SG6741 Ver la hoja de datos (PDF) - Fairchild Semiconductor

Número de pieza

componentes Descripción

Fabricante

SG6741

Highly Integrated Green-Mode PWM Controller

Fairchild Semiconductor 

Electrical Characteristics (Continued)

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

Symbol

Parameter

Conditions

Min. Typ. Max. Units

Feedback Input Section

AV

ZFB

VFB-OPEN

VFB-OLP

tD-OLP

VFB-N

Input Voltage to Current-Sense Attenuation

Input Impedance

Output High Voltage

FB Open-Loop Trigger Level

Delay Time of FB Pin Open-Loop Protection

Green-Mode Entry FB Voltage

VFB-G Green-Mode Ending FB Voltage

FB Pin Open

RI=26kΩ

1/3.75 1/3.20 1/2.75 V/V

4

7

kΩ

5.5

V

3.7

4.0

4.3

V

50

56

62 ms

1.9

2.1

2.3

V

VFB-N-

0.5

V

VFB-ZDC Zero Duty-Cycle Input Voltage

VFB-G - VFB-G - VFB-G -

V

0.25 0.20 0.10

Current-Sense Section

ZSENSE Input Impedance

12

KΩ

VSTHFL Current Limit Flatten Threshold Voltage

0.87 0.90 0.93 V

VSTHVA Current Limit Valley Threshold Voltage

VSTHFL–VSTHVA

0.30 0.34 0.38 V

tPD Delay to Output

100 200 ns

tLEB Leading-Edge Blanking Time

275 350 425 ns

VS-SCP Threshold Voltage for SENSE Short-Circuit Protection

0.15

V

tD-SSCP

Delay Time for SENSE Short-Circuit

Protection

VSENSE<0.15V, RI=26kΩ

180

µs

GATE Section

DCYMAX Maximum Duty Cycle

VGATE-L Gate Low Voltage

VDD=15V, IO=50mA

70

75

80

%

1.5

V

VGATE-H Gate High Voltage

VDD=12.5V, IO=50mA

8

V

tr

Gate Rising Time

VDD=15V, CL=1nF

150 250 350 ns

tf

Gate Falling Time

VDD=15V, CL=1nF

30

50

90 ns

IGATE- Gate Source Current

SOURCE

VDD=15V, GATE=6V

250

mA

VGATE- Gate Output Clamping Voltage

CLAMP

VDD=22V

18

V

Notes:

3. When activated, the output is disabled and the latch is turned off.

4. The threshold temperature for enabling the output again and resetting the latch after OTP has been activated.

© 2008 Fairchild Semiconductor Corporation

SG6741 • Rev. 1.3.3

6

www.fairchildsemi.com

Share Link: