SG6859ADZ datasheet(5/12 Pages) FAIRCHILD

Part #	SG6859ADZ

Description	Low-Cost, Green-Mode PWM Controller for Flyback Converters

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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SG6859A Rev. 1.0.0

5

Electrical Characteristics

Unless otherwise noted, VDD=15V and TA=25°C.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

VDD Section

VDD-OP

Continuously Operation Voltage

22

V

VDD-ON

Turn-on Threshold Voltage

15.5

16.5

17.5

V

VDD-OFF

Turn-off Threshold Voltage

8.5

9.5

10.5

V

IDD-ST

Startup Current

VDD=VDD-ON – 0.1V

9

15

μA

IDD-OP

Operating Supply Current

VDD=15V, CL=1nF

3.0

3.5

mA

VDD-OVP

VDD Over-voltage Protection Level

Auto Restart

24

25

26

V

tD-VDDOVP VDD Over-voltage Protection Debounce

Auto Restart

125

μs

VDD-G OFF

VDD Low-threshold Voltage to Exit

Green-off Mode

VDD-OFF

+ 1

V

Feedback Input Section

ZFB

Input Impedance

5

kΩ

VFB-OPEN FB Output High Voltage

5

V

VFB-OL

FB Open-loop Trigger Level

4.3

4.6

4.9

V

tD-OLP

Delay of FB Pin Open-loop Protection

56

ms

VFB-N

Green-Mode Entry FB Voltage

2.60

2.85

3.10

V

VFB-G

Green-Mode Ending FB Voltage

2.2

V

SG

Green-Mode Modulation Slope

RI=95kΩ

40

75

100

Hz/mV

Current-Sense Section

ZSENSE

Input Impedance

10

kΩ

tPD

Delay to Output

40

55

100

ns

VSTHFL

Flat Threshold Voltage for Current Limit

1

V

VSTHVA

Valley Threshold Voltage for Current Limit

0.75

0.80

0.85

V

tLEB

Leading-Edge Blanking Time

270

320

370

ns

DCYSAW Duty Cycle of SAW Limit

40

%

Oscillator Section

Center Frequency

65

70

75

FOSC

Frequency

Hopping Range

RI=95kΩ

±

4.9

kHz

THOP

Hopping Period

RI=95kΩ

3.7

ms

FOSC-G

Green-Mode Frequency

RI=95kΩ

20

kHz

FDV

Frequency Variation vs. VDD Deviation

VDD=13.5 to 22V

0

0.02

2.00

%

FDT

Frequency Variation vs. Temperature

Deviation

TA=-20 to 85°C

2

%

Output Section

DCYMAX Maximum Duty Cycle

62

67

72

%

VGATE-L

Output Voltage Low

VDD=15V, Io=20mA

1.4

V

VGATE-H

Output Voltage High

VDD=13.5V, Io=20mA

8

V

tr

Rising Time

VDD=15V, CL=1nF

150

ns

tf

Falling Time

VDD=15V, CL=1nF

55

ns

VGATE-

CLAMP

Output Clamp Voltage

VDD=22V

16

17

18

V

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