FAN6793NY datasheet(8/19 Pages) FAIRCHILD

No de pièce	FAN6793NY

Description	Highly Integrated, Dual-PWM Combination Controller

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Fabricant	FAIRCHILD [Fairchild Semiconductor]

Site Internet	http://www.fairchildsemi.com

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FAN6791 / FAN6793 • Rev. 1.0.2

8

Electrical Characteristics

VDD=18V; RI=24kΩ;TA =25°C, unless noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

ON/OFF

RON/OFF

Impedance ON/OFF Pin

50

100

kΩ

VON

High Threshold Level of

Synchronizing Signal

2.4

3.0

3.6

V

VOFF

Low Threshold Level of

Synchronizing Signal

0.8

1.0

1.2

V

Over Temperature Protection (OTP)

TOff

Protection Junction

Temperature

(1)

130

140

+150

°C

TRestart

Restart Junction Temperature

(2)

100

110

+120

°C

Flyback PWM Stage

FBFYB Feedback Input

AV-FLY

FB Input to Current Comparator

Attenuation

1/3.75

1/3.20

1/2.75

V/V

ZFB

Input Impedance

4

5

7

kΩ

VHGH

Output High Voltage

FB Pin Open

5.0

5.2

V

VFB-OLP

FB Open-Loop Trigger Level

4.2

4.5

4.8

V

tOLP

FB Open-Loop Protection Delay

53

56

59

ms

VN

Green Mode Entry FB Voltage

2.4

2.5

2.6

V

SG

Slope of Green-Mode Modulation

60

75

90

Hz/mV

VG

Green Mode Ending FB Voltage

1.8

1.9

2.0

V

VOZ-OFYB

VFBPWM for Zero Duty Cycle

(Forward Turn On)

1.2

1.3

1.4

V

IFYB Current Sense

ZCS

Input Impedance

12

kΩ

VLIMIT1

Peak Current Limit Threshold

Voltage 1

VRMS=1V

0.75

0.80

0.85

V

VLIMIT2

Peak Current Limit Threshold

Voltage 2

VRMS=1.5V

VLIMIT1 -0.1

V

tPD

Propagation Delay to GATE

Output

VDD=15V, OFYB Drops

to 9V

60

120

ns

tBNK

Leading-Edge Blanking Time

200

270

350

ns

ΔVSLOPE

Slope Compensation

Duty=DCYMAX

0.34

0.37

0.41

V

VS-SCP

Threshold Voltage for SENSE

Short-Circuit Protection

0.1

0.15

0.2

V

tD-SSCP

Delay Time for SENSE Short-

Circuit Protection

VSENSE<0.15V,

RI=24KΩ

100

180

240

µs

OFYB-GATE Driver

VOFYB-CLAMP

Flyback PWM Gate Output

Clamping Voltage

VDD=22V

16

18

V

VOL-OFYB

Output Voltage Low

VDD=15V; IO=20mA

1.5

V

VOH-OFYB

Output Voltage High

VDD=12V; IO=20mA

8

V

tR-OFYB

Rising Time

VDD=15V; Gate=1nF;

Gate=2~9V

30

60

120

ns

tF-OFYB

Falling Time

VDD=15V; Gate=1nF;

Gate=9~2V

30

50

90

ns

DCYMAX-OFYB Maximum Duty Cycle

60

65

70

%

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