1.0.1

11

P

PK

S

N

I

N

⋅

P K

I

D

AVG

O

II

<>

=

Figure 26. Key Waveforms of DCM Flyback

Converter

Figure 27. Detailed Waveform for ZCD

Frequency Reduction in CC Mode

An

important

design

consideration

is

that

the

transformer guarantee DCM operation across the whole

range since the output current is properly estimated only

in DCM operation. As can be seen in Figure 28, the

discharge time (tDIS) of the diode current increases as

the output voltage decreases in CC Mode. The

converter tends to go into CCM as output voltage drops

in CC Mode when operating at the fixed switching

frequency. To prevent this CCM operation while

maintaining good output current estimation in DCM,

FAN302HLMY_F117 decreases switching frequency as

output voltage drops, as shown in Figure 28 and Figure

29. FAN302HLMY_F117 indirectly monitors the output

voltage by the sample-and-hold voltage (VSH) of VS,

which is taken at 85% of diode current discharge time of

the previous switching cycle, as shown in Figure 27.

Figure 30 shows how the frequency reduces as the

sample-and-hold voltage of VS decreases.

Figure 28. tDIS Variation in CC Mode

Figure 29. Frequency Reduction with VSH

CC

G

S

V

f

−

=

Δ

Figure 30. Frequency Reduction Curve in

CC Regulation

Ähnliche Beschreibung - FAN302HLMY_F117

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
Fairchild Semiconductor	FAN302HLMY	1Mb / 18P	PWM Controller for Low Standby Power Battery- Charger Applications ??mWSaver??Technology
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Ähnliche Teilenummer - FAN302HLMY_F117

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