6742ML 查看數據表（PDF） - Fairchild Semiconductor

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6742ML

Highly Integrated Green-Mode PWM Controller

Fairchild Semiconductor 

Electrical Characteristics (Continued)

VDD=15V and 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

VFB-G

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

Green-Mode Ending FB Voltage

FB Pin Open

1/4.5 1/4.0 1/3.5 V/V

4

7 kΩ

5.2

V

4.6

4.8 5.0 V

50

56

62 ms

2.8

3.0 3.2 V

VFB-N-0.6

V

VFB-ZDC Zero Duty-Cycle Input Voltage

1.6

V

Current-Sense Section

ZSENSE Input Impedance

VSTHFL Current Limit Flatten Threshold Voltage

VSTHVA Current Limit Valley Threshold Voltage

VSTHFL–VSTHVA

tPD Delay to Output

tLEB Leading-Edge Blanking Time

VS-SCP Threshold Voltage for SENSE Short-Circuit Protection

tD-SSCP Delay Time for SENSE Short-Circuit Protection VSENSE<0.15V

tSS Period During Soft-Startup Time

Startup Time

GATE Section

12

KΩ

0.87 0.90 0.93 V

0.30 0.34 0.38 V

100 200 ns

100 150 200 ns

0.10 0.15 0.20 V

100 150 200 µs

5

ms

DCYMAX Maximum Duty Cycle

VGATE-L Gate Low Voltage

60

VDD=15V, IO=50mA

65

70 %

1.5 V

VGATE-H Gate High Voltage

VDD=12V, IO=50mA

8

V

tr

Gate Rising Time

VDD=15V, CL=1nF

150 250 350 ns

tf

Gate Falling Time

IGATE- Gate Source Current

SOURCE

VGATE- Gate Output Clamping Voltage

CLAMP

RT Section

VDD=15V, CL=1nF

30

50

90 ns

VDD=15V, GATE=6V 250

mA

VDD=22V

18 V

IRT Output Current from RT Pin

92

100 108 µA

VRTTH1

0.7V ＜ VRT ＜

1.05V, After 12ms

Over-Temperature Protection Threshold Voltage Latch Off

1.015 1.050 1.085 V

VRTTH2

VRT ＜ 0.7V, After

100µs Latch Off

0.65 0.70 0.75 V

tD-OTP1 Over-Temperature Latch-off Debounce

VRTTH2 ＜ VRT ＜

VRTTH1

8

12

16 ms

tD-OTP2

VRT< VRTTH2

40

100 160 µs

Over-Temperature Protection Section (OTP)

TOTP

TRestart

Protection Junction Temperature(3)

Restart Junction Temperature(4)

+135

°C

TOTP-25

°C

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

SG6742ML/MR • Rev. 1.0.4

6

www.fairchildsemi.com

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